Copyright HK Instruments 2014
www.hkinstruments.fi
Installation version 1.0 2014
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-Dual-MOD Series
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 an local codes to assure that the
installation will be functional and safe. Use only experienced
and knowledgeable technicians to install this device.
SPECIFICATIONS
INTRODUCTION
Thank you for choosing an HK Instruments DPT-Dual-MOD se-
ries differential pressure transmitter. DPT-Dual-MOD combines
two differential pressure transmitters into one device. It offers a
possibility to measure pressure from two different points. It has a
Modbus interface and an Input terminal. When using the Input ter-
minal, temperature transmitters can be replaced with temperature
sensors. As a result you will save in costs of the devices and in the
installation costs.
APPLICATIONS
DPT-Dual-MOD series devices are commonly used in HVAC/R
systems for:
• fan, blower and filter monitoring
• pressure and flow monitoring
• valve and damper control
• pressure monitoring in cleanrooms
SPECIFICATIONS
Performance
Accuracy
(from applied pressure):
±1.5 % + 1 Pa
(Including: general accuracy, temperature drift, linearity,
hysteresis, long term stability and repetition error)
Response time:
1...20 s selectable via menu
Max pressure:
400 kPa
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
Zero point calibration options:
• Manual pushbutton autozero
• Via Modbus write coil
Response Time:
0.8 sec, 2.0 sec, or 10 sec selectable in configuration
menu
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units on display:
Selectable via menu (Pa, mbar, inchWC, mmWC, psi)
Measuring element:
Piezoresistive
Environment:
Operating temperature: -10...+50
°C
Storage temperature: -20...+70 °C
Humidity: 0 to 95 % rH
Physical
Dimensions:
Case:
102.0 x 71.5 x 36.0 mm
Weight:
150 g, with accessories 290 g
Mounting:
2 each 4.3 mm screw holes, one slotted
Materials:
Case: ABS
Lid: PC
Protection standard:
IP54
Display
:
2-line display (12 characters/line)
Line 1: active measurement, inlet A
Line 2: active measurement, inlet B
Electrical Connections:
4+3 spring load terminals, max 1.5 mm
2
Cable Entry: M20
Pressure connections:
Male 5,0 mm and 6,3 mm
Electrical
Supply voltage:
24 VAC or VDC ± 10 %
Power consumption:
< 1.3 W
Output signal:
via Modbus
Conformance
Meets requirements for CE marking:
EMC directive 2004/108/EC
RoHS Directive 2002/95/EC
