BROOKFIELD M19-2101 DVNext Rheometer Instruction Manual

: June 16, 2024
: BROOKFIELD

M19-2101 DVNext Rheometer

Product Information

Specifications

Model: DVNext Rheometer
Manual Revision: 2.0 (M19-2101)

Introduction

The DVNext Rheometer is a high-quality device developed by
AMETEK Brookfield for measuring viscosity and yield of various
substances. This operational manual provides detailed instructions
on how to use the rheometer effectively.

Getting Started

Powering Up

To power up the DVNext Rheometer, follow these steps:

Ensure the device is connected to a power source.
Press the power button located on the control panel.

Digital Leveling

To ensure accurate measurements, perform digital leveling using
the following steps:

Activate the digital leveling function on the device.
Follow the on-screen instructions to level the device.

AutoZero

The AutoZero feature allows for automatic zeroing of the
rheometer. To use AutoZero:

Access the navigation menu on the device.
Select the AutoZero option.
Follow the on-screen prompts to complete the process.

The DVNext Rheometer features a user-friendly navigation system.
Use the control panel or touch screen to navigate through different
options and settings.

Home Screen

The home screen provides an overview of the device’s status and
options. It displays essential information such as temperature,
viscosity, and yield measurements.

Out-of-Range

If the measurements are out of range, the device will display a
notification. Take appropriate action to ensure accurate
readings.

Printing

The DVNext Rheometer supports printing functionality. Connect a
compatible printer to the device and follow the on-screen
instructions to print measurement results.

Making Viscosity Measurements

To measure viscosity using the DVNext Rheometer, follow these
steps:

Temperature Control

The device allows for precise temperature control during
viscosity measurements. Follow these steps:

Making Yield Measurements

The DVNext Rheometer can also measure yield of substances. To
make yield measurements:

Settings

Device Setup

Configure the device settings according to your
requirements:

User Settings

Customize user-specific settings on the DVNext Rheometer:

Administrator Account and Admin Functions

Access administrator functions and manage the device using the
administrator account:

Frequently Asked Questions (FAQ)

Q: Can I reproduce or transmit this manual without

permission?

No, you cannot reproduce or transmit this manual in any form or
by any means without the express written permission of AMETEK
Brookfield.

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PROPRIETARY RIGHTS NOTICE
This manual contains valuable information and material developed by AMETEK Brookfield for use with the DVNext Rheometer. No part of this manual can be reproduced or transmitted in any form or by any means, electronic, mechanical or otherwise. This includes photocopying and recording or in connection
with any information storage or retrieval system without the express written permission of AMETEK Brookfield.
ALL RIGHTS RESERVED

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Table of Contents
1. INTRODUCTION ………………………………………………………………………………………………………………………. 6
1.1 Components……………………………………………………………………………………………………………………………………………….7 1.2 Utilities ……………………………………………………………………………………………………………………………………………………..10 1.3 Specifications………………………………………………………………………………………………………………………………………….10 1.4 Installation…………………………………………………………………………………………………………………………………………………11 1.5 Safety symbols and precautions ………………………………………………………………………………………………………….12 1.6 Key functions …………………………………………………………………………………………………………………………………………..12 1.7 Cleaning ……………………………………………………………………………………………………………………………………………………14
2. GETTING STARTED ………………………………………………………………………………………………………………. 15
2.1 Powering up ……………………………………………………………………………………………………………………………………………..15 2.2 Digital leveling…………………………………………………………………………………………………………………………………………15
2.2.1 AutoZero…………………………………………………………………………………………………………………………………………………………………………………………………. 16
2.3 Navigation ………………………………………………………………………………………………………………………………………………. 17 2.4 Home Screen ………………………………………………………………………………………………………………………………………….18
2.4.1 Viscosity Wizard …………………………………………………………………………………………………………………………………………………………………………………… 19 2.4.2 Configure viscosity test…………………………………………………………………………………………………………………………………………………………………….. 21 2.4.3 Configure yield test …………………………………………………………………………………………………………………………………………………………………………… 23 2.4.4 Load test ………………………………………………………………………………………………………………………………………………………………………………………………. 25 2.4.5 View results …………………………………………………………………………………………………………………………………………………………………………………………. 26
2.5 Out-of-range………………………………………………………………………………………………………………………………………….. 26 2.6 Printing …………………………………………………………………………………………………………………………………………………… 26
3. MAKING VISCOSITY MEASUREMENTS …………………………………………………………………………….28
3.1 Quick start………………………………………………………………………………………………………………………………………………. 28 3.2 Preparations for making measurements ………………………………………………………………………………………….. 28 3.3 Programming………………………………………………………………………………………………………………………………………….29 3.4 Selecting a spindle/speed……………………………………………………………………………………………………………………30 3.5 Attaching a spindle to the magnetic coupling …………………………………………………………………………………. 32 3.7 Barcode scanner……………………………………………………………………………………………………………………………………33
3.7.1 Scanning non-cone/plate spindles with the barcode scanner (C & G models) …………………………………………………………………. 33 3.7.2 Scanning cone/plate spindles ………………………………………………………………………………………………………………………………………………………… 35 3.7.3 Scanning cone/plate spindles, attached to the DVNext………………………………………………………………………………………………………….. 36 3.7.4 Scanning sample barcodes (standard & compliant instruments) …………………………………………………………………………………………..37 3.7.5 Scanning accessory barcodes (compliant instruments only) ………………………………………………………………………………………………….37
3.8 Temperature control……………………………………………………………………………………………………………………………..38

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3.9 Multiple data points …………………………………………………………………………………………………………………………… 39 3.10 Selecting data collection ………………………………………………………………………………………………………………… 39 3.11 End condition types …………………………………………………………………………………………………………………………… 41 3.12 Additional test parameters ……………………………………………………………………………………………………………… 42 3.13 Running a test …………………………………………………………………………………………………………………………………… 44 3.14 Results ……………………………………………………………………………………………………………………………………………….. 46
4. MAKING YIELD MEASUREMENTS ……………………………………………………………………51
4.1 Quick start…………………………………………………………………………………………………………………………………………….. 51 4.2 Preparations for making measurements ………………………………………………………………………………………… 51 4.3 Selecting a spindle/speed………………………………………………………………………………………………………………… 52 4.4 Temperature control………………………………………………………………………………………………………………………….. 53 4.5 Test parameters…………………………………………………………………………………………………………………………………. 54 4.6 Running a Yield Test………………………………………………………………………………………………………………………….. 56
5. SETTINGS……………………………………………………………………………………………………………………………..60
5.1 Device setup…………………………………………………………………………………………………………………………………………60 5.2 User settings ………………………………………………………………………………………………………………………………………. 63 5.4 Administrator account and admin functions …………………………………………………………………………………. 68
5.4.1 Scanning accessory barcodes (compliant instruments only) ……………………………………………………………………………………………….68 5.4.2 Log in and lock out (compliant instruments only)……………………………………………………………………………………………………………………70 5.4.3 Electronic signatures (compliant instruments only) ………………………………………………………………………………………………………………..71 5.4.4 Users and access (compliant instruments only) ………………………………………………………………………………………………………………………71 5.4.5 Set Time and Date ………………………………………………………………………………………………………………………………………………………………………….. 74 5.4.6 Manage data …………………………………………………………………………………………………………………………………………………………………………………….. 74 5.4.7 Default path ………………………………………………………………………………………………………………………………………………………………………………………. 75 5.4.8 Settings reset ……………………………………………………………………………………………………………………………………………………………………………………76 5.4.9 Device reset ………………………………………………………………………………………………………………………………………………………………………………………76 5.4.10 Calibration Reminder……………………………………………………………………………………………………………………………………………………………………..76 5.4.11 Torque filtering…………………………………………………………………………………………………………………………………………………………………………………. 77
5.5 21 CFR Part 11 compliance (compliant instruments only)……………………………………………………………..77 6.1 The Power Law (Ostwald) model……………………………………………………………………………………………………… 80 6.2 The Herschel-Bulkley model …………………………………………………………………………………………………………….. 81 6.3 The Bingham model…………………………………………………………………………………………………………………………… 82 6.4. The Casson model ……………………………………………………………………………………………………………………………. 83 6.5 Other rheological models ………………………………………………………………………………………………………………… 84 6.6 The IPC Paste Model…………………………………………………………………………………………………………………………. 85
APPENDIX A – CONE/PLATE RHEOMETER SET UP ………………………………………………………… 87
A.1 Electronic gap setting features………………………………………………………………………………………………………… 87

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A.2 Set-up………………………………………………………………………………………………………………………………………………….. 88 A.3 Set-up………………………………………………………………………………………………………………………………………………….. 89 A.4 Verifying calibration …………………………………………………………………………………………………………………………..90
APPENDIX B – VISCOSITY RANGES …………………………………………………………………………………….. 91 APPENDIX C – VARIABLES IN VISCOSITY MEASUREMENTS………………………………………… 95 APPENDIX D – SPINDLE ENTRY CODES AND SMC/SRC VALUES………………………………… 97 APPENDIX E – SPINDLE ENTRY CODES AND RANGE COEFFICIENTS ……………………… 103 APPENDIX F – CALIBRATION PROCEDURES…………………………………………………………………… 105 APPENDIX G – THE AMETEK BROOKFIELD GUARD LEG……………………………………………….. 111 APPENDIX H – AUTOMATIC OSCILLATION CHECK ………………………………………………………… 113 APPENDIX I – FTP SERVER CONNECTION SPECIFICATION …………………………………………. 115
Part a: Hardware configuration……………………………………………………………………………………………………………… 115 Part b: FileZilla FTP server …………………………………………………………………………………………………………………….. 118 Part c: Create FTP home directory and any sub-directories ……………………………………………………. ……..124 Part d: User(s) with access to the FTP home directory …………………………………………………………………….125 Part e: Temporarily turn off Firewall/security preferences ………………………………………………………………. 131 Part f: Determine IP address of the FTP server ………………………………………………………………………………… 134 Part g: Setup FTP folder on the device with corresponding credentials ………………………………………..135 Part h: Log on to FTP server on the PC………………………………………………………………………………………………..137 Part i: Exporting result files…………………………………………………………………………………………………………………… 139 Quick setup guide……………………………………………………………………………………………………………………………………. 141
APPENDIX J – SPEED SELECTION …………………………………………………………………………………….. 143 APPENDIX K – LABORATORY STANDS……………………………………………………………………………… 144 APPENDIX L – DVE 50-A PROBE CLIP ………………………………………………………………………………..147 APPENDIX M – SCREEN PROTECTOR ………………………………………………………………………………. 148 APPENDIX N – FAULT DIAGNOSIS AND TROUBLESHOOTING…………………………………….. 150 APPENDIX O – INSTRUMENT DIMENSIONS ………………………………………………………………………152 APPENDIX P – ONLINE HELP AND ADDITIONAL RESOURCES ……………………………………..153 APPENDIX Q – WARRANTY REPAIR AND SERVICE ……………………………………………………….. 154

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1. INTRODUCTION
AMETEK Brookfield has been the world leader in viscosity measurement instruments for over 85 years.The DVNext Rheometer is AMETEK Brookfield’s latest model that incorporates new advanced features that our customers have been asking for with the repeatability and reliability you expect from us.

Standard Version
· Digital Leveling · Ethernet Connectivity · Start-up Wizard · Gel-Timer Functionality · Optional Magnetic Coupling Attachment
(replaces EZ-lock) · Optional Barcode Scanner

Compliant Version
· Hand-held Scanner for Barcode Detection · Accessory Detection with Barcode Detection · Magnetic Coupling Attachment (replaces EZ-
Lock) · Compliance to 21 CFR 11 in Stand-alone and
GAMP Compliant · LIMS Connectivity · Printing to non-editable PDF

The AMETEK Brookfield DVNext Rheometer measures fluid viscosity at given shear rates. Viscosity is a measure of a fluid’s resistance to flow. You will find a detailed description of the science of viscosity in the AMETEK Brookfield publication “More Solutions to Sticky Problems”.
This manual covers the DVNext Rheometer. The DVNext offers exceptional versatility in modes of control, allowing choice of traditional standalone operation and automatic operation through programs downloaded from the PC or with complete control by PC using AMETEK Brookfield RheocalcT Software.

· The DVNext can be used as a traditional AMETEK Brookfield rheometer for collection of single speed viscosity data through the easy-to-use touch screen; just select the spindle and speed and read the value from the display. [See Section 2: Getting Started] · The DVNext can collect multiple data points through programs created directly on the touch-screen display.
· The DVNext can make a direct measurement of yield stress when using optional vane spindles.
· The AMETEK Brookfield RheocalcT Software will perform all control and data collection functions of the DVNext from the PC while also providing a platform for advanced data collection and analysis.

In any of these modes of control, the DVNext will provide the best in viscosity measurement and control. The principal of operation of the DVNext is to drive a spindle (which is immersed in the test fluid) through a calibrated spring. The viscous drag of the fluid against the spindle is measured by the spring deflection. Spring deflection is measured with a rotary transducer. The measurement range of a DVNext (in centipoise or milliPascal·seconds) is determined by the rotational speed of the spindle, the size and shape of the spindle, the container the spindle is rotating in, and the full-scale torque of the calibrated spring.
There are four basic spring torque series offered by AMETEK Brookfield:

Model
DVNEXT LV DVNEXT RV DVNEXT HA DVNEXT HB

Spring Torque dyne·cm dyn·cm 673.7 7,187.0 14,374.0 57,469.0

milliNewton·m mN·m 0.0673 0.7187 1.4374 5.7469

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The higher the torque calibration, the higher the measurement range. The measurement range for each torque calibration is found in Appendix B.
All units of measurement are displayed according to either the CGS system or the SI system.
· Viscosity appears in units of centipoise (cP), Poise (P), milliPascal- seconds (mPa·s) or Pascal-seconds (Pa·s) on the DVNext Rheometer display or centistokes (cSt) or millimeter squared per second (mm²/sec).
· Shear Stress appears in units of dynes/square centimeter (D/cm²) or Newtons/square meter (N/m²)/or Pascals (Pa).
· Shear Rate appears in units of reciprocal seconds (1/sec). · Torque appears in units of dyne-centimeters or Newton-meters (shown as percent “%” in both cases) on
the DVNext Rheometer display. · Density appears in units of grams/cubic centimeter (g/cm³) or kilograms/cubic meter (kg/m³).
Note: To change CGS to SI units on the display (see section 5.3: Global Settings)
The equivalent units of measurement in the SI system are calculated using the following conversions:

Viscosity:
Shear Stress: Torque:

SI 1mpa.s 1n/m2
1N.m

CGS 1cp 10dyn/cm2
107dyn.cm

References to viscosity throughout this manual are done in CGS units. The DVNext Rheometer provides equivalent information in SI units.

1.1 Components
Please check to be sure that you have received all components, and that there is no damage. If you are missing any parts, please notify AMETEK Brookfield or your local authorized dealer. Any shipping damage must be reported to the carrier.

Components

Part Number

DVNext Rheometer
Laboratory Stand Model G Lab Stand Model QB Lab Stand (Optional)
Spindle Set with Case* DVNext LV set of four spindles DVNext RV set of six spindles (#2 – #7) DVNext HA/HB set of six spindles (#2 – #7)

varies
MODEL G MODEL QB
varies SSL or SSLM SSR or SSRM SSH or SSHM

Quantity Standard Version 1 1
1

Compliant Version 1 1
1

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For Cone/Plate versions:

Threaded coupling: a spindle wrench (SP-23), one cone spindle (CPA-XXZ or CPA- XXCZ), a sample cup (CPA44YZ) replace the spindle set.

Magnetic coupling: one cone spindle (CPM-XXZ or CPM-XXCZ) and a sample cup (CPA-44YZ) replace the spindle set.

Power Cord

varies

RTD Temperature Probe

DVP-94Y

Guard Leg DVNext LV DVNext RV

varies

B-20Y*

B-21Y*

GV-3531*

GV-3532*

Carrying Case

GV-1302Y

RheocalcT Software (Optional)

varies

Standard

SWL-01-111

Advanced

SWL-01-211

Shipping Cap

varies

Screen Protector

GV-1020

Barcode Scanner (Optional for

GV-1412

Standard Version)

4 GB Flash Drive (Includes Manual

MFD-DVNX

M19-2101)

Not supplied with Cone/Plate version. “M” in the part number identifies magnetic spindles.

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Component Diagram

Figure 1-1

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1.2 Utilities
Input Voltage: Input Frequency: Power Consumption: Fuse: Power Cord Color Code:

Universal Power Supply (90 – 260 VAC) 50/60 Hz 150 VA 5 x 20mm 4A time delay

Hot (live) Neutral Ground (Earth)

United States Black White Green

Outside United States Brown Blue Green/Yellow

Main supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage.

1.3 Specifications

Speed: Weight:
Carton Volume: Carton Dimensions: Temperature Sensing Range:

0.01 – 250 RPM Gross Weight: 26 lbs.; 11.8 kg. Net Weight: 22 lbs.; 10.0 kg. 2.48 cu. ft.; 0.07 m3 21 in. (53 cm) W x 12 in. (30 cm) L x 17 in. (43 cm) H -100°C to 300°C (-148°F to 572°F) ±1.0% of Full-Scale Range

USB B port for use with an attached PC USB A port (x3) for use with a USB Flash Drive and Dymo Printer RJ45 Ethernet port for network connection

Viscosity Accuracy: Viscosity Repeatability: Temperature Accuracy: Operating Environment: Electrical Certification:

The use of accessory items will have an effect on the measurement accuracy. See Appendix B ±0.2% of Full-Scale Range ±1°C | -100°C to +149°C ±2°C | +150°C to +300°C 0°C to 40°C temperature range (32°F to 104°F)20% – 80% R.H.: non- condensing atmosphere Conforms to CE Standards: BSEN 61326-1:2013: Electrical equipment for measurement, control and laboratory use – EMC requirements. BSEN 61010-1:2010: Safety requirements for electrical equipment, for measurement, control, and laboratory use. BSEN IEC 63000:2018: Technical documentation for the assessment of electrical and electronic products with respect to the restriction of hazardous substances (ROHS 3).

Ball Bearing Option
If you ordered the ball bearing suspension system with your new instrument, please note the following:
· The ball bearing suspension in your AMETEK Brookfield instrument is noted on the serial tag on the back of the head by the letter “B” in the part number (the ninth digit; for example: XDVNTHBTBG0U00.
· When attaching and detaching the spindle, it is not necessary to lift the coupling where the spindle

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connects to the instrument. · The Oscillation Check, explained in Section V.1: Device Setup, does not pertain to this instrument.
Notice to customer:
This symbol indicates that this product is to be recycled at an appropriate collection center.
Users within the European Union: Please contact your dealer or the local authorities in charge of waste management on how to dispose of this product properly. All AMETEK Brookfield offices and our network of representatives and dealers can be found on our website: www.brookfieldengineering.com.
Users outside of the European Union: Please dispose of this product according to your local laws.
1.4 Installation
· Assemble the Model G Laboratory Stand (refer to assembly instructions in Appendix I)
· Note: IQ, OQ, PQ, an abbreviated guideline document for installation, operation and performance
validation for your DVNext digital rheometer is available for purchase from AMETEK Brookfield or your local authorized dealer. · Put the rheometer on the stand. · Connect the RTD probe to the socket on the rear panel of the DVNext. · The rheometer must be leveled. Follow the instructions on the screen. · Remove the shipping cap which secures the coupling nut on the rheometer to the pivot cup. For Cone/ Plate Models, hold the Sample Cup and swing the tension bar away from the bottom of the cup. Lower the cup and remove the foam insert (Save for future shipments). · Install the screen protector per the instructions on the package (and also shown in Appendix M). Failure to properly install the screen protector may result in touch screen malfunction. Additional installation help can also be found on our YouTube channel: www.youtube.com/user/brookfieldEng.
The AC input voltage and frequency must be within the appropriate range as shown on the name plate of the viscometer (see Section I.2).
Make sure that the AC power switch at the rear of the DVNext is in the OFF position. Connect the power cord to the socket on the back panel of the instrument and plug it into the appropriate AC line.
The AC input voltage and frequency must be within the appropriate range as shown on the name plate of the rheometer.
· Turn the power switch to the ON position and allow the rheometer to warm up for 10 minutes before performing autozero.
· For Cone/Plate models, refer to Appendix A. · If appropriate, connect USB type A to USB type B cable (DVP-202 or user supplied) to USB port for
connection of DVNext to PC or printer.

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Figure 1-2
1.5 Safety symbols and precautions
Safety Symbols: The following explains safety symbols which may be found in this operating manual.
Indicates hazardous voltages may be present. Refer to the manual for specific warning or caution information to avoid personal injury or damage to the instrument.
Precautions:
If this instrument is used in a manner not specified by the manufacturer, the protection provided by the instrument may be impaired.
This instrument is not intended for use in a potentially hazardous environment. In case of emergency, turn off the instrument and then disconnect the electrical cord from the wall outlet. The user should ensure that the substances placed under test do not release poisonous, toxic or flammable gases at the temperatures which they are subjected to during the testing. The safety of any system incorporating this equipment is the responsibility of the assembler of the system.

1.6 Key functions

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The DVNext Rheometer utilizes a touch screen display and interface. The user will provide all input to the rheometer through the touch screen. Figure I-3 details the different types of information and actions available.

Status Bar Title Bar Test Name Data Fields More/Less Bar Command Keys

Figure 1-3
The Status Bar provides information relating to the date and time (as configured by the user) and various connections to the DVNext Rheometer.
The Title Bar identifies the activity to be conducted in the current view and includes any navigation icons that are relevant.
The Test Name identifies the name of the currently loaded test.
The Data Fields include measurement results and test parameters.
The More/Less Bar informs the user when more Data Fields are available and when the number of Data Fields can be reduced.
The Command Keys indicate action that can be taken. These keys will vary from view to view depending on what actions are relevant.

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1.7 Cleaning
Make sure that the instrument is in a clean, dry working environment (dust free, moderate temperature, low humidity, etc.).
Make sure the instrument is on a level surface. Hands/fingers must be clean and free of sample residue. Not doing so may result in deposit build up on the upper part of the shaft and cause interference between the shaft and the pivot cup. Be sure to remove the spindle from the instrument prior to cleaning. Note left-handed thread. Severe instrument damage may result if the spindle is cleaned in place.

When cleaning, do not apply excessive force, which may result in bending spindles.

Instrument and Display:

Clean with a dry, non-abrasive cloth. Do not use solvents or cleaners. The instrument housing is manufactured from polycarbonate ABS. Clean Instrument housing with mild soap and water. Do not apply solvent to the instrument!

Immersed Components (spindles): Spindles are made of stainless steel. Clean with a non-abrasive cloth and solvent appropriate for sample material.

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2. GETTING STARTED
2.1 Powering up
The DVNext will go through a Power Up sequence when the power is turned on. The Rheometer will issue a beep, present a blue screen, and finally show the DVNext About screen for 5 seconds. The About screen is shown below and includes several critical parameters about the rheometer including; rheometer torque (LV, RV, HA, HB, or other), firmware version number, model number (DVNext LV, for example) and the serial number.
The About screen can also be accessed through the Settings Menu (see Section V.1).
The DVNext Rheometer will automatically transition from the About screen to the AutoZero screen.
TIP: When contacting AMETEK Brookfield or your local authorized dealer for technical support or repair services, please record the information on the About screen and include this detail in your email.

Figure 2-1
2.2 Digital leveling
Upon powering up the DVNext, the user will be prompted to level the DVNext device, if not already level. To level the DVNext, adjust the leveling screws on the base. When the device is not level, the centering dot will be red. While adjusting to a level position, the dot will become yellow, signifying that the device is approaching a position where it will be level. Once the dot is within specified limits of the center circle, the dot will turn green to signify that the DVNext is now level and ready to operate (see Figure II-2). Following this process, the device will then move onto the autozero function (Section II.2). For compliant DVNext devices, the Administrator can prevent other users from skipping the leveling popup. When this occurs, the user will not be able to skip/ignore the popup warning as the option will be grayed out. This option is only available to Compliant Edition devices and is not available on Standard Edition devices.

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Figure 2-2
2.2.1 AutoZero
The DVNext Rheometer must perform an AutoZero prior to making viscosity measurements. This process sets the zero reading for the measurement system. The AutoZero will be performed every time the instrument is turned on. Additionally, you may perform an AutoZero at any time through the Settings Menu (see Section V.1).
The AutoZero screen will be presented automatically, after the About screen, during a power up.
The operator must ensure that the rheometer is level (see Section I.4) and remove any attached spindle or coupling. When the Next button is pressed, the rheometer will operate for approximately 13 seconds. After the AutoZero is complete and the operator presses the Next button, the rheometer will transition to the Configure Viscosity Test screen. If the AutoZero was performed from the Settings Menu, then the rheometer will return to the Settings Menu.
TIP: For instruments with Magnetic Coupling System, keep spindle end and other magnetic materials 1-inch away from the coupling during autozero.
TIP: Do not touch the rheometer during the AutoZero process to ensure the best zero value.

Figure 2-3

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The DVNext Rheometer will display a status bar at the top of the screen at all times.

This status bar will indicate the following: time of day, date, and connection status for a variety of connection devices. The status icons are defined as:

USB Icon 1, 2, 3:

The DVNext Rheometer can store data and tests to USB storage device (USB B) such as a USB Flash Drive. There are three USB ports. These ports are represented as 1, 2 and 3 based on the order of connection.

Printer Icon:

The DVNext Rheometer can communicate to a label printer for printing test results.

Computer Icon:

The DVNext Rheometer can communicate with a computer through the USB B port. Communication is supported with AMETEK Brookfield RheocalcT software.

Bath Icon:

The DVNext Rheometer can communicate with a AMETEK Brookfield Thermosel (HT-106 Controller) or Temperature Bath (SD or AP Controllers) to control sample temperature.

Temperature Probe Icon:

The DVNext Rheometer can read the temperature probe sensor and shows the icon when the probe is plugged in.

Ethernet

The DVNext Rheometer can connect to a Network.

2.3 Navigation
The DVNext Rheometer uses a touch screen display. Navigation of the instrument features is done using a variety of Data Fields, Arrows, Command Keys and Navigation Icons. The operating system has been designed for intuitive operation and employs color to assist the user in identifying options.
Data Fields require that the user touch the screen to initiate the data entry/ selection process. These fields are normally outlined in black. They may also include a blue arrow. Blue Arrows indicate that options exist for a Data Field. The user may be required to press anywhere in the Data Field or they may have to press the Blue Arrow specifically. Command Keys are buttons which direct the DVNext to perform a specific action such as SAVE a data set or STOP a program. Command Keys are presented in a variety of colors. These keys are normally found at the bottom of the screen.

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Navigation Icons are normally found in the Title Bar to the left and right. These buttons will take you to specific areas of the operating system.

Home Menu
Log In (will only be available if the administrator has activated user log in) Settings Menu
Service Menu (only available for authorized AMETEK Brookfield service centers) Lock Out (during a test)
Remove Lock (during a test)
Perform data entry using a number pad

Perform data entry from a scroll list Sort files according to create date Sort files according to alphabet Choose from additional options Back (return to previous screen) Up (return to previous level in the file structure)

2.4 Home Screen
The DVNext Home screen can be accessed by using the Home Icon. The Home screen shows the Main Menu functions and provides access to the following as shown in Figure 2-4.

Configure viscosity test : Configure yield test : Load test :
View results :
Manage files :

Create and run viscosity tests.
Create and run yield tests.
Load a test that has previously been saved. Tests may be loaded from internal memory or a USB Flash Drive.
Load Results (saved test data) that have previously been saved. Results may be loaded from internal memory or a USB Flash Drive.
Manage the file system in the internal memory or on a USB Flash Drive for test programs and saved data. Create new folder structures, delete files, rename files and move files.

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External mode :

Direct the DVNext to communicate with AMETEK Brookfield RheocalcT Software for complete rheometer control.

Viscosity wizard :

The Viscosity Wizard will provide a step-by-step guide to setup and run a test.

Each of the Main Menu items are detailed in the following sections of the manual.

2.4.1 Viscosity Wizard
The DVNext can help determine the test parameters for a viscosity test via the Viscosity Wizard. The Viscosity Wizard provides a step-by-step guide to setup and run a test. Accessing the viscosity Wizard can be done from the Main Menu screen (see Figure 2-5).
Upon selecting the Viscosity Wizard, the DVNext will display two options to estimate the viscosity. The first option is to select an example fluid that is like the intended test sample. The example fluids can be selected from a preset menu that includes: Water, Olive Oil, Shampoo, Honey, Molasses, and Non-Flowing (see Figure 2-6). If Non-Flowing is selected, the DVNext will display a prompt for the user to contact AMETEK Brookfield to discuss options for measuring the viscosity of non-flowing materials (see Figure 2-7). The second option is to input the approximate viscosity for the intended test sample (see Figure 2-8).

Figure 2-5

Figure 2-6

Figure 2-7

Figure 2-8

Regardless of whether the first or second option is selected, when the next key is pressed,the “Choose Spindle” screen will appear (see Figure 2-9).

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Choose Spindle: There are two options for spindle selection. The first option is that the Wizard will recommend the spindle to use, which is shown by the blue arrow in the figure below (see Figure 2-9). The second option will allow a spindle to be selected by manually entering the spindle code as shown via the yellow arrow (see Figure 2-9).
The DVNext will alert the user that the device will run a test to determine the optimal measurement parameters (see Figure 2-10). If OK is selected, the DVNext will prompt the user to setup the sample and recommended spindle (see Figure 2-11).

Figure 2-9

Figure 2-10

If OK is selected, the DVNext will then begin the first attempt at optimizing the speed & spindle combination. In order to evaluate the spindle/speed combination, the DVNext will run a viscosity test at a standard RPM with a torque stabilization end condition with a tolerance of +/- 0.5% and a one- minute time period for the stabilization. The goal of the Viscosity Wizard is to obtain the torque reading between 20% and 80%. Depending on the setup, the time to complete the Viscosity Wizard test could be up to five minutes.
If the Viscosity Wizard obtained a torque measurement between 20-80%, the DVNext will display the “Wizard Complete” screen (see Figure 2-12). The Wizard Complete screen will provide the user the optimal spindle and speed for the sample tested. This screen will also give the user the run time that the wizard took in order to arrive at that conclusion.

Figure 2-11

Figure 2-12

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When OK is pressed, the configure viscosity screen will be populated with the recommended parameters from the Viscosity Wizard. If the Viscosity Wizard was unable to obtain a torque between 20% and 80%, the device will adjust the speed. In some cases, the device may recommend switching to a different spindle (see Figure 2-13).
If the Viscosity Wizard is not able to obtain torque measurements within 20-80%, the “Please Contact AMETEK Brookfield” screen will be displayed (see Figure 2-14).

Figure 2-13

Figure 2-14

2.4.2 Configure viscosity test
If the user does not wish to use the Viscosity Wizard, the Configure Viscosity Test function can be used. The Configure Viscosity Test is shown at the conclusion of the AutoZero function or by selection on the Home Menu All elements related to the measurement of viscosity are selected within Configure Viscosity Test. Tests that are created can be saved to the internal memory of the DVNext Rheometer or onto a connected USB Flash Drive. Tests can be loaded from memory by selecting Load Test from the Home Screen. Many aspects of Configure Viscosity Test can be limited when User ID and Log In functions are implemented (see Section V.4.2). The basic Configure Viscosity Test view is shown in Figure 2-15. This view includes the Status Bar, Title Bar (which includes the Home and Settings icons), test name, test parameters, the More/Less bar, and Command Keys.
The user can see the name of any test that has been loaded through the Load Test function. In Figure 2-15, the file name is listed as Unsaved Test, indicating that the current test has not been saved.
The More/Less bar is seen just below the test parameters. In Figure 2-15, this bar includes a down arrow, which indicates that more information is available. Figure 2-16 shows the additional information that can be accessed. The More/Less bar in this view has an up arrow indicating that the additional information can be hidden.
The Command Keys include Clear, Save and Run.

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Figure 2-15

Clear: Save: Run:

Figure 2-16
Clear all data that has been entered into the test parameters and restore the values to the factorydefault. Save the current test.
Run the current test.

Test Parameter area includes many elements of the viscosity test as well as live measurements of Torque % and Temperature. Temperature data will only be displayed if a AMETEK Brookfield temperature probe is connected to the DVNext Rheometer.

Torque:

A live signal from the rheometer.

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Spindle:

The currently selected spindle. All viscosity, shear rate, and shear stress calculations will be made based on this spindle. The spindle number may be changed by pressing the blue arrow.

Speed:

The currently selected speed of rotation. The rheometer will operate at this speed once the RUN command key is pressed. The speed may be changed by pressing the blue arrow.

Temperature:

A live signal from the rheometer when a temperature probe is attached (AMETEK Brookfield part number DVP-94Y orSC4-61Y).

End Condition: Specify the condition that will end the test. Data- Collection: Specify the amount of data to be collected during a test.

Instructions: Reports: QC Limits:

Create a message that the user will see when the test begins. Define how the data will be viewed when the test is complete. Define the limits for acceptable measurement data.

Density:

Define the density of the test sample. This information will be used when kinematic viscosity units are selected for display (see Section V.4.2)

2.4.3 Configure yield test
Yield measurements are made on the DVNext Rheometer through the Configure Yield Test function. The user can select Configure Yield Test from the Home Menu.
All elements related to the measurement of yield are selected within Configure Yield Test. Tests that are created can be saved to the internal memory of the DVNext Rheometer or onto a connected USB Flash Drive. Tests can be loaded from memory by selecting Load Test from the Home Screen.
TIP: Many aspects of configure Yield Test can be limited when User ID and Log In functions are implemented for compliant editions.
The basic Configure Yield Test view is shown in Figure 2-17. This view includes the Status Bar, Title Bar (which includes the Home and Settings icons), test name, test parameters, the More/Less bar, and Command Keys.
The user can see the name of any test that has been loaded thorough the Load Test function. In Figure 2-6, the file name is listed as Unsaved Test, indicating that the current test has not been saved. The More/Less bar is seen just below the test parameters.
In Figure 2-17, the bar includes a down arrow, which indicates that more information is available. Figure 2-18 shows the additional information that can be accessed. The More/Less bar in this view now has an up arrow indicating that the additional information can be hidden.

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Figure 2-17

Clear: Save: Run:

Figure 2-18
Clear all data that has been entered into the test parameters and restore the values to the factory default. Save the current test.
Run the current test.

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The test parameter area includes many elements of the yield test as well as live measurement of temperature. Temperature data will only be displayed if a AMETEK Brookfield temperature probe is connected to the DVNext Rheometer.

Spindle:
Immersion Mark:
Pre-Shear Speed: Time: Zero:
Wait Time: Run Speed: Torque Reduction: Temperature:
Yield Limit: Instructions: Save Path:

The currently selected spindle. All Yield and Stress calculations will be made based on the Spindle selection and the Immersion Mark. Spindle choice is limited to vane spindles or user defined custom spindles. Specify the immersion location of the AMETEK Brookfield vane spindle. Primary is at the immersion mark shown on the spindle shaft. Secondary is at the mid-point of the vane surface (see Section IV.5). Specify a speed of rotation for Pre-Shear of the sample. Pre-Shear Specify the duration of the Pre-Shear step.
Specify the speed of rotation used to return the %Torque reading to zero before starting the yield measurement. Specify the duration of a rest period prior to starting the yield test.
Specify the speed of the yield test.
Specify the end point of the test. Normally set to 100%.
A live signal from the rheometer when a temperature probe is attached (AMETEK Brookfield Part No. DVP-94Y). Also shown is the set point used to control the attached temperature controller (AMETEK Brookfield Thermosel or TC-XX0SD / TC- XX0AP Temperature Baths). Define the limits for acceptable measurement data.
Create a message that the user will see when the test begins.
Define the memory location where the data will be saved.

2.4.4 Load test

Test programs that are created (Configure Viscosity Test/Configure Yield Test) can be saved to the internal memory of the DVNext or to a USB Flash Drive. These files can bere loaded into the DVNext for immediate use through the Load Test function. A file that is placed onto a USB Flash Drive can be loaded onto any DVNext Rheometer.

Within the Load Test function, the user can access the internal memory of the rheometeror any USB Flash Drive that

is connected to a USB port .

The rheometer will point to the USB Flash Drive according to the order in which it

is connected. The first USB Flash Drive that is connected will be referred to as #1 on both the Load Test screens and

the Status Bar. As many as three USB Flash Drives can be connected to the DVNext at any time.

Test files that are displayed on the screen can be sorted by date of creation or by alpha/numeric. This sorting is selected by pressing the Navigation Icon or.

TIP: Manage Files function can be used to move Test files from internal memory to a USB Flash Drive.

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2.4.5 View results

Test results (data files) can be saved to the internal memory of the DVNext or to a USB Flash Drive. These files can be reloaded into the DVNext for review, analysis, or printing through the View Results function. A file of Test Results that is saved onto a USB Flash Drive can be viewed on any DVNext Rheometer.

Within the View Results function, the user can access the internal memory of the DVNext Rheometer or any USB

Flash Drive that is connected to a USB port

. The rheometer will point to the USB Flash Drive according to the

order in which it is connected. The first USB Flash Drive that is connected will be referred to as #1 on both the View

Results screen and the Status Bar. As many as three USB Flash Drives can be connected to the DVNext at any time.

Results files that are displayed on the screen can be sorted by date of creation or by alpha/numeric name. This

sorting is selected by pressing the Navigation Icon

TIP: Manage Files function can be used to move Results files from internal memory to a USB Flash Drive.

2.5 Out-of-range
The DVNext Rheometer will give on screen indications when the measurement is out of range of the instrument. When the %Torque reading exceeds 100% (over range), the display of %Torque, Viscosity, and Shear Stress will be EEEE (see Figure 2-20). If the %Torque value is between 0 – 9.9%, the data field label will flash. When the %Torque is below zero (negative values), the display of Viscosity and shear Stress will be —-.
TIP: AMETEK Brookfield recommends collecting data only when the %Torque reading is between 10 – 100%.

Figure 2-20
Measurement data should not be collected when the %Torque reading is out of range. The out of range condition can be resolved by either changing the speed (reduce speed when reading is out of range: high) or changing the spindle (increase the spindle size when the reading is out of range: low).
TIP: When comparing data, the test method is critical. Be sure that you know the proper spindle and speed required for the test method. If readings are out of range, this condition should be reported as the test result.

2.6 Printing
The DVNext Rheometer can communicate to a Dymo Label Writer 450 Turbo label printer. This printer can be purchased from AMETEK Brookfield (Part No. GV-1046). The communication to the printer is by USB (cable provided with the printer). When the printer is connected to the DVNext, the printer icon will be visible in

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the status bar.
There is no provision currently to have other drivers for other printers work with the DVNext. The DVNext Rheometer can configure the printout for several formats of paper/labels.These various paper/label stocks are available from AMETEK Brookfield. (see Figure 2-21)

Label Type
Data label, small (1.13 X 3.5 in.)
Data label, large (2.31 X 4 in.)
Continuous paper (2.25 in. wide)

Part Number – Standard GV-1048 GV-1049 GV-1047

Part Number – Long Life (7 yr.) GV-1082 GV-1083 GV-1081

Printer formats are detailed below: Data Label (small)

Figure 2-21 Data Label (large)

TIP: When printing to a label, if the data set includes more than one point, only the last point will be printed. Data Continuous

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3. MAKING VISCOSITY MEASUREMENTS
3.1 Quick start
The DVNext Rheometer uses the same methodology for viscosity measurements as previous AMETEK Brookfield instruments. If you have experience with other AMETEK Brookfield equipment, this section will give you quick steps for taking a viscosity reading. If you have not used a AMETEK Brookfield Rheometer before, skip this section and go to Section 4.2 for a detailed description.
· Assemble DVNext Rheometer (Section 2-2). · Turn power on. · There will be a prompt to level the DVNext, if not already level. Follow instructions on screen. (Section 2.2) · Autozero the rheometer (Section 2.2.1). · The DVNext will display the Configure Viscosity Test Screen. In this screen, select spindle and speed.
Confirm that Data Collection is set to Single Point and End Condition is set to Time 00:00:00. · Attach the spindle to the coupling nut.
· Note: Left-hand thread. If equipped with magnetic coupling, use the appropriate procedure to connect
the spindle (see Section 3.5). · Immerse the spindle gently into the test sample by lowering the DVNext on the Model G laboratory stand. · Press the Run button. The screen will change to the Running Viscosity Test Screen. · When ready to record the measurement results, press the Stop Test button. The screen will change to the
Results Table. Record the % torque and viscosity. · To run another test, press Configure Test. To return to the Home Menu, press the Home Icon.
3.2 Preparations for making measurements
· RHEOMETER: The DVNext should be turned on, leveled and autozeroed. The level is adjusted using the two feet on the bottom of the base and confirmed through aligning the digital bubble on the screen with the center of the leveling circle. Adjust the feet until the bubble is inside the center target. Set the level prior to autozero. The proper level is essential for correct operation of the DVNext.
· SAMPLE: The fluid to be measured (sample) must be in a container. The standard spindles supplied with the DVNext [LV (1-4), RV (2-7), or HA/HB (2-7)] are designed to be used with a 600 mL low form Griffin beaker (or equivalent container with a diameter of 8.25 cm). The same applies to the optional RV1, HA/ HB1, and Vane spindles. Many other spindle systems are supplied from AMETEK Brookfield with specific sample chambers such as the Small Sample Adapter, UL Adapter and Thermosel.
AMETEK Brookfield recommends that you use the appropriate container for the selected spindle. You may choose an alternate container for convenience; however, this may influence the measured viscosity. The DVNext is calibrated considering the specified container.
Alternate containers will provide results that are repeatable but may not be “true”. The LV (1-4) and RV (1-7) are designed to be used with the guard leg attached. Measurements made without the guard leg will provide repeatable results but may not provide “true” results.
When comparing data, be sure to specify the sample container and presence/absence of the guard leg.
Many samples must be controlled to a specific temperature for viscosity measurement. When conditioning a sample for temperature, be sure to temperature control the container and spindle as well as the sample.
Please see our publication, “More Solutions to Sticky Problems”, for more detail relating to sample preparation.

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3.3 Programming
The DVNext Rheometer provides a powerful programming capability for data collection. The interface in Configure Viscosity Test allows for control of all instrument parameters including Spindle, Speed, Temperature (optional), End Condition, Data Collection, Instructions, Reports, Density, and QC Limits (described in the next sections of this chapter). Any collection of these parameters is considered a Test Step. The DVNext allows you to create multiple steps to better evaluate your sample material. Several parameters are only active in the first step including Spindle and Instructions.
Multiple steps in a Test can be useful to evaluate the rheology of a sample or to simply aid in data collection. A multistep Test that has a change in speed in each step can show Newtonian or non-Newtonian flow behavior. A first step with No Data can be useful when pre shearing is required. A step with No Data can be useful when a temperature change is affected, and some time is required for thermal equilibrium.
The Configure Viscosity Test screen (see Figure 2I-1) includes several tools for creating Tests with multiple steps.

Figure 3-1

Navigation / Add:
Delete:
Insert:

Use the to add a new step at the end of the Test. Use the to navigate to previous steps. Delete the current step.
Insert a new step after the current step.

Two multi-step Tests are shown below. The first Test shows a three-step Test where each step has a different speed with a single data point collection. The results will include three viscosity points, one for each speed. The second Test shows a two-step Test where the first step is a pre-shear step. The pre- shear is conducted at 200 RPM for one minute and no data is collected.
The second step generates a single data point.

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Three-step Test:

Figure 3-2a:step 1 Two-step Test:

Figure 3-2a:step 2

Figure 3-2a:step 3

Figure 3-3a:step 1

Figure 3-3a:step 2

3.4 Selecting a spindle/speed
The DVNext has the capability of measuring viscosity over an extremely wide range. For example, the DVNext RV can measure fluids within the range of 100-40,000,000 cP. This range is achieved by using several spindles over many speeds. See Appendix B for details.

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The process of selecting a spindle and speed for an unknown fluid is normally trial and error. An appropriate selection will result in measurements made between 10-100 on the instrument % torque scale. There are two general rules that will help in the trial and error process:
· Viscosity range is inversely proportional to the size of the spindle. · Viscosity range is inversely proportional to the rotational speed.
In other words: to measure high viscosity, choose a small spindle and/or a slow speed. If the chosen spindle/speed results in a reading above 100%, then reduce the speed or choose a smaller spindle.
Experimentation may reveal that several spindle/speed combinations will produce satisfactory results between 10-100%. When this circumstance occurs, any of the spindles may be selected.
Non-Newtonian fluid behavior can result in the measured viscosity and yield stress changing if the spindle and/or speed is changed. See our publication, “More Solutions toSticky Problems”, for more details.
When viscosity data must be compared, be sure to use the same test methodology: namely the same instrument, spindle, speed, container, temperature and test time.
DVNext LV Rheometers are provided with a set of four spindles and a narrow guard leg; DVNext RV Rheometers come with a set of six spindles and a wider guard leg; DVNextHA and DVNext HB Rheometers come with a set of six spindles and no guard leg. (See Appendix G for more information on the guard leg.)
The spindles are attached to the rheometer by screwing them onto the coupling nut on the lower shaft (see Figure 2I-4). Note that the spindles have a left- hand thread. The lower shaft should be secured and slightly lifted with one hand while screwing the spindle to the left. The face of the spindle nut and the matching surface on the lower shaft should be smooth and clean to prevent eccentric rotation of the spindle. Spindles can be identified by the number on the side of the spindle coupling nut.

Figure 3-4 Figure 3-5

The motor should be OFF whenever spindles are being removed or attached.

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3.5 Attaching a spindle to the magnetic coupling
Align two opposing spindle slots (see Figure 3-6) with the two pins inside the coupling (see Figure 3-7).

Figure 3-6

Figure 3-7

Carefully insert the spindle into the coupling so the slots are fully engaged with the pins. You should feel the pull of the magnet as the spindle seats in the coupling.

When properly aligned, there should be no gap between the spindle and the coupling (see Figures 3-8 and 3-9).

Figure 3-8: No Gap, Correct

Figure 3-9: Gap, Not Correct

3.6 Removing a spindle from the magnetic coupling
· With the motor turned OFF, carefully grasp the spindle shaft (see Figure 2I-10). and pivot it sideways to separate it from the magnetic coupling (see Figure 2I-11). DO NOT PULL DOWN ON THE SPINDLE!!
· Gently lift the Spindle just enough to minimize any pressure on the pivot point and jewel inside the DVNext. · While still lifting, gently push the Spindle to the side like a pendulum to disengage it from the magnetic
coupling. The spindle and coupling should separate easily. If they do not separate easily, DO NOT FORCE IT. Stop and try pushing it in a different direction. · Continue pushing the spindle in an unrestrictive direction until it is completely detached from the magnetic coupling.

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Figure 2I-10

Figure 2I-11

3.7 Barcode scanner
Set-Up the Zebra DS4308-HD (recommended) Digital Barcode Scanner for First Time Use:
Plug the barcode scanner into one of the USB-A Ports on the back panel of the DVNX. Wait for the barcode scanner to beep.
Scan the ADD AN ENTER KEY (Carriage Return/Line Feed) Barcode on the SET DEFAULTS/ENTER KEY BARCODES page of the Barcode Scanner Manual (see Figure 3-12).
Your Barcode Scanner is now ready for use with AMETEK Brookfield DVNext Viscometers and Accessories.

Figure 3-12
3.7.1 Scanning non-cone/plate spindles with the barcode scanner (C & G models) Plug the barcode scanner into one of the USB-A Ports on the back panel of the DVNext (see Figure 3-13). Wait for the barcode scanner to beep.

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Figure 3-13
On the Configure Viscosity Test screen, touch the Blue Arrow in the Spindle field (see Figure 3-14) to open Set Spindle (see Figure 3-15).

Figure 3-14

Figure 3-15

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Attach the Spindle to the DVNX magnetic coupling (see Figures 3-16 and 17).

Figure 3-16

Figure 3-17

Hold the barcode scanner approximately 3-5 inches from the spindle at a slight upward angle of 10-20°. Aim the barcode scanners red dot at the spindle barcode (see Figure 3-18).
Squeeze the barcode scanner trigger until it beeps and the Spindle field on the DVNext screen populates (see Figure 3-19). Verify the correct spindle and serial number were scanned.

Figure 3-18

Figure 3-19

3.7.2 Scanning cone/plate spindles
Plug the barcode scanner into one of the USB ports on the back panel of the DVNext. Wait for the barcode scanner to beep. On the Configure Viscosity Test screen, touch the blue arrow in the Spindle field to open Set Spindle. Place the Cone/Plate Spindle on a clean, flat surface (see Figures 3-20 and 21).

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Figure 3-20

Figure 3-21

Hold the barcode scanner at a 20-30° downward angle, approximately 3-6 inches from the spindle (see Figure 3-22). Aim the barcode scanner’s red dot at the spindle barcode (see Figure 3-23). Squeeze the barcode scanner trigger until it beeps and the Spindle field on the DVNext screen populates. Verify the correct Spindle number was scanned.

Figure 3-22

Figure 3-23

3.7.3 Scanning cone/plate spindles, attached to the DVNext
Plug the barcode scanner into one of the USB Ports on the back panel of the DVNext. Wait for the barcode scanner to beep. On the Configure Viscosity Test screen, touch the Blue Arrow in the Spindle field to open Set Spindle. Locate the barcode on the Cone/Plate Spindle (see Figure 3-24).
Hold the barcode scanner at a 0-10° angle, approximately 3-5 inches from the spindle. Aim the barcode scanners red dot at the spindle barcode. Squeeze the barcode scanner trigger until it beeps and the Spindle field on the DVNext screen populates (see Figure 3-25). Verify the correct spindle number was scanned.

Figure 3-24

Figure 3-25

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3.7.4 Scanning sample barcodes (standard & compliant instruments)
Plug the barcode scanner into one of the USB Ports on the back panel of the DVNext. Wait for the barcode scanner to beep. On the Configure Viscosity Test screen, touch the Blue Arrow (see Figure 3-26) in the Sample ID field to open the Enter Sample ID screen (see Figure 3-27).

Figure 3-26

Figure 3-27

Hold the barcode scanner approximately 4-6 inches from your sample barcode. Aim the barcode scanner red dot at the sample barcode (see Figure 3-28). Squeeze the barcode scanner trigger until it beeps and the Sample ID field on the DVNX screen populates (seeFigure 3-29). Verify the correct sample number was scanned.

Figure 3-28

Figure 3-29

3.7.5 Scanning accessory barcodes (compliant instruments only)
Plug the barcode scanner into one of the USB Ports on the back panel of the DVNext. Wait for the barcode scanner to beep. On the Configure Viscosity Test screen touch the blue arrow in the accessory field to open the Set Accessory screen (see Figure 3-30).
Hold the barcode scanner approximately 3-6 inches from the accessory barcode angled left or right at 0-20°. Aim the barcode scanner red dot at the accessory barcode. Squeeze the barcode scanner trigger until it beeps and the Accessory field on the DVNX screen populates (see Figure 3-31). Verify the correct sample number was scanned. Examples of some accessories is shown in Figure 3-32 and Figure 3-33.

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Figure 3-30

Figure 3-31

Figure 3-32: ULA

Figure 3-33: RV Guard Leg

3.8 Temperature control
The DVNext Rheometer provides the ability to control the temperature of a connected AMETEK Brookfield temperature control device such as the Thermosel (HT-106 controller) and water baths with SD or AP controllers (for example: TC-550SD). The Thermosel or waterbath can then be used to control the temperature of the sample under test.
The DVNext connects to the temperature control device through a dedicated communication cable. The Thermosel requires cable DVP-141. The water baths require cable DVP-207. These cables are available from AMETEK Brookfield.
When configured for control of a temperature control device, the DVNext may have two temperature inputs:
· The temperature probe supplied with the DVNext (DVP-94Y, CPA-44PYZ, or SC4-13RPY) · The temperature probe supplied with the temperature control device (water bath or Thermosel)
Only one temperature probe can be used for display of live temperature, control, and data collection. Select the probe to be used in the Temperature menu (see Figure 3-34). Temperature control must be initiated each time the DVNext is powered on. Be sure that the temperature control device is powered on prior to initiating communication. Choose Device Setup in the Settings menu. Choose Temperature and the Temperature menu will appear (see Figure 3-35). Temperature Offset is described in Section 4.4.

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Figure 3-34

Figure 3-35

Select Temperature Controller and you will be presented with the Default Temperature menu (see Figure 3-35). This menu allows the user to 1) initiate communication with the temperature controller and 2) set a default temperature.

Initiate temperature control by pressing the Test Connection. The connection status will be confirmed with a message box and the appearance of the bath icon in the status bar (see Section 2.3).

The Default Temperature is the temperature value that the control device will return to at the conclusion of a Test. This value is set only if the check box is checked. When the check box is unchecked, the temperature controller will hold at the last set point used in the Test.

TIP: When a test involves several temperature set points, set the Default Temperature to the first set point used in the Test. This will reduce the transition time from one Test run to the next Test run.

Note that temperature controllers can also be controlled through the RheocalcT software when they are connected to the computer using the proper cable. The Thermosel requires the HT-106 cable (RS-232), available from AMETEK Brookfield. The water bath requires the 225-173 cable (RS-232), which comes with the bath.

3.9 Multiple data points
Most of the viscosity and yield stress measurements are made at the quality control level and often consist of a single data point. The test is conducted with one spindle at one speed. The data point is a useful benchmark for the go/nogo decision in a production setting. The DVNext can be used for single point measurement.
Many fluids exhibit a characteristic change in viscosity and yield stress with a change in applied force. This nonNewtonian flow behavior is commonly seen in paints, coatings, and food products as a decrease in viscosity as shear rate increases or an increase in yield stress as a rotational speed increases. This behavior cannot be detected or evaluated with the single point measurement.
Non-Newtonian flow is analyzed through the collection of viscosity data over a range of shear rates and the generation of a graph of viscosity versus shear rate (a rheogram). This information will allow for a more complete characterization of a fluid and may help in formulation and production of a product. The DVNext is capable of collecting multiple data points for comprehensive analysis of flow behavior.
More information on flow behavior, shear rate and rheograms is available in our publication, “More Solutions to Sticky Problems”.

3.10 Selecting data collection
The DVNext Rheometer offers several options for data collection. The Data Collection setting is shown in Configure

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Viscosity Test directly under the Temperature display. The factory setting is Single Point (see Figure 3-36). Pressing the blue arrow, in this field, will present the Data Collection screen (see Figure 3-37).

Figure 3-36

Figure 3-37

Single point Collect only a single data point when the End Condition is met.
Single point averaging Specify an amount of time over which to average measured data. Collect a single datapoint when the End Condition is met. This data point is an averaged value. If the time for averaging is shorter than the total time for the step, then the average will be performed for the specified time at the end of the test.

Example 1:

The End Condition is Time with a value of 1 minute and 30 seconds, the Single Point Averaging Duration is 30 seconds, the single data point collected from this step will be an average of the data measured from 1 minute to 1 minute 30 seconds.

Multi-point Collect multiple data points based on time. The Data Interval is specified in Hours: Mins:-Secs. If the End Condition is set to Time, then the total number of points will be calculated and displayed in the Data Collection screen. If the End Condition is not based on time, then it is possible that the step will conclude prior to a data point being collected. If you want a data point at the conclusion of the step regardless of the time interval, you can check the check box in the Data Interval screen.

Example 2: End Condition is Time = 2 minutes, Multi Point Data Interval is 10 seconds. Total points collected will be 12 with the last data point taken in the last second of the step.

Example 3:

End Condition is set to Viscosity = 200 cP, Multi Point Data Interval is 10 seconds. During the test the total time required to reach 200 cP is 65 seconds. Total points collected will be 6 with the last data point taken at 60 seconds, 5 seconds before the test is finished.

Example 4:

End Condition is set to Viscosity = 200 cP, Multi Point Data Interval is 10 seconds. Check the check box to Also Collect Single Point at Step End. During the test, the total time required to reach 200 cP is 65 seconds. Total points collected will be 7 with the last data point.

Multi-point averaging Specify an amount of time over which to average measured data. Collect multiple data points based on time until the End Condition is met. Each data point is an averaged value. If the Averaging Duration is shorter than the Data Interval for the step, then the average will be performed for the specified time at the end of the Data Interval. The

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total number of points to be collected will be displayed if the End Condition is set to Time. If the End Condition is not based on time, then it is possible that the step will conclude prior to a data point being collected. If you want a data point at the conclusion of the step regardless of the time interval, you can check the check box in the Data Interval screen.

Example 5:

End Condition is Time = 2 minutes, Multi Point Data Interval is 10 seconds. Averaging Duration is 5 seconds. Total points collected will be 12 with the last data point taken in the last second of the step. Each data point will be an average of the data measured in the last 5 seconds of each Data Interval.

Example 6:

End Condition is set to Viscosity = 200 cP, Multi Point Data Interval is 10 seconds. Averaging Duration is 5 seconds. During the test, the total time required to reach 200 cP is 63 seconds. Total points collected will be 6 with the last data point taken at 60 seconds, 3 seconds before the test is finished. Each data point will be an average of the data measured in the last 5 seconds of each Data Interval.

Example 7:

End Condition is set to Viscosity = 200 cP, Multi Point Data Interval is 10 seconds. Averaging Duration is 5 seconds. Check the check box to Also Collect Single Point at Step End. During the test, the total time required to reach 200 cP is 65 seconds. Total points collected will be 7 with the last data point taken at 65 seconds, an average of the 5 seconds after point #6.

Example 8:

End Condition is set to Viscosity = 200 cP, Multi Point Data Interval is 1 minute. Averaging Duration is 20 seconds. Check the check box to Also Collect Single Point at Step End. During the test, the total time required to reach 200 cP is 10 minutes 40 seconds. Total points collected will be 11 with the last data point taken at 10 minutes 40 seconds, an average of the last 20 seconds of the step.

No data End Condition is met and no data is collected.

3.11 End condition types
The DVNext comes available with a “type” parameter for some end conditions that allow the user to evaluate results a variety of different ways. These “type” parameters are applicable to the viscosity, torque, and temperature end conditions and are as follows: Equal to, Greater than, Less than, Stabilization, and Peak Exotherm (Temperature end condition ONLY). These parameters can be selected from the “type” dropdown menu in the end condition screen once the end condition selected is torque, viscosity, or temperature (see Figure 3-38).

Figure 3-38
Equal to The test will complete or move onto the next step once the specified end condition parameter (viscosity, torque, or temperature) measured by the device is equal to the value that is set by the user. The “Equal To” end condition can also be set up to have a tolerance. If the value measured reaches within the tolerance set for the value set,

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the end condition will be met and the DVNext will end the test or move onto the next step, depending on the test parameters.
Greater than The test will complete or move onto the next step once the specified end condition parameter (viscosity, torque, or temperature) measured by the device is greater than the value that is set by the user. The device will not end the test/ move onto the next step whilst the value measured is less than the value set by the user. The greater than type does not have a tolerance option.
Less than The test will complete or move onto the next step once the specified end condition parameter (viscosity, torque, or temperature) measured by the device is lower than the value that is set by the user. The device will not end the test/ move onto the next step whilst the value measured is greater than the value set by the user. The less than type does not have a tolerance option.
Stabilization The test will complete or move onto the next step once the specified end condition parameter (viscosity, torque, or temperature) measured by the device has stabilized. The DVNext provides the ability to set both the time period and a tolerance for the stabilization end condition. The time period is a set length of time that the user would like the value to stabilize over before the device deems the stabilization as successful. The time period can be set with the maximum time allowed at 30:59. The max and min values of the tolerance and the units is dependent on what value is being evaluated using the stabilization end condition. For temperature, the value is +/- 9.9 °C. For torque, the value is +/- 9.9 %. For viscosity the value is +/- 1.000E+10 cP.
Peak exotherm This option is available only to the temperature end condition parameter. The only value that can be set for this end condition is the tolerance (+/- °C). When using this end condition, the DVNext will deem the test complete or move onto the next step once the temperature peaks and then drops by the tolerance set as the end condition.
3.12 Additional test parameters
The Configure Viscosity Test screen includes a More/Less Bar. When pressed, the More Bar will present several additional Test Parameters including: QC Limits, Instructions, Reports, and Density. These parameters are always available and active regardless of the position of the More/Less Bar.
QC limits Select an acceptable range for measurement results. The range may be defined by Viscosity, Torque, Time, Temperature, or Shear Stress. The possible range for Viscosity and Shear Stress will be defined by the spindle and speed selected. QC Limits are a visual and audible signal to the operator during the test. The data set does not include an indication of QC Limits violation.
A violation of the QC Limits during the test will be indicated by a flashing yellow box around the display for the specified parameter. Note that Time does not have a dedicated display. A violation will result in an audible beep and a warning message (see Figure 3-39). Data will continue to be collected while the warning message is displayed. If Viscosity or Torque are the selected for QC Limits, QC Limits will be shown during the test on the Real Time Graph if that parameter is selected for display (see Figure 3-40). The QC Limits are represented by dashed lines.
TIP: Audible alarms may be turned off in the User Settings.
TIP: An indication of a QC Limit violation is not part of the data set. The user can record a violation by using the Notes available when viewing test Results (see Section 3.9).

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Figure 3-39

Figure 3-40

Figure 3-41

Instructions Record specific instructions to the operator. This information will be presented immediately when the program is Run (see Figure 3-41). The operator is required to acknowledge the message before the program will continue.
TIP: If the operator selects “Do not show this message again” within the Instructions message box, then Instructions will no longer be displayed for any test. This condition can be reset to allow Instructions to be displayed in the Display section of User Setting.
TIP: Instructions can be viewed during the test by selecting instructions (more/less bar) in the View Test screen.
Reports Define how data will be presented at the conclusion of the test and specify the path for saving data files. Upon the conclusion of a test, the user can be presented with either: a Graph, Table, Math Model, or an Average of collected data points. Once in the Results section, the down arrow can be used to change the view.
Post Test Averaging can be specified as either Test Averaging or Step Averaging. Test Averaging allows you to select which step from the program (created with PG Flash) is to be averaged and displayed. Step Averaging is used when there is a single test step. See Section 3.11 for more detail relating to Data Averaging.
The data path for saving data can be preselected as part of the test report.
TIP: Selecting a data path can help to organize data storage in the internal memory of DVNext. By preselecting the data path, operators are directed to put data from specific tests into specific areas.
TIP: If you select a data path that includes a USB Flash Drive location and the USB Flash Drive has been removed, an error message will be displayed.

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Density Input a density value for the sample to be tested. This value will be used to calculate viscosity when kinematic viscosity units have been chosen for display (see Section V.3).
3.13 Running a test
A viscosity test is started by pressing the Run button on the Configure Viscosity Test screen. When Run is pressed, the display will change to the Running Viscosity Test screen (see Figure 3-42). The Running Viscosity Test screen provides information on the current measurement including: Torque, Viscosity, Shear Stress, Shear Rate, Temperature and Speed.

Figure 3-42
Torque Torque is the deflection of the Rheometer torque sensor. It is described as a percent (%)and has a range of 0100%. The DVNext will provide measurement results within the stated accuracy provided the Torque reading is between 10100%. If the Torque reading falls below 10% the labels in the data fields will flash to indicate an error condition. AMETEK Brookfield does not recommend that data be collected below 10% Torque; however, data collection is not restricted.
TIP: Torque on the DVNext is equivalent to the dial reading from the AMETEK Brookfield Dial Reading Viscometer or the % reading from AMETEK Brookfield Digital Viscometers (DV-E, DV-I, DV-II, DV-III).
Viscosity Viscosity is calculated from the measured Torque based on the selected spindle and speed of rotation. The units of viscosity are defined in the Global Settings section of the Settings Menu. If the Torque reading falls below 10%, the labels in the data fields will flash to indicate an error condition.
Shear Stress Shear Stress is calculated from the measured Torque based on the selected spindle. The units of shear stress are defined in the Global Settings section of the Settings Menu. If the Torque reading falls below 10%, the labels in the data fields will flash to indicate an error condition.
TIP: Shear Stress will be displayed as zero for spindles that do not have SRC values.
Shear Rate Shear Rate is calculated from the selected speed based on the selected spindle.
TIP: Shear Rate will be displayed as zero for spindles that do not have SRC values.
Temperature Temperature is the input value from a connected AMETEK Brookfield temperature probe. The DVNext is provided with a DVP-94Y probe that can be inserted into the test sample or a water bath. The Cone/Plate version of the DVNext can be utilized with a sample cup that includes an embedded temperature probe. Some AMETEK Brookfield

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accessories include temperature probes (Thermosel) or optional chambers with embedded temperature probes (Small Sample Adapter). The units of temperature are defined in the Global Settings section of the Settings Menu. The temperature will not be displayed when no temperature probe is connected.
Speed Speed is the selected speed from the Configure Viscosity Test screen
TIP: Speed can be changed by switching from the Running Viscosity Test screen to the View Test screen using the blue arrow in the Speed field.
TIP: When Speed is changed in the View Test screen, the Test Name will be changed to unsaved.
The status of the test configuration is indicated in the gray bar above the data fields. A configuration that has been saved will be indicated by a display of the test file name. A configuration that is not saved will be indicated by a display of Unsaved Test.
The Real Time Graph is displayed at the bottom of the Running Viscosity Test screen. This graph shows all measurements during the life of the test. The Y-axis can represent any data field. The data field represented on the graph is shown by the blue dot; for example, in Figure 3-42, Torque is shown on the graph. Any data field can be selected by touching the screen.
The Real Time Graph will indicate data points collected as part of the test with a blue dot on the data line. At the conclusion of the test, the Real Time Graph is displayed for review. Once the OK button is pressed, only the data points collected as part of the test will be available for review/save. The Real Time Graph cannot be seen again once the Results page is in view.
QC Limits will be indicated on the Real Time Graph when the selection for Y-Axis is the same as the selection for QC Limits (see Section III.9).
Two Command Keys are available on the Running Viscosity Test screen: Stop Test and View Test.
Stop test Immediately stops the current test. The user will be presented with a confirmation box. The test will continue to run until Yes is selected in the Confirmation box. If any data had been collected during the test, the user will be presented with the Results screen. If data was not collected, the user will be returned to the Configure Viscosity Test screen.
TIP: If the operator selects “Do not show this message again” within the Confirmation box, then the Confirmation box will no longer be displayed when Stop Test is pressed. This condition can be reset in the Display section of User Settings.
View test Change the view from measurement to test parameters including: Spindle, Speed, Temperature, End Condition, Data Collection, QC Limits, Instructions, and Density. The View Test screen includes a live display of Torque and a Time parameter that shows the total elapsed time for the test (see Figure 3-43).

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Figure 3-43
The More/Less Bar can be used to reduce the number of parameters shown in the display.
The Speed parameter is active in this view. The operator can change the speed of test without returning to the Configure Viscosity Test screen.
TIP: If the speed is changed during the execution of a saved test, then the test status will be changed to “Unsaved Test”. This will also be reflected if the collected data is saved.
View Test includes the Stop Test command key and a Back Arrow navigation key. The Back Arrow is used to return the display to the Running Viscosity Test view.

3.14 Results
Measurement data is viewed in the Results screen. This screen is presented at the conclusion of a test or when data is loaded through the View Results selection from the Home Menu.
The DVNext utilizes a comprehensive data format. Data files include the complete set of measurement results and calculated values along with the test protocol. All elements of the test can be viewed in the Results screen.
The DVNext Rheometer allows for 5000 total data points per file. When viewing large data files, additional time is required when moving from the various Results options listed below. There may be some delay on the screen while the DVNext prepares the data.
The Results screen includes several Navigation Icons and Command Keys.

Home:

Return to the Home Menu.

Down Arrow:

Select Results Options.

Blue Arrow:

Select Page of Results Table.

Print:

Print Data to USB printer.

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Save:

Save data.

Configure Test: Return to Configure Viscosity Test screen.

Scroll Bar:

Move up/down through a page of data.

The Results screen offers several options for viewing test data. These options are accessed via the Down Arrow in the Navigation Bar at the top of the screen (see Figure 3-44).

Figure 3-44
Table Display all data points. Data will be shown in a scroll list where each page can hold a maximum of 50 points. If the data set has more than 50 points, then additional pages will be indicated at the bottom of the screen. Additional pages of data can be accessed using the Blue Arrows.
Each data point includes: Viscosity, Torque, Speed, Temperature, Time, Shear Stress (SS), Shear Rate (SR), Density, and Accuracy.
Post test averaging Average and Standard Deviation are calculated for measured and calculated parameters including: Viscosity, Torque, Shear Stress, and Temperature.
Post Test Averaging is calculated regardless of the Data Collection setting. If Data Collection was set to Multi-point Averaging, then the Post Test Averaging will calculate an average of the averaged data.
When using multiple step programs, the test step utilized for Post Test Averaging is specified in the Report setting (see Section III.11).
Test used Display the test elements used to generate the data set. In this view, the Configure Test button is available. Selecting Configure Test will program the DVNext to run the same test utilized to collect the data set being viewed and present

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the Configure Viscosity Test screen.
Notes Document any relevant information about the test or data. This information will be stored with the data set once saved.
Compare results Load two data sets and view side by side, must be run from the same test to be able to compare results.

Figure 3-45
Device info Display basic information about the data file and the specific DVNext Rheometer used to collect the data including: date and time the test started, completed and was saved; if user accounts are active, which user saved the data; rheometer serial number, firmware version, rheometer Torque range (LV, RV, HA, HB, other).
Graph Display a graph of the collected data. The axis will default to the values selected in the Report section of the Test. The value displayed on each axis can be changed by selecting from the blue drop down arrow in each field. Individual data points can be selected, and the X / Y coordinate values will be displayed. The selected point is represented by a blue dot (other points are shown as gray dots).
TIP: Some spindle selections do not allow for the calculation of shear stress and shear rate. Shear Stress and Shear rate will be represented as ” —” for all data points for this type of spindle.
TIP: If the temperature probe is not connected to the DVNext, then the temperature field will not contain any data. The Graph will not display temperature under this condition.
The buttons at the bottom of the graph are for zooming in, zooming out, and resetting.
Math models Analyze collected data through several defined equations. The selected math model will default to the selection from the Report section of the Test. You can change the selected model by pressing the blue drop down arrow.
Math Models available on the DVNext Rheometer include Bingham, Casson, NCA/CMACasson, Power Law, IPC Paste, and thix index. Each Math Model will be displayed in equation form with parameter values and confidence of fit calculations shown. Additionally, a graph of the model will be shown when available (no graph is available for this Index). The graph is a visual aid only and will not be included with a print.
Figure 3-47 shows the Power Law equation for a typical set of data. A brief definition ofthe equation will be shown if the “i” (information) button is pressed.

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Figure 3-46

Figure 3-47

Data averaging The DVNext Rheometer offers two techniques to average data, Live Averaging and Post Test Averaging. Data averaging can be useful when measuring samples with entrained air or suspended particles that cause some variation in measurement results. Data averaging may not be useful when changes in measurement results are caused by the rheological properties of the test sample such as thixotropy or pseudoplasticity (shear thinning). Materials that exhibit thixotropy will show a steadily decreasing measured viscosity over time. Materials that exhibit pseudoplasticity will show a changing viscosity as the spindle speed changes.
TIP: When averaging data for a thixotropic material, begin the Averaging Duration after the period of most significant change in measured viscosity. This will reduce the variability in the averaged value.
TIP: When averaging data for a pseudoplastic material, do not average together (Test Averaging) data collected at different speeds (or shear rates).
Live Averaging of data occurs during actual testing of a sample. Data can be collected as an average of readings over a specific time interval; each data point saved in the file is an averaged value. This averaging is defined in the Data Collection section of Configure Viscosity Test.
Single Point Averaging Single Point Averaging requires a definition of Averaging Duration, the amount of time for which readings will be averaged. This time parameter will be applied at the end of the End Condition. In this case a single data point will be collected which represents the average of all data measured during the specified time period (Averaging Duration).
Multi-Point Averaging Multi-point Averaging requires a definition of 1) Data Interval, the frequency of data collection and 2) Averaging Duration, the amount of time for which readings will be averaged. These two parameters will work in conjunction to generate multiple data points each of which represent the average of all data measured during the average duration within the specified Data Interval.
Post Test Averaging Post Test Averaging of data occurs after the test is complete, through the Results screen. Averages and standard deviation values can be generated for data collected in a single step or across several steps. If the test used to collect data utilized Live Averaging (described above), then the Post Test Averaging will produce an average value of averaged data points. Post Test Averaging can be specified in the Report section of Configure Viscosity Test When configured as part of the test, the average values will be displayed immediately upon test conclusion. If not specified

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in Report, Post Test Averaging can be selected from the Down Arrow in the Results screen.
Post Test Averaging offers two options: Step Averaging and Test Averaging (see Figure 3-48).
Step Averaging Calculate Average and Standard Deviation for all data collected within a single step test. Step Averages will be displayed as shown below in Figure 3-49
Test Averaging Calculate Average and Standard Deviation for all data collected within step specified. Test Averages will be displayed as shown below in Figure 3-50.

Figure 3-48

Figure 3-49

Figure 3-50

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4. MAKING YIELD MEASUREMENTS
4.1 Quick start
The DVNext Rheometer uses the same methodology for yield measurements as the AMETEK Brookfield YR-1 and DV-III Ultra Rheometers. If you have experience with other AMETEK Brookfield equipment, this section will give you quick steps for making a yield measurement. If you have not used a AMETEK Brookfield Rheometer before, skip this section and go to (Section 4.2) for a detailed description.
· Assemble and level the DVNext Rheometer (Section 1.4). · Turn power on. · Autozero the rheometer (Section 2.2). · The DVNext will display the Configure Viscosity Test Screen. Press the Home Icon in the Navigation Bar.
From the Home Menu, select Configure Yield Test. · Select: Spindle, Immersion Mark, and Run Speed. · Attach the vane spindle to the DVNext.
· NOTE: If equipped with magnetic coupling, use the appropriate procedure to connect the spindle (see
Section III.3). Immerse the spindle gently into the test sample by lowering the DVNext on the Model G laboratory stand. · Press the Run button. The screen will change to the Running Yield Test Screen. · When the Yield Test is complete, the DVNext will present the Yield Test Complete screen. Record the Stress (yield stress), Torque, and Temperature. · To run another test, press Configure Test. To return to the Home Menu, press the Home Icon.

4.2 Preparations for making measurements

RHEOMETER: The DVNext should be turned on, leveled and autozeroed. The level is adjusted using

the two feet on the bottom of the base and confirmed through aligning the digital bubble on the

screen with the center of the leveling circle. Adjust the feet until the bubble is inside the center

target. Set the level prior to autozero.

The proper level is essential for correct operation of the DVNext.

Sample: The measured yield value is very dependent on how the sample is handled prior to the

measurement. The sample should be disturbed as little as possible prior to inserting the vane

spindle. AMETEK Brookfield recommends testing the sample in the container in which it is provided

when possible. If it is necessary to transfer the sample to a new container, then it is recommended

to include a pre-shear and/or wait time in the Yield Test. This pre-shear and wait time will provide a

common history to each sample to aid in sample to sample comparison.

AMETEK Brookfield recommends the use of vane spindles for measuring yield value. The vane spindle provides a unique geometry that minimizes disturbance of the sample during spindle insertion.

Many samples must be controlled to a specific temperature for yield measurement. When conditioning a sample for temperature, be sure to temperature control the contrainer and spindle as well as the sample.

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4.3 Selecting a spindle/speed
The DVNext has the capability of measuring viscosity over an extremely wide range. For example, the DVNext RV can measure fluids within the range of 100-40,000,000 cP. This range is achieved by using several spindles over many speeds. See Appendix B for details.
The process of selecting a spindle and speed for an unknown fluid is normally trial and error. An appropriate selection will result in measurements made between 10-100 on the instrument % torque scale. There are two general rules that will help in the trial and error process:
· Viscosity range is inversely proportional to the size ofthe spindle.
· Viscosity range is inversely proportional to the rotational speed.
In other words: to measure high viscosity, choose a small spindle and/or a slow speed. If the chosen spindle/speed results in a reading above 100%, then reduce the speed or choose a smaller spindle.
Experimentation may reveal that several spindle/speed combinations will produce satisfactory results between 10-100%. When this circumstance occurs, any of the spindles may be selected.
Non-Newtonian fluid behavior can result in the measured viscosity and yield stress changing if the spindle and/or speed is changed. See our publication, “More Solutions to Sticky Problems”, for more details.
When viscosity data must be compared, be sure to use the same test methodology: namely the same instrument, spindle, speed, container, temperature, and test time. DVNext LV Rheometers are provided with a set of four spindles and a narrow guard leg; DVNext RV Rheometers come with a set of six spindles and a wider guard leg; DVNextHA and DVNext HB Rheometers come with a set of six spindles and no guard leg. (See Appendix G for more information on the guard leg.)

Figure 4-1 Figure 4-2

The spindles are attached to the rheometer by screwing them onto the coupling nut on the lower shaft (see Figure 3-4). Note that the spindles have a left- hand thread. The lower shaft should be secured and slightly lifted with one hand while screwing the spindle to the left. The face of the spindle nut and the matching surface on the lower shaft should be smooth and clean to prevent eccentric rotation of the spindle. Spindles can be identified by the number on the side of the spindle coupling nut.

The motor should be OFF whenever spindles are being removed or attached.
Note: Keep the Magnetic Coupling and inner sleeve as clean as possible and free from debris that could become lodged inside the adapter.

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4.4 Temperature control
The DVNext Rheometer provides the ability to control the temperature of a connected AMETEK Brookfield temperature control device such as the Thermosel (HT-106 controller) and water baths with SD or AP controllers (for example: TC-550SD). The Thermosel or water bath can then be used to control the temperature of the sample under test.
The DVNext connects to the temperature control device through a dedicated communication cable. The Thermosel requires cable DVP-141. The water baths require cable DVP-207. These cables are available from AMETEK Brookfield.
When configured for control of a temperature control device, the DVNext may have two temperature inputs:
· The temperature probe supplied with the DVNext (DVP-94Y, CPA-44PYZ, or SC4-13RPY) and · The temperature probe supplied with the temperature control device (water bath or Thermosel).
Only one temperature probe can be used for display of live temperature, control, and data collection. Select the probe to be used in the Temperature menu (see Figure 4-3).
Temperature control must be initiated each time the DVNext is powered on. Be sure that the temperature control device is powered on prior to initiating communication. Choose Device Setup in the Settings menu. Choose Temperature and the Temperature menu will appear (see Figure 4-4). Temperature Offset is described in Section 4.4.`

Figure 4-3

Figure 4-4

Select Temperature Controller and you will be presented with the Default Temperature menu (see Figure 4-4). This menu allows the user to 1) initiate communication with the temperature controller and 2) set a default temperature.

Initiate temperature control by pressing the Test Connection. The connection status will be confirmed with a message box and the appearance of the bath icon in the status bar (see Section 2.3).

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4.5 Test parameters
The Configure Yield Test screen includes several parameters to specify the test method; Spindle, Immersion Mark, Pre-Shear Speed, Pre-Shear Time, Zero Speed, Wait Time, Run Speed, Torque Reduction, and Temperature. The required parameters are Spindle, Immersion Mark, Run Speed and Torque Reduction. All other parameters are optional including those shown below the More/Less bar; Yield Limit, Instructions, Save Path.
Spindle Spindle Number A two (2) digit code representing the spindle number used for the test must be selected. See Appendix A for more information regarding spindles for use with the DVNext Rheometer. Selection of the appropriate spindle code is important to ensure correct stress calculations. AMETEK Brookfield recommends the use of vane spindles for yield measurements.
Immersion Mark Each vane spindle has two (2) immersion marks. The primary immersion mark is located on the spindle shaft. Normally, the spindle should be inserted so that the sample reaches this mark. If the sample container is too small to allow the spindle to be inserted to this mark, the secondary immersion mark may be used. This mark appears halfway down the blades of the vane spindles. See Appendix D for more information regarding spindles and immersion marks.
Note: Selection of the appropriate immersion mark is important to ensure correct stress calculations.

Figure 4-5

Pre-shear speed and time An optional Pre-Shear step can be included in the test parameters. The user must supply the pre-shear speed (0.01250 RPM) and pre-shear time (1 second-5 minutes 59 seconds).
Pre-shearing is the shearing of sample before measuring its yield properties. This process breaks down the sample’s structure. It is particularly useful if the investigator wants to eliminate previous shear history (e.g., bumping, transferring) of the sample before testing and observe the structural rebuilding of the sample. This may simulate the following: ketchup pumped out of a bottle will rebuild after it comes to rest on the French Fries. There are materials whose measured yield stress will be lower after pre-shearing than if tested without pre-shearing. This may be used to compare the rate at which different materials rebuild. The yield stress measured in a pre-sheared sample is the “dynamic yield”, while the yield stress measured for an originally undisturbed material is the “static yield”. Zeroing after pre-shearing is performed on the sample is highly recommended for every test. The next section explains how to do this.
TIP: Set Pre-Shear Speed and Pre-Shear Time to zero if no Pre-Shear is required.
Zero An optional, but highly recommended, torque Zero step can be included in the test parameters. A zero speed will cause the rheometer to rotate the motor in the appropriate direction until 0% torque is achieved.
This may be necessary because the spindle sometimes twists a small amount during insertion into the sample. This results in a small, although possibly significant, torque applied to the sample. Slow zeroing speeds are used to

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eliminate this initial torque and minimize effects on the sample’s structure before the test is started. Zeroing is an essential step after pre-shearing. A zero step ensures a consistent starting point for each test. A speed for the step must be supplied in the appropriate box (0.01 – 0.50). Faster speeds achieve a “zero” quicker but may cause a more variable starting point. The DVNext will reset zero speed to 0.01 RPM when the %Torque value reaches 0.20% Torque.
Wait Time An optional Wait Time step can be included in the test parameters. Wait Time creates a time delay after zeroing before the actual test run begins. During this delay, the motor shaft will be at zero (0) RPM. Wait Time is the time the sample is allowed to rest between the completion of zeroing and the start of the yield measurement. Some samples rebuild structure more slowly than others after shearing, such as during handling, pouring sample into a beaker, etc. Certain low-viscosity paints may also have a low yield stress. Waiting 30 seconds, for example, after immersing the spindle may allow the sample to rebuild, producing a more consistent test method.
Run Speed Run Speed is the motor speed for the DVNext at which the material is tested. It is common for materials to appear stiffer when tested at higher speeds. That is, the slope of the stress-vs.-strain curve increases with increasing speed. This is because the material structure has less time in which to react to dissipate the applied stress. Increasing the speed will, in most cases, increase the yield stress measured by the instrument. Most yield tests are conducted at relatively low speeds (<1 RPM) to minimize any inertial effects when using vane spindles. The range of acceptable run speeds is 0.01 – 5.0 RPM.
Torque Reduction Torque Reduction is percentage change in torque value between successive data points. That is, the material yields or begins to break down and, as a result, the measured incremental torque begins to decrease. A value of 100% for this parameter causes the test to stop as soon as there are no torque increases during a base time increment. Some users may wish to see a drop in torque after the yield point. Setting this parameter to values greater than 100% allows data to be collected after the yield point by the RheocalcTTM software so the decrease in torque may be more easily visualized. However, this will also affect the calculated yield stress value.
TIP: AMETEK Brookfield recommends a torque reduction value of 100%.
Yield Limits These stress values can be used as a Quality Control tool. If the resulting yield stress from a test falls outside these limits, an appropriate message is displayed and printed with the results. Entering zero (0) for both these parameters disables this QC feature.
Instructions Record specific instructions to the operator. This information will be presented immediately when the program is Run (see Figure IV-6). The operator is required to acknowledge the message before the program will continue.

Figure 4-6

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TIP: If the operator selects “Do not show this message again” within the Instructions message box, then Instructions will no longer be displayed for any test. This condition can be reset to allow Instructions to be displayed in the Display section of User Settings .
TIP: Instructions can be viewed during the test by selecting instructions (more/less bar) in the View Test screen.
Save Path Define the memory location (internal or USB Flash Drive) where the Test Results will be saved.
TIP: Selecting a data path can help to organize data storage in the internal memory of the DVNext. By preselecting the data path, operators are directed to put the data from specific tests into specific areas.
TIP: If you select a data path that includes a USB Flash Drive location and the Flash Drive has been removed, an error message will be displayed.
4.6 Running a Yield Test
A Yield Test is started by pressing the Run button on the Configure Yield Test screen. When Run is pressed, the display will change to the Running Yield Test screen (see Figure 4-7).

Figure 4-7
The Running Yield Test screen provides information on the current measurement including: Delta Torque, Torque, Stress, Strain, Temperature, and Speed.
Delta Torque Delta Torque is the difference between the current %Torque value and the previous %Torque value. As the sample approaches its yield point, the Delta Torque percentage should decrease. If the Torque Reduction for the test is 100%, the yield point occurs when the % decrease in Torque = 100.
Torque Torque is the deflection of the Rheometer torque sensor. It is described as percent (%) and has a range of 0 100%. The DVNext will provide measurement results within the stated accuracy provided the Torque reading is between 10 and 100%. If the torque reading falls below 10% the labels in the data fields will flash to indicate an error condition. AMETEK Brookfield does not recommend that data be collected below 10% Torque however data collection is not restricted.
TIP: Torque on the DVNext is equivalent to the % reading from the DV-III Ultra and the YR-1 Rheometer.
Stress

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Stress is the calculated stress based on the Speed, Torque, and Spindle.
Strain Strain is the Apparent Strain placed on the sample. The Apparent Strain is the angular distance that the spindle rotates in the sample.
Temperature Temperature is the input value from a connected AMETEK Brookfield temperature probe. The DVNext is provided with a DVP-94Y probe that can be inserted into the test sample or a water bath. The Cone/Plate version of the DVNext can be utilized with a sample cup that includes an embedded temperature probe. Some AMETEK Brookfield accessories include temperature probes (Thermosel) or optional chambers with embedded temperature probes (Small Sample Adapter). The units of temperature are defined in the Global Settings section of the Settings Menu. The temperature display will be when no temperature probe is connected.
Speed Speed is the selected speed from the Configure Yield Test screen.
The status of the test configuration is indicated in the gray bar above the data fields. A configuration that has been saved will be indicated by a display of the test file name. A configuration that is not saved will be indicated by a display of Unsaved Test.
The Real Time Graph is displayed at the bottom of the Running Yield Test. This graph shows all measurements during the test. The Y-Axis can represent any data field. The data field represented on the graph is shown by the blue dot; for example, in Figure 4-7, Torque is shown on the graph. Any data field can be selected by touching the screen.
The Real Time Graph will indicate data points collected as part of the Test with a blue dot indicating the final point. At the conclusion of the test, the Real Time Graph is displayed for review. Once the OK button is pressed, the screen will transition to Results.
QC Limits will be indicated on the Real Time Graph when the selection for Y-Axis is the same as the selection for QC Limits (see Section 3.9).
Two Command Keys are available on the Running Yield Test Screen: Stop Test and View Test.

Stop Test: View Test:

Immediately stop the current test. The user will be presented with a confirmation box. The test will continue to run until Yes is selected in the Confirmation box. The user will be presented with the Results screen with any data that was collected.
Change the view from measurement to the test parameters. The View Test screen includes a live display of temperature. View Test includes the Stop Test command key and a Back Arrow in the Navigation Bar. The Back Arrow is used to return the display to the Running Yield Test view.

Measurement Measurement data is viewed in the Results screen. This screen is presented at the conclusion of a test or when data
is loaded through the View Results selection from the Home Menu .

The DVNext utilizes a comprehensive data format. Data files include the complete set of measurement results and calculated values along with the test protocol. All elements of the test can be viewed in the Results screen.

The DVNext Rheometer allows for 5000 total data points per file. When viewing large data files, additional time is required when moving from the various Results options listed below. There may be some delay on the screen while the DVNext prepares the data.

The results screen includes several Navigation Icons and Command Keys.

Home:

Return to the Home Menu.

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Down Arrow: Blue Arrow:

Select Results Options. Select Page of Results Table.

Print: Save:

Print Data to USB printer. Save data.

Configure Test: Return to Configure Viscosity Test screen.

Scroll Bar:

Move up/down through a page of data.

The Results screen offers several options for viewing test data. These options are accessed via the Down Arrow in the Navigation Bar at the top of the screen (see Figure 4-8).
Table Display all data points. Data will be shown in a scroll list where each page can hold a maximum of 50 points. If the data set has more than 50 points, then additional pages will be indicated at the bottom of the screen. Additional pages of data can be accessed using the Blue Arrows.
Each Yield Results Table data point includes Delta Torque, Torque, Temperature, Time, Stress, and Strain.
Test used Display the test elements used to generate the data set. In this view, the Configure Test button is available. Selecting Configure Test will program the DVNext to run the same test utilized to collect the data set being viewed and present the Configure Viscosity Test screen.
Notes Document any relevant information about the test or data. This information will be stored with the data set once saved.
Compare results Load two data sets and view side by side (see Figure IV-9), must be run from the same test to be able to compare results.
Device info Display basic information about the data file and the specific DVNext Rheometer used to collect the data including: date and time the test started, completed and was saved; if user accounts are active, which user saved the data; rheometer serial number, firmware version, rheometer Torque range (LV, RV, HA, HB, other).
Graph Display the final data point and graph (see Figure 4-10). The graph axis (X and Y) can be changed by selecting the blue drop down arrow in the appropriate data field. Zoom and reset controls are indicated under the X-Axis.

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Figure 4-8

Figure 4-9

Figure 4-10

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5. SETTINGS
The Settings menu provides access to the many controls and features of the DVNext Rheometer. This menu can be accessed through the Settings Navigation Icon which is often present in the Title Bar. Figure 5-1 shows the Settings Menu which is divided into: Device Setup, User Settings, Global Settings, and Admin Functions. Global Settings include items that affect the complete range of features within the DVNext. Admin Functions include items related to administrator level controls.

Figure 5-1

5.1 Device setup

The Device Setup menu includes settings related to the mechanical systems and connections of the DVNext. Eight settings are available including:

Temperature –

Create offsets to be used with specific temperature probes, initiate control of the AMETEK Brookfield Thermosel or Temperature Bath.

Printer Setup –

Define the print format to be used with the Dymo 450 Printer.

AutoZero –

Force the DVNext to perform an AutoZero as is done at start up.

Oscillation Check –

Evaluate the performance of the DVNext lower bearings. Technical Support Information that may be requested by AMETEK Brookfield Technical Info Support staff to assist with troubleshooting.

About –

Present basic information about the DVNext as is done at start up.

The temperature menu provides access to three functions: Temperature Offset,Temperature Controller Access, and Temperature Display/Settings.

Temperature The Temperature Offset setting allows the user to create up to 10 temperature offset values for connected temperature probes. AMETEK Brookfield offers several types of temperature probes for use with the DVNext including: DVP-94Y immersion probe (supplied with the DVNext), CPA-44PYZ embedded probe (optional with Cone/ Plate DVNext Rheometers), and SC4-13RP embedded probe (optional with Small Sample Adapter). Any of these probes can be calibrated locally against a standard reference thermometer to determine an offset (how far from the actual temperature does the probe read). This offset can be entered the DVNext Rheometer and identified with a name defined by the user.

When Temperature is selected in the Device Setup menu, the Temperature Offset menu is presented (see Figure 5-3). From this menu you can create new offset values by pressing the Add Probe Offset command key at the bottom of the screen and you can select which offset to utilize with the DVNext by pressing the circle beside the name.

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In Figure 5-3, the offset DVP-94Y 3 has been selected as indicated by the blue circle.

Figure 5-2

Figure 5-3

Figure 5-4

The creation of a Temperature Offset requires input of the offset value and a name. The offset value must be in the range of -9.9 to 9.9°C. The Name can be up to 14 characters long. To delete an existing Temperature Offset, first select the offset from the list, then press the Delete command key at the bottom of the screen.

The use of a Temperature Offset will be indicated in the Temperature field displayed in the Configure Viscosity Test screen with a (o) beside the Live indication.

The Temperature menu also allows the user to initiate control over a connected temperature control device such as the AMETEK Brookfield Thermosel (HT-106 controller) or Water Bath (model TC-XX0SD or TC-XX0AP). Establish control over the external temperature controller by selecting Temperature Controller in the Temperature menu (see Figure 5-2). Press the Test Connection command button to verify that communication has been established between the DVNext and the temperature controller. Be sure that the temperature controller is turned on prior to pressing the Test Connection button. The Default Temperature screen also allows the user to set a Default Temperature. The Default Temperature is the set point value that will be used by the DVNext when a test (Viscosity Test or Yield Test) is not in use. To set the Default Temperature first, enter a temperature value and second check the Default Between Tests check box.

TIP: Use a Default Temperature when the test program includes a change in temperature and set the value equal to the first temperature control point in the test. At the conclusion of the test, the control device will be reset to the first temperature set point which will minimize the time required between tests.

The Temperature screen also allows you to choose which temperature probe will be used for data collection and temperature control. When the DVNext is controlling temperature through an external device, there may be two temperature probes available for data collection: 1) the temperature probe connected to the DVNext (Probe) and 2) the temperature probe associated with the temperature control device (Controller). Press either Probe or Controller in the Temperature menu.

Printer Setup The DVNext is configured for use with the Dymo 450 printer. No other printers can be utilized with the rheometer. Printer Setup allows the user to choose from three different configurations for print out.

Label Small:

A small label (1.13-inch x 3.5 inch) that allows for printing of limited data for a single data point. The label stock is available from AMETEK Brookfield; part number GV-1048 (standard) or GV-1082 (long life).

Label Large:

A large label (2.31-inch x 4.0 inch) that allows for printing of a complete set of parameters for a single data point. The label stock is available from AMETEK Brookfield; part number GV-1049 (standard) or GV-1083 (long life).

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Receipt:

A continuous roll of paper that allows for printing of multiple data points. The paper stock is available from AMETEK Brookfield; part number GV-1047 (standard) or GV-1081 (long life).

The Printer Setup is selected by touching the desired configuration, which will result in a blue circle to appear to the left of the item. The OK command key must be selected to confirm the setting.

AutoZero AutoZero is an operation performed by the DVNext Rheometer automatically during the power up sequence. This operation sets the instrument transducer to a correct zero value. The zero value should not shift over time, however, if the user determines that the zero is not correct, you can force an AutoZero to be performed without powering down the rheometer. When the AutoZero function is selected, the DVNext is immediately set to AutoZero mode and the user is presented with the AutoZero screen (see Figure 2-3). Upon completion, the user will be returned to the Device Setup menu.

Oscillation Check The Oscillation Check is a check of the performance of the lower bearing of the DVNext.This lower bearing is either Point and Jewel or Ball Bearing. Correct performance of the lower bearing is essential for proper operation of the rheometer. A failed lower bearing will normally cause viscosity measurements to be lower than expected. Selecting Oscillation Check in the Device Setup menu will present the user first with a screen instructing to level the rheometer and remove the spindle. Confirmation of level and spindle removal will present the user with the Oscillation Check screen as shown below.

Figure 5-5
A successful Oscillation Check will show a very smooth decrease of %Torque with a final value within +/-0.3 of 0.0. Any value above 0.3 % or below -0.3% indicates that a calibration check should be performed (see Appendix F).
The Oscillation Check is not a guarantee of proper calibration. It is only an indication of the performance of the lower bearing of the rheometer. Calibration can only be verified using a calibration standard such as AMETEK Brookfield Silicone and Mineral Oil standards.
See Appendix H for additional information.
Technical Support Info The information contained in the Technical Support Info menu is designed to support AMETEK Brookfield for problem resolution. When contacting AMETEK Brookfield for support, you may be asked to provide information contained in one of the menu choices within Technical Support Info. There are no settings within this section and the performance of the DVNext Rheometer cannot be affected by accessing this section.
About The About screen is shown during the start-up sequence of the DVNext Rheometer. Selecting About in the Device Setup menu will show the same information (see Figure V-6). Information in the About screen includes: Torque Range (LV, RV, HA, HB), Model Number, Firmware Version, Rheometer Serial Number, TK version (torque table), Spindle version (spindle table).

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Figure 5-6
TIP: The information on the About screen will be needed when contacting AMETEK Brookfield for support. To return from the About screen, press the Left Arrow navigation button in the Title Bar.

5.2 User settings

The User Settings menu includes settings related to specific users. The DVNext may be set up for a single user setting (used by one or more operators) or for multiple users who access through a Log in and Password.

Three User settings are available including:

Sound –

Adjust the volume of the DVNext sounds and select which sounds to silence.

Display –

Adjust the brightness, select language and restore Pop-Up messages.

Change Password – Change the password for the Log In account used to access the DVNext Rheometer.

TIP: Each User can set their own preferences for Sound and Display.

Sound The Sound menu provides adjustment of the volume for the sounds utilized by the DVNext. Additionally, specific sounds can be toggled on/off including: Button Click, TestEnd Alarm, QC Limits Alarm, Global Alarm, and Pop-Up.

TIP: Sound settings can be returned to Factory Setting through Settings Reset found in the Admin Function Settings menu.

Display The Display menu provides adjustment of Screen Brightness, Language Selection, and Pop-Up Message management. The Screen Brightness adjustment applies to all screen views within the DVNext.

Note: The screen brightness is dimmed automatically after 5 minutes of no touch screen activity. The brightness will be dimmed to the lowest value. A single touch of the touch screen will return the display to the set brightness value.
The Language Setting is selected by pressing the Language field and choosing the appropriate language from the list. The selected language will be implemented immediately.
Pop-Up Messages can be toggled on/off through the check box (see Figure V-7). This check box applies to all Pop-Up Messages. Pop-Up Messages can be toggled off individually through the check box that appears within the

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message box. Once the Pop-Up is turned off, it will not be shown again. Pop-Up Messages can be restored through the use of the Restore Hidden Pop-Ups command key at the bottom of the Display Settings screen. This command key will restore all Pop-Ups.

Figure 5-7

Change Password A specific user can change their own password at any time. The user must first enter the current password. Then the user will be prompted to enter and confirm the new password.

TIP: If the administrator password is lost, it can be reset. Please contact AMETEK Brookfield or your local authorized dealer. Remember to have the information found in the About screen available.

Global Settings The Global Settings menu includes settings that affect the operation of the DVNext across all users and menus. These settings are independent of user log in. The five Global Settings include:

Measurement Units Regional Settings Global Alarm Spindle List Speed List –

Select the unit of measure for several parameters. Specify language, number, time, and date formats. Select single measurement parameter for alarm status. Configure the display of available spindles; create a special spindle. Configure the display of available speeds; create a new speed.

Measurement Units The Measurement Units menu displays the current selections for measurement units. Each unit can be changed by pressing the blue down arrow and selecting the desired value. Measurement Units are part of the data file for saved results. Available units include:

Viscosity Speed

cP P mPa·s Pa·s cSt mm2/s

centipoise Poise milliPascal seconds Pascal seconds centistokes millimeters squared per second 1000 cP = 10 P = 1000 mPa·s = 1 Pa·s 1 cSt = 1 mm2/s

RPM revolutions per minute

1/s

reciprocal seconds

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Temperature Stress (Shear) Density

C Centigrade F Fahrenheit
100°C = 5/9 * (212°F 32)

Dyne/cm2 N/m2 Pa

Dyne per square centimeter Newton / square meter Pascal 10 dyne/cm2 = 1 N/m2 = 1 Pa

g/cm3 kg/m3

gram / cubic centimeter kilogram / cubic meter 1 g/cm3 = 1000 kg/m3

TIP: When cSt units are chosen for viscosity, a density value must be entered in the Density field in Configure Viscosity Test.
The relationship between RPM and 1/s is defined by the SCR value of the selected spindle.
TIP: Density and viscosity are both sensitive to temperature. When using a density value in Configure Viscosity Test, be sure to enter a density value.
Regional Settings The Regional Settings menu displays the current selections for the default language, number format, date format and day separator. Each setting can be changed by pressing the blue down arrow and selecting the desired value. Regional Settings are part of the data file for saved results.
The Language setting established the default language for the DVNext. Individual users can choose a different language for use with their sp

BROOKFIELD M19-2101 DVNext Rheometer Instruction Manual

M19-2101 DVNext Rheometer

Product Information

Specifications

Introduction

Getting Started

Powering Up

Digital Leveling

AutoZero

Navigation

Home Screen

Out-of-Range

Printing

Making Viscosity Measurements

Temperature Control

Making Yield Measurements

Settings

Device Setup

User Settings

Administrator Account and Admin Functions

Frequently Asked Questions (FAQ)

Q: Can I reproduce or transmit this manual without

References

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