HK Instruments DPT-IO-MOD Series Installation Instructions

INTRODUCTION
Thank you for choosing an HK Instruments DPT-IO-MOD series dif-
ferential pressure transmitter. The DPT-IO-MOD differential pres-
sure transmitter for air conforms to Modbus over serial line protocol,
using RTU transmission mode and RS485 interface. The digital out-
put signal is sent over Modbus enabling the DPT-IO-MOD to con-
nect directly to a field communications network.
DPT-IO-MOD requires less wiring than traditional 3-wire transmit-
ters, since multiple devices can be connected on serial line.
The DPT-IO-MOD includes an Input terminal that enables reading
of multiple other signals such as temperature or control relays over
Modbus. The Input terminal has two input channels designed to ac-
cept 0−10 V, NTC10k, Pt1000, Ni1000/(-LG), and BIN IN (potential
free contact) signals. For example, DPT-IO-MOD can read values
from one differential pressure measurement point and two tempera-
ture measurement points.
APPLICATIONS
DPT-IO-MOD series devices are commonly used in HVAC/R
systems for:
• fan, blower and filter monitoring
• pressure and flow monitoring
SPECIFICATIONS
• valve and damper control
• pressure monitoring in cleanrooms
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, linearity, hysteresis, long
term stability and repetition error)
Input accuracy:
<0,5%
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 2019
DIFFERENTIAL PRESSURE TRANSMITTERS
DPT-IO-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:
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
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
Line 2: units
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+3 spring load terminals, max 1.5 mm
Cable Entry: M20
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
Input signals:
2 x input (0...10v, NTC10k, Pt1000, NI1000/(-LG), or
BIN IN)
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 8.0 2019