HK Instruments DPT-Dual-MOD Series Installation Instructions

INTRODUCTION
Thank you for choosing an HK Instruments DPT-Dual-MOD series
differential pressure transmitter. DPT-Dual-MOD combines two dif-
ferential pressure transmitters into one device. It offers a possibility
to measure pressure from two different points. It has a Modbus in-
terface and an Input terminal.
The Input terminal enables reading of multiple other signals such as
temperature or control relays over Modbus. The Input terminal has
two input channels designed to accept 0−10 V, NTC10k, Pt1000,
Ni1000/(-LG), and BIN IN (potential free contact) signals. For exam-
ple, DPT-Dual-MOD can read values from one differential pressure
measurement point and two temperature measurement points.
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
DPT-Dual-MOD-AHU can also be used for:
• air flow monitoring across centrifugal fans and blowers
• in-duct air flow monitoring
• VAV applications
SPECIFICATIONS
Performance
Accuracy (from applied pressure):
Model 2500:
Pressure < 125 Pa = 1 % + ±2 Pa
Pressure > 125 Pa = 1 % + ±1 Pa
Model 7000:
Pressure < 125 Pa = 1.5 % + ±2 Pa
Pressure > 125 Pa = 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
Overpressure:
Proof pressure: 25 kPa
Burst pressure: 30 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
Copyright HK Instruments 2017
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-Dual-MOD Series
• READ THESE INSTRUCTIONS CAREFULLY BEFORE
• Failure to observe safety information and comply with
• To avoid electrical shock or damage to equipment, disconnect
• To avoid potential fire and/or explosion do not use in potentially
• Retain these instructions for future reference.
• This product, when installed, will be part of an engineered
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units on display (Selectable via menu):
Pressure: Pa, kPa, mbar, inchWC, mmWC, psi
Flow (AHU model): m /s, m /hr, cfm, l/s, m/s, ft/min
3 3
Measuring element:
MEMS
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
Pressure inlets: Brass
Duct connectors: ABS
Tubing: PVC
Protection standard:
IP54
Display:
2-line display (12 characters/line)
Line 1: active measurement, inlet A
Line 2: active measurement, inlet B
If inputs are selected, the lines show also input
information (for example temperature)
www.hkinstruments.fi
WARNING
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS
DEVICE.
instructions can result in PERSONAL INJURY, DEATH AND/OR
PROPERTY DAMAGE.
power before installing or servicing and use only wiring with
insulation rated for full device operating voltage.
flammable or explosive atmospheres.
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.
Electrical Connections:
4+4 spring load terminals, max 1.5 mm
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 2014/30/EU
RoHS Directive 2011/65/EU
WEEE Directive 2012/19/EU
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
INSTALLATION
INSTRUCTIONS
2
RoHS 2
2011/65/EU
Installation version 6.0 2017