Time Electronics 7007 Loop Mate 2 Loop Signal Indicator User Manual

Time Electronics 7007 Loop Mate 2 Loop Signal Indicator

© 2021 Time Electronics Ltd.
All rights reserved.
Nothing from this manual may be multiplied, or made public in any form or manner, either electronically or hard copy, without prior written consent from Time Electronics Ltd.
This also applies to any schematics, drawings and diagrams contained herein.
This manual provides operating and safety instructions for the Time Electronics product. To ensure correct operation and safety, please follow the instructions in this manual.
Time Electronics reserves the right to change the contents, specifications and other information contained in this manual without notice.

Introduction

Features

• 4 – 20 mA, 0 -10 V, 0 – 50 V ranges
• LCD 4 digit display, mA, V, % of range
• Accuracy 0.05 %
• RxSim, TxTest, or 50 mA / 50 V modes
• Internal loop supply, 25 mA max
• Battery powered 9 V PP3
• Supplied with carry case and test leads

Description

The 7007 LoopMate 2 is a dedicated loop signal indicator (RxSim) with an in- built 24 V loop drive supply (TxTest). The operator can select the loop type, and also the type of units, either direct (mA) or % of span display. The loop signal is shown on an easy-to-read LCD display to an accuracy of 0.05% either in mA, V, or % of span.

It is a cost-effective process instrument suitable for service and maintenance engineers. It combines simple operation with the accuracy required for most process applications. Used in conjunction with the 7006 LoopMate 1 they provide full process loop testing capabilities, facilitating quick location of faults, testing and re-calibration.

In addition to TxTest (transmitter test) and RxSim (receiver simulation) the 7007 can be used to measure DC voltage in the process loop up to 50 V.
The unit is powered by a PP3 type battery. Rechargeable batteries can be used if required.

It comes complete with carrying pouch, leads and user manual.

Specifications

TxTest (RxSim plus internal 24V DC loop drive) : 0 to 25 mA or 0% to 100% (4-20mA).
Meas Volt DC : 0 to 50 V DC or 0% to 100% (0 to 10 V).
Accuracy| 0.05% of Span (% of span) 0.05% of Range (mA/V).
Indication| 4.5 digit LCD display
Connections| Two 4 mm recessed sockets
Power| PP3 battery
Case Material| ABS plastic
Carrying Pouch| Leatherette material. Includes compartment for leads and spare battery.
Leads| 4mm gold plated connectors.
Temperature Co-efficient| The unit stays in specification over operating temperature range.
Operating Temperature| 0 to 50 °C.
Storage Temperature| -30 to 70 °C.
Operating Humidity| 10 to 90% non-condensing, 25 °C.
Dimensions| H 140 x W 65 x D 27 mm (6.0 ´ 2.5 ´ 1.0 in).
Weight| 200 grams (7 oz).
Options| C145: Traceable calibration certificate (Factory). C144: Accredited calibration certificate (ISO 17025).
7006: Loop-Mate 1: Loop Simulator (separate product).

Front panel controls

Operation

Function Select

The Loop-Mate 2 has 3 functions:

1. Function 1 ……………… Rx SIM
2. Function 2 ……………… Tx TEST
3. Function 3 ……………… Meas Volt DC

These are selected using the function select switch.

Display Select

For RxSim and TxTest the signal can be displayed either direct (mA) or % of span
These are selected using the display select switch, which also turns off the Loop-Mate 2.

Description of typical process loop components

| 4 – 20 mA process loop
---|---
| 0 – 10 V process loop
| 4-20 mA Process loop and

4 – 20 mA Control loop.

This can be used for closed loop control.

Tx (transmitter):
This component converts physical signals such as pressure, temperature, flow, and level etc, into the loop signals (4 – 20 mA or 0 – 10 V).

Rx (receiver):
This component measures the loop signal and either displays it (indicator) or converts it to another form e.g. digital output for control purposes, (controller).

Process Controllers:
This device usually contains both Rx (signal loop) and Tx (control loop) components, which operate in separate loops. The Rx and Tx can be either 4 – 20 mA or 0 – 10 V.

Loop excitation supply:
A DC power supply (nominally 24 V) that drives the loop.

Rx Sim function

The unit displays the loop current in either mA (0-50 mA) or percentage of span (4-20 mA), depending on the position of the display select switch.

Operation

1. Connect the unit to the process loop observing the correct polarity.
2. Set the function switch to RxSim.
3. Turn the unit on, selecting the desired display units, using the display switch.

Note: If the loop current is less than 4 mA, negative % of span will be displayed.

See table below.

Connection

Tx Test function

With TxTest selected, a loop excitation drive supply (24v) is internally generated.
The display will show the loop current as either mA (0-50 mA) or percentage of span (4-20 mA), depending on the position of the display select switch.

Operation

1. Connect the unit to the process loop observing the correct polarity.
2. Set the function switch to TxTest.
3. Turn the unit on, selecting the desired display units, using the display switch.

Note: If the loop current is less than 4 mA, negative % of span will be displayed.

See table below.

Connection

Meas Volt DC function

When the unit is set to Meas Volt DC it displays the voltage either as Volts (0 – 50 V) or percentage of span (0 – 10V), depending on the position of the display select switch.

Operation

1. Connect the unit to the process loop observing the correct polarity.
2. Set the function switch to Meas Volt DC.
3. Turn the unit on, selecting the desired display units, using the display switch.

Connection  Note: The unit can be used to measure DC voltages up to a maximum of 50V DC.

Power supply

Battery life

A single PP3 battery powers the unit. Types that can be used are Zinc Carbon (250mAh), Alkaline (450mAh), Lithium (1200mAh) and rechargeable (150mAh). For best performance Lithium batteries are recommended. Under typical usage an Alkaline (450mA) battery will last for approximately 14 – 16 hours of continuous operation. Assuming the Loop-Mate2 is used for approximately 3 hours per day the batteries will last for a week or more. Continuous operation on the TxTest function will shorten the battery life. The unit will display ‘low battery’ when the battery voltage is too low. At this point replacement of the battery is necessary. It is recommended that a spare battery be always carried in the compartment provided in the carrying pouch.

Battery replacement

Slide off the back cover of the case and remove the battery from its compartment. Unclip the battery and replace it with a new PP3 as shown below. Then slide the battery cover back into place.

Maintenance

Calibration

Calibration equipment required
Precision DC current source (Time Electronics 1024 for example). Precision DC voltage source (Time Electronics 5025 for example).

Multimeter (DMM) with accuracy of 0.02% or better. Examples of suitable instruments are Time Electronics 5075 or HP 34401A.
Calibration should be performed at 23 °C ± 5 °C.

Calibration of Rx Sim
Direct reading (mA)

1. Connect the precision dc current source to the input terminals of the Loop-Mate 2.
2. Set the Function switch to RxSim.
3. Set the Display switch to mA/V.
4. Set the output of the DC current source to those shown (mA input to Loop-Mate 2) in the table below and check the display reading is between the Min and Max values.

Allowed error specification:

Percentage of Span

1. With the Loop-Mate 2 open circuit, set the Function switch to RxSim.
2. Set the Display switch to % of span.
3. The display should read –25.00 ± 0.01.
4. Switch off the unit.
5. Connect the precision dc current source to the input terminals of the Loop-Mate2.
6. Set the Function switch to RxSim.
7. Set the Display switch to % of span.
8. Set the output of the DC current source to those shown (mA input to Loop-Mate2) in the table below and check the display reading is between the Min and Max values.

Allowed error specification:

If the reading on the Loop-Mate 2 display is out of specification then adjustment of the calibration will be required (see later in this section).

Calibration of Meas Volt DC
Direct reading (V)

1. Connect the precision dc voltage source to the input terminals of the Loop-Mate 2.
2. Set the Function switch to Meas Volt DC.
3. Set the Display switch to mA/V.
4. Set the output of the dc voltage source to those shown (Volts input to Loop-Mate 2) in table below, and check the display reading is between the Min and Max values.

Allowed error specification:

Percentage of Span

1. Connect the precision dc voltage source to the input terminals of the Loop-Mate2.
2. Set the Function switch to Meas Volt DC.
3. Set the Display switch to % of span.
4. Turn on the Loop-Mate 2.
5. Set the output of the dc voltage source to those shown (Volts input to Loop-Mate 2) in table below, and check the display reading is between the Min and Max values.

Allowed error specification:

If the reading on the Loop-Mate 2 display is out of specification then adjustment of the calibration will be required (see later in this section).

Adjustment of Calibration

When Loop-Mate 2 is found to be out of specification the procedures described in the following sections can be followed to adjust and calibrate instrument.

Disassembling Loop-Mate 2

1. First remove the battery compartment cover and disconnect the battery, as shown in section 4.2 of this manual.
2. Remove the 4 screws from the back of the case.
3. Position the Loop-Mate 2 so that the front panel is facing upwards.
4. Carefully lift the case lid.
5. Then reconnect the battery.

Trimmer Locations (used for adjusting the calibration)

Reference voltage check and adjustment

1. Set the function switch to RxSIM

2. Set the Display switch to mA/V.

3. Select the voltage scale on the DMM
   Connect a test lead from the DMM negative input to the Loop-Mate 2 minus (-) terminal.

4. Connect a test lead with a pointed probe to the DMM positive input.

5. Place the pointed probe on the pad near to VR3 as shown in the picture, thus making contact with VR3`s middle pin. The reading should be 1 V.

6. Adjust VR3 until 1 V is displayed on the DMM.

RxSim / TxTest calibration

Note: By calibrating RxSIM, TxTest is also calibrated.

Direct reading (mA)

1. Connect the precision dc current source to the input terminals of the Loop-Mate 2.
2. Set the Function switch to RxSim.
3. Set the Display switch to mA/V.
4. Set the output of the current source to 50 mA DC.
   Adjust VR2 until the display reads 50.00

Percentage of span (%)
Offset calibration
Before connecting the Loop-Mate 2 to any test equipment,

• Set the Function switch to RxSim.
• Set the Display switch to % of span.

The display should read –25.00, if not adjust VR6 until –25.00 ± 0.01 is displayed. Then:

1. Connect the precision dc current source to the input terminals of the Loop-Mate2.
2. Set the Function switch to RxSim.
3. Set the Display switch to % of span.
4. Set the output of the current source to 20 mA DC.
   Adjust VR1 until the display reads 100.00

Meas Volt DC calibration

Direct reading (volts)

1. Connect the precision dc voltage source to the input terminals of the Loop-Mate 2.
2. Set the function switch to Meas Volt DC.
3. Set the Display switch to Volts.
4. Select 50v dc output on the precision voltage source.
   Adjust VR5 until the display reads 50.00.

Percentage of span

1. Connect the precision dc voltage source to the input terminals of the Loop-Mate2.
2. Set the function switch to Meas Volt DC.
3. Set the Display switch to % of span.
4. Select 10v dc output on the precision voltage source.
   Adjust VR4 until the display reads 100.00

Repeat the Direct reading and Percentage of span calibration procedures until neither require adjust. This is required due to some interaction between the scales.

Re-assembly

• Disconnect the battery after re-calibration.
• Refit the lid and screw the four case screws into place.
• Replace the battery and battery compartment cover. See section 4.2.

Fuse Replacement
The unit is fitted with a 100 mA fuse. If no readings are displayed when using the RxSIM or TxTest function when connected to a known working process loop, it is possible that the internal fuse has blown.

To replace the fuse:
First remove the battery compartment cover and disconnect the battery, as shown in section 4.2 of this manual.
Remove the 4 screws from the back of the case.
Position the Loop-Mate2 so that the front panel is facing upwards. Carefully lift the case lid.
The fuse is located below and to the right of the Display switch as shown in the picture below.

Pull out the fuse and replace with one of the same value.
Replace the case lid and screw the four case screws into place.

Warranty and Servicing

Warranty
The Time Electronics products carry a one-year manufacturer’s warranty as standard.
Time Electronics products are designed and manufactured to the highest standards and specifications to assure the quality and performance required by all sectors of industry. Time Electronics products are fully guaranteed against faulty materials and workmanship.
Should this product be found to be defective, please contact us using the below details. Inform us of the product type, serial number, and details of any fault and/or the service required. Please retain the supplier invoice as proof of purchase.
This warranty does not apply to defects resulting from action of the user such as misuse, operation outside of specification, improper maintenance or repair, or unauthorized modification. Time Electronics’ total liability is limited to repair or replacement of the product. Note that if Time Electronics determine that the fault on a returned product has been caused by the user, we will contact the customer before proceeding with any repair.

Calibration and Repair Services
Time Electronics offers repair and calibration services for all the products we make and sell. Routine maintenance by the manufacturer ensures optimal performance and condition of the product. Periodic traceable or accredited calibration is available.

Contacting Time Electronics
Online:
Please visit www.timeelectronics.com and select Support Request from the Contact links. From this page you will be able to send information to the Time Electronics service team who will help and support you.
By phone:
+44 (0) 1732 355993
By email:
[email protected]

Returning Instruments
Prior to returning your product please contact Time Electronics. We will issue a return merchandise authorization (RMA) number that is to accompany the goods returning. Further instructions will also be issued prior to shipment. When returning instruments, please ensure that they have been adequately packed, preferably in the original packing supplied. Time Electronics Ltd will not accept responsibility for units returned damaged. Please ensure that all units have details of the service required and all relevant paperwork.

Send the instrument, shipping charges paid to:

Time Electronics Ltd
Unit 5, TON Business Park, 2-8 Morley Road,
Tonbridge, Kent, TN9 1RA.
United Kingdom.

Tel: +44(0)1732 355993
Fax: +44(0)1732 350198

Email: [email protected]
Web Site: www.timeelectronics.com

Disposal of your old equipment

1. When this crossed-out wheeled bin symbol is attached to a product it means the product is covered by the European Directive 2002/96/EC.
2. All electrical and electronic products should be disposed of separately from the municipal waste stream via designated collection facilities appointed by the government or the local authorities.
3. The correct disposal of your old appliance will help prevent potential negative consequences for the environment and human health.
4. For more detailed information about disposal of your old appliance, please contact your city office, waste disposal service or return to Time Electronics.

References

• Time Electronics – Precision Test Instruments, Calibration Benches

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