Copyright HK Instruments 2020
www.hkinstruments.fi
Installation version 7.0 2020
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-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-MOD series differ-
ential pressure transmitter. The DPT-MOD series is intended for use
in commercial environments. DPT-MOD is a multifunctional trans-
mitter for measuring volume flow, velocity, and static and differen-
tial pressure. The measurements can be read and the configuration
done via Modbus communication. DPT-MOD requires less wiring
than the traditional 3-wire transmitters because multiple devices
can be connected on serial line. DPT-MOD can also be used with
several different measurement probes such as FloXact™ or pitot
tube, and air dampers.
The DPT-MOD series is comprised of DPT-MOD-2500 and DPT-
MOD-7000 with measurement ranges of -250...2500 Pa and
-250...7000 Pa respectively. All models come with display and op-
tional autozero calibration.
DPT-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
• air flow monitoring across centrifugal fans and blowers
• in-duct air flow or pressure monitoring
• measuring air flow or pressure in VAV applications
SPECIFICATIONS
Performance
Accuracy (at 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
(Accuracy specifications include: general accuracy,
linearity, hysteresis, long term
stability, and repetition error)
Overpressure:
Proof pressure: 25 kPa
Burst pressure: 30 kPa
Zero point calibration:
Automatic autozero, manual pushbutton or via Modbus
register
Response time:
1.0−20 s, selectable via menu or via Modbus register
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
Pressure units (select via menu):
Pa, kPa, mbar, inWC, mmWC
Flow units (select via menu):
Volume: m
3
/s, m
3
/hr, cfm, l/s
Velocity: m/s, ft/min
Measuring element:
MEMS, no flow-through
Environment:
Operating temperature: -20...50 °C,
-40C models: -40...50°C
Models with autozero calibration: -5...50 °C
Temperature compensated range 0...50 °C
Storage temperature: -40...70 °C
Humidity: 0 to 95 % rH, non condensing
Physical
Dimensions:
Case: 90.0 x 95.0 x 36.0 mm
Weight:
150 g
Mounting:
2 each 4.3 mm screw holes, one slotted
Materials:
Case: ABS
Lid: PC
Duct connectors: ABS
Tubing: PVC
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 mm
2
(12–24 AWG)
Cable entry:
Strain relief: M16
Knockout : 16 mm
Pressure fittings
Male ø 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
APPLICATIONS
INTRODUCTION
WARNING
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
RoHS 2
2011/65/EU
