HK INSTRUMENTS DPT-Priima-MOD Multifunctional High Accuracy Transmitter Instruction Manual
- June 5, 2024
- HK INSTRUMENTS
Table of Contents
USER-FRIENDLY MEASURING DEVICES
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-Priima-MOD Series
INSTALLATION INSTRUCTIONS
INTRODUCTION
Thank you for choosing an HK Instruments DPT-Priima-MOD series transmitter.
DPT-Priima-MOD is a multifunctional high accuracy transmitter for measuring
volume flow, velocity, and static and differential pressure. It is designed
for cleanrooms and other demanding applications. The measurements can be read
and the configuration is done via Modbus communication. DPT-Priima-MOD can
also be used with several different measurement probes such as FloXact™ or
pitot tube, and air dampers.
DPT-Priima-MOD models come with a local display and an automatic, zero-point
calibration. A calibration certificate is available as an option.
APPLICATIONS
DPT-Priima-MOD is commonly used in applications requiring high measurement
accuracy:
- monitoring pressure in cleanrooms
- monitoring pressure differences across the building envelope
- monitoring pressure and flow
WARNING
- READ THESE INSTRUCTIONS CAREFULLY BEFORE ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS DEVICE.
- Failure to observe safety information and comply with instructions can result in PERSONAL INJURY, DEATH AND/OR PROPERTY DAMAGE.
- To avoid electrical shock or damage to equipment, disconnect power before installing or servicing and use only wiring with insulation rated for full device operating voltage.
- To avoid potential fire and/or explosion do not use in potentially flammable or explosive atmospheres.
- Retain these instructions for future reference.
- This product, when installed, will be part of an engineered system whose specifications and performance characteristics are not designed or controlled by HK Instruments. Review applications and national and local codes to assure that the installation will be functional and safe. Use only experienced and knowledgeable technicians to install this device.
SCHEMATICS
DIMENSIONAL DRAWINGS
INSTALLATION
- Mount the device in the desired location (see step 1).
- Open the lid and route the cable through the strain relief and connect the wires to the terminal block(s) (see step 2).
- The device is now ready for configuration.
WARNING! Apply power only after the device is properly wired.
STEP 1: MOUNTING THE DEVICE
- Select the mounting location (duct, wall, panel).
- Use the device as a template and mark the screw holes.
- Mount with appropriate screws.
| 
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Flow
The pressure tubes are connected to a flow measurement probe (i.e. FloXact),
or to the measurement ports specified by the fan manufacturer. Please see the
FloXact installation
guide or the fan manufacturer’s technical specifications for more information.
STEP 2: WIRING DIAGRAMS
For CE compliance, a properly grounded shielding cable is required.
- Unscrew the strain relief and route the cable.
- Connect the wires as shown in figure 2.
- Tighten the strain relief.
It is recommended to use a shielded twisted pair cable for Modbus cabling.
The cable shield must be earthed only at one point, normally, at the end of
the main cable.
STEP 3: CONFIGURATION
NOTE: The flow unit none is selected by default and the display shows
only the pressure reading.
-
Activate the device Menu by pushing the select button for 2 seconds
-
Select the functioning mode of the flow meter:
– Select Manufacturer when connecting DPT-Priima-MOD to a fan with pressure measurement points
– Select Common probe when using DPT-Priima-MOD with a common measurement probe that follows the formula:
-
If Common probe selected: select measurement units used in theformula (aka Formula unit) (i.e. l/s)
-
Select K-value
a. If manufacturer selected in step 2:
Each fan has a specific K-value. Select the K-value from fan manufacturer’s specifications.
Manufacturer:…………………. K-value:
Fläktwoods……………………..k = 0.3…99
Rosenberg………………………k = 37…800
Nicotra-Gebhardt…………..k = 50…4700
Comefri…………………………k = 10…2000
Ziehl…………………………….k = 10…1500
ebm-papst……………………k = 10…1500
Gebhardt……………………k = 50…4700
Nicotra……………………..k = 50…5300
b. If Common probe selected in step 1:
Each common probe has a specific K-value. Select the K-value fromcommon probe manufacturer’s specifications.
Available K-value range: 0.001…9999.000.
-
Select pressure unit for display: Pa, kPa, mbar, inWC, mmWC, psi or none.
-
Select desired pressure range:
±120 Pa, ±240 Pa, ±620 Pa, ±1240 Pa, ±2490 Pa
-
Select flow unit for display:
Flow volume: m³/s, m³/h, cfm, l/s, none (default)
Velocity: m/s, f/min, none
-
Response time: Select response time between 0.4–20 s.
-
Select the address for Modbus: 1…247.
-
Select the baud rate: 9600/19200/38400.
-
Select the parity bit: None/Even/Odd.
-
Push select button to save changes and to exit menu.
STEP 4: ZEROING THE DEVICE
NOTE! Always zero the device before use.
To zero the device three options are available:
-
Autozero calibration (manual zeroing not required)
-
Manual Pushbutton zero point calibration
-
Via Modbus register
-
Autozero calibration
Autozero calibration (-AZ) is an autozero function in the form of an automatic zeroing circuit built into the PCB board. The autozero calibration electronically adjusts the transmitter zero at predetermined time intervals (every 10 minutes). The functi on eliminates all output signal drift due to thermal, electronic or mechanical effects, as well as the need for technicians to remove high and low pressure tubes when performing initial or periodic transmitter zero point calibration. The autozero adjustment takes 4 seconds after which the device returns to its normal measuring mode. During the 4 second adjustment period, the output and display values will freeze to the latest measured value.
Transmitters equipped with the autozero calibration are virtually maintenance free and manual zeroing is not required.
-
Manual Pushbutton zero point calibration
NOTE: Supply voltage must be connected at least one hour prior to zero point adjustment.
a) Disconnect both pressure tubes from the pressure ports labeled +and –.
b) Push down the zero button until the LED light (red) turns on and the display reads “zeroing” (display option only). (see figure 3)
c) The zeroing of the device will proceed automatically in 4 seconds.
Zeroing is complete when the LED turns off, and the display reads 0 (display option only).
d) Reinstall the pressure tubes ensuring that the High pressure tube is connected to the port labeled +, and the Low pressure tube is connected to the port labeled −. -
Via Modbus register
Make sure there is no pressure in the duct when the zeroing is done via Modbus register.
STEP 5: MODBUS REGISTERS
Function code 04 – Read input register
Register| Parameter description| Data Type| Value|
Range
---|---|---|---|---
3×0001| Program version| 16 bit| 0…9900| 0,00…99,00
3×0002| Pressure reading Pa| 16 bit| -24900…24900 | ± 2490.0 Pa
3×0003| Pressure reading kPa| 16 bit| -24900…24900 | ± 2.4900 kPa
3×0004| Pressure reading mbar| 16 bit| -24900…24900 | ± 24.900 Pa
3×0005| Pressure reading mnnWC| 16 bit| -25400…25400 | ± 253.91 mmWC
3×0006| Pressure reading inWC| 16 bit| -10000…10000 | ± 10.000 inWC
3×0007| Pressure reading psi| 16 bit| -3610…3610 | ± 0.3611 psi
3×0008| Flow m3/s| 16 bit| 0…10000| 0…100 m3/s
3×0009| Flow m3/h| 16 bit| 0…30000| 0…30000 m3/h
3×0010| Flow cfm| 16 bit| 0…30000| 0…30000 cfm
3×0011| Flow I/s| 16 bit| 0…3000| 0…3000 I/s
3×0012| Velocity m/s| 16 bit| 0…1000| 0…100 m/s
3×0013| Velocity Unnin| 16 bit| 0…5000| 0…5000 f/min
*) The value and range are determined by the selected pressure range ±120 Pa, ±240 Pa, ±620 Pa,±1240 Pa, ±2490 Pa. The values shown in the table when the largest area is selected.
Function code 05 – Write single coil
Register| Parameter description| Data Type| Value|
Range
---|---|---|---|---
0x0001| Zero point calibration| Bit 0| 0…1| On – Off
Function code 03 – Read input holding register, Function code 06 – Write single register, Function code 16 – Write multiple registers
Register| Parameter description| Data Type| Value|
Range
---|---|---|---|---
4×0001| Manufacturer| 16 bit| 0…8| 0=F15kt Woods, 1=Rosenberg,
2=Nicotra-Gebhardt, 3=Comefri,
4=Ziehl, 5=ebm-papst, 6=Gebhardt,
7=Nicotra, 8=Common probe
4×0002| Formula unit (if manufacturer
selection = common probe)| 16 bit| 0…5| 0: m3/s, 1: m3/h, 2: cfm, 3: l/s,
4: m/s, 5: f/min
4×0003| K-factor integer| 16 bit| 0…9999| 0…9999
4×0004| K-factor decimal| 16 bit| 0…999| 0…999
4×0005| Response time| 16 bit| 0…20| 0=0.4 s, 1=1 s, 2=2 s…20=20 s
4×0006| Pressure Range| 16 bit| 0…4| 0=±120 Pa, 1=±240 Pa, 2=±620 Pa,
3=±1240 Pa, 4=±2490 Pa
RECYCLING/DISPOSAL
The parts left over from installation should be recycled according to your
local instructions. Decommissioned devices should be taken to a recycling site
that specializes in electronic waste.
WARRANTY POLICY
The seller is obligated to provide a warranty of five years for the delivered
goods regarding material and manufacturing. The warranty period is considered
to start on the delivery date of the product. If a defect in raw materials or
a production flaw is found, the seller is obligated, when the product is sent
to the seller without delay or before expiration of the warranty, to amend the
mistake at his/her discretion either by repairing the defective product or by
delivering free of charge to the buyer a new flawless product and sending it
to the buyer. Delivery costs for the repair under warranty will be paid by the
buyer and the return costs by the seller. The warranty does not comprise
damages caused by accident, lightning, flood or other natural phenomenon,
normal wear and tear, improper or careless handling, abnormal use,
overloading, improper storage, incorrect care or reconstruction, or changes
and installation work not done by the seller. The selection of materi- als for
devices prone to corrosion is the buyer’s responsibility, unless otherwise is
legally agreed upon. Should the manufacturer alter the structure of the
device, the seller is not obligated to make comparable changes to devices
already purchased. Appealing for warranty requires that the buyer has
correctly fulfilled his/her duties arisen from the delivery and stated in the
contract. The seller will give a new warranty for goods that have been
replaced or repaired within the warranty, however only to the expiration of
the original product’s warranty time. The warranty includes the repair of a
defective part or device, or if needed, a new part or device, but not
installation or exchange costs. Under no circumstance is the seller liable for
damages compensation for indirect damage.
SPECIFICATIONS
Performance
Measurement ranges:
±120 Pa, ±240 Pa, ±620 Pa, ±1240 Pa, ±2490 Pa (selectable via menu or Modbus)
default range
Accuracy (at applied pressure):
0.4 % ±0.4 Pa
(Including general accuracy, linearity, hysteresis, long-term stability, and
repetition error)
Overpressure:
Proof pressure: 10 kPa
Burst pressure: 30 kPa
Zero point calibration:
Automatic autozero, manual pushbutton, or via Modbus register
Response time:
0.4−20 s, selectable via menu or via Modbus register (63 % of the change)
Communication
Protocol: MODBUS over Serial Line
Transmission Mode: RTU
Interface: RS485
Byte format (11 bits) in RTU mode:
Coding System: 8-bit binary
Bits per Byte:
1 start bit
8 data bits, the least significant bit sent first 1 bit for parity 1 stop bit
Baud rate: selectable in configuration
Modbus address: 1−247 addresses selectable in the configuration menu
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Pressure units (select via menu):
Pa, kPa, mbar, inWC, mmWC, psi
Flow units (select via menu):
Volume: m³/s, m³/h, cfm, l/s
Velocity: m/s, ft/min
Measuring element:
MEMS, no flow-through
Environment:
Operating temperature: -5…50 °C
Temperature-compensated range 0…50 °C
Storage temperature: -40…70 °C
Humidity: 0 to 95 % RH, non-condensing
Physical
Dimensions :
Case: 102.0 x 71.5 x 36.0 mm
Weight: 150 g
Mounting: 2 each 4.3 mm screw holes, one slotted
Materials: Case: ABS
Lid: PC
Pressure fittings: Brass
Tubing: Silicone
Protection standard: IP54
Display
2-line display (12 characters/line)
Line 1: Volume or velocity measurement
Line 2: Pressure measurement
Size: 46.0 x 14.5 mm
Electrical connections:
4-screw terminal block
Wire: 0.2–1.5 mm² (16–24 AWG)
Cable entry:
Strain relief: M16
Knockout : 16 mm
Pressure fittings
Male ø 5.2 mm
+ High pressure
– Low pressure
Electrical Supply voltage:
24 VAC or VDC ± 10 %
Power consumption:
< 1 W
< 2.2 W during AZ-calibration
Output signal:
via Modbus
Conformance
Meets requirements for:
| CE:| UKCA:
---|---|---
EMC:| 2014/30/EU| S.I. 2016/1091
RoHS:| 2011/65/EU| S.I. 2012/3032
WEEE:| 2012/19/EU| S.I. 2013/3113
COMPANY WITH MANAGEMENT SYSTEM
CERTIFIED BY DNV
ISO 9001 • ISO 14001
Copyright HK
Instruments 2022
www.hkinstruments.fi
Installation version 1.0 2022