Copyright HK Instruments 2019
www.hkinstruments.fi
Installation version 7.0 2019
INSTALLATION
INSTRUCTIONS
DIFFERENTIAL PRESSURE SWITCHES
DPI 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.
SPECIFICATIONS
Thank you for choosing an HK Instruments DPI series electronic dif
-
ferential pressure switch. The DPI series is intended for use in com
-
mercial environments. It combines the advantages of an electronic
differential pressure switch (on-off relay) and a multi-functional
differential pressure transmitter to meet your application require
-
ments.
The DPI series is comprised of the DPI±500 with bi-directional
measurement ranges from ±100 to ±500 Pa and the DPI2500 with
measurement ranges from 100 to 2500 Pa.
All DPI series devices include one relay, display, manual pushbutton
zero point calibration and span point calibration. Optional features
include a second relay and autozero calibration.
DPI series devices are commonly used in HVAC/R systems for:
• fan, blower and filter monitoring
• staircase pressure monitoring and alarm
• pressure monitoring in cleanrooms
• boiler pressure monitoring and alarm
SPECIFICATIONS
Performance
Accuracy:
±1.5 % (±0.7 %*)
%FS from highest pressure range (including:
general accuracy, temperature drift, linearity, hysteresis,
and repetition error)
*Can be achieved with span point calibration
Long term stability:
Typical 1 year
With autozero: ±1 Pa
Without autozero: ±8 Pa
Thermal effects:
Temperature compensated across the full spectrum of
capability
Overpressure:
Proof pressure: 25 kPa
Burst pressure: 30 kPa
Zero point calibration:
Automatic with autozero (-AZ) circuit or
Manual via menu
Response time:
0.5–10 s, selectable via menu
Technical Specifications
Media compatibility:
Dry air or non-aggressive gases
Measuring units:
Pa, kPa, mmWC, inWC, mbar selectable via menu
Measuring element:
Piezoresistive
Environment:
Operating Temperature:
Without autozero : -10...50 °C
With autozero: -5...50 °C
Storage temperature: -20...70 °C
Humidity: 0 to 95 % rH, non condensing
Physical
Dimensions:
Case: 89 x 86.5 x 37.1 mm
Weight:
150 g
Mounting:
Case: 2 each 4.3 mm holes
Lid: 2 each 4.3 mm holes
Materials:
Case: ABS
Lid: PC
Duct connectors: ABS
Tubing: PVC
Protection standard:
IP54
Touch sensitive buttons on the lid:
Menu, Back, OK, down arrow, up arrow
Display:
3 1/2 digit LCD backlit display
Size: 46.0 W x 14.5 H mm
Electrical connections:
n/out:
Terminal block (24 V, GND, 0–10 V)
Wire: 0.2–1.5 mm
2
(12–24 AWG)
Relay 1:
Terminal block (NC, COM, NO)
Wire: 0.2–1.5 mm
2
(12–24 AWG)
Relay 2:
Terminal block (NC, COM, NO)
Wire: 0.2–1.5 mm
2
(12–24 AWG)
Cable entries:
Strain relief: M16 & M20
Knockout : 16 mm
Knockout : 20 mm
Pressure fittings:
5.2 mm barbed brass
+ High pressure
− Low pressure
Electrical
Circuit: 3-wire (24 V, GND, 0–10 V)
Input:
Without autozero: 21–35 VDC/ 24 VAC, ±10 %
With autozero: 24 VAC or VDC, ±10 %
Output:
Analog: 0–10 V
Relay 1: 250 VAC / 30 VDC / 6 A
Relay 2: 250 VAC / 30 VDC / 6 A
Adjustable switching point and hysteresis
Zero/Span output calibrated within ±0.025 V
Resistance minimum: 1 kΩ
Current consumption:
35 mA + relays (7 mA each) + AZ circuit (20 mA)
+ 0–10 V output (10 mA)
Conformance
Meets requirements for CE marking:
EMC Directive 2014/30/EU
RoHS Directive 2011/65/EU
LVD Directive: 2014/35/EU
WEEE Directive 2012/19/EU
INTRODUCTION
APPLICATIONS
WARNING
COMPANY WITH
MANAGEMENT SYSTEM
CERTIFIED BY DNV GL
= ISO 9001 = ISO 14001 =
RoHS 2
2011/65/EU
