Copyright HK Instruments 2022
www.hkinstruments.fi
Installation version 1.0 2022
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-CR-MOD Series
• 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.
Thank you for choosing an HK Instruments DPT-CR-MOD series dif-
ferential pressure transmitter. DPT-CR-MOD series is designed spe-
cially for cleanroom monitoring. In addition to differential pressure,
the device enables monitoring temperature and relative humidity.
A 0…10 V voltage input of an external humidity and temperature
transmitter can be connected to the input terminal of the device. In
this case, all three measured values (differential pressure, relative
humidity, temperature) will be shown simultaneously on the display.
Alternatively, a passive temperature sensor can be connected to the
input terminal.
DPT-CR-MOD is compatible with Modbus serial communication
protocol.
DPT-CR-MOD series devices are commonly used in HVAC/R
systems for:
• pressure, temperature and humidity monitoring in cleanrooms
SPECIFICATIONS
Performance
Measurement range:
-250...2500 Pa
Accuracy (from applied pressure):
Pressure < 125 Pa = 1 % + ±2 Pa
Pressure > 125 Pa = 1 % + ±1 Pa
(Including: general accuracy, linearity,
hysteresis, long term stability and repetition error)
Input accuracy:
Temperature: ±0.25 °C typical @ 25 °C + accuracy of
external transmitter
Humidity: ±0.5 % rH typical @ 25 °C + accuracy of
external transmitter
Overpressure:
Proof pressure: 25 kPa
Burst pressure: 30 kPa
Zero point calibration:
Manual pushbutton or via Modbus
Response time:
1...20 s selectable via menu
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, least significant bit sent
first
1 bit for parity
1 stop bit
Baud rate: selectable in configuration
Modbus address: 1−247 addresses selectable in
configuration menu
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units:
Selectable via menu (Pa, mbar, inchWC, mmWC, psi)
Measuring element:
MEMS, no flow-through
Environment:
Operating temperature: -20...50 °C
Temperature compensated range 0...50 °C
Storage temperature: -40...70 °C
Humidity: 0 to 95 % rH, non-condensing
Physical
Dimensions:
Case: 102 x 71.5 x 36 mm
Weight:
150 g
Mounting:
2 each 4.3 mm screw holes, one slotted
Materials:
Case: ABS
Lid: PC
Pressure inlets: Brass
Protection standard:
IP54
Display:
2-line display (12 characters/line)
Line 1: pressure measurement
Line 2: relative humidity and temperature (if external
measurements are connected)
Electrical Connections:
4+4 spring load terminals, max 1.5 mm
2
Cable entry: M20
Pressure fittings:
Male ø 5.2 mm
+ High pressure
- Low pressure
Electrical
Supply voltage:
24 VAC or VDC ± 10 %
Power consumption:
< 1.3 W
Output signal:
via Modbus
Input signals:
Temperature input: 0−10 V or NTC10k, Pt1000,
Ni1000/(-LG)
RH input: 0−10 V
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
INTRODUCTION
APPLICATIONS
WARNING
RoHS
COMPLIANT
