HK Instruments DPT Series

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INSTALLATION

INSTRUCTIONS

DIFFERENTIAL PRESSURE TRANSMITTERS

DPT-R8 Series

• READ THESE INSTRUCTIONS CAREFULLY BEFORE

ATTEMPTING TO INSTALL, OPERATE OR SERVICE THIS

DEVICE.

• Failuretoobservesafetyinformaonandcomplywith

instrucons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

insulaonratedforfulldeviceoperangvoltage.

• Toavoidpotenalreand/orexplosiondonotuseinpotenally

ammableorexplosiveatmospheres.

• Retaintheseinstruconsforfuturereference.

• Thisproduct,wheninstalled,willbepartofanengineered

systemwhosespecicaonsandperformancecharacteriscs

arenotdesignedorcontrolledbyHKInstruments.Review

applicaonsandnaonalandlocalcodestoassurethatthe

installaonwillbefunconalandsafe.Useonlyexperiencedand

knowledgeabletechnicianstoinstallthisdevice.

SPECIFICATIONS

ThankyouforchoosinganHKInstrumentsDPTseriesdierenal

pressuretransmier.TheDPTseriesisintendedforuseincommer-

cial environments. It is designed with six unit selecons (Pa, kPa,

mbar,inchWC,mmWC,psi)andeighteldselectablemeasurement

ranges (unidireconal and bi-direconal) to meet yourapplicaon

requirements. The DPT-R8 series is comprised of the DPT250-R8

with ranges from 25 Pa to 250 Pa, the DPT2500-R8 with ranges

from 100 Pa to 2500Pa, and the DPT7000-R8 with ranges from

1000Pato7000Pa.

All DPT-R8 series dierenal pressure transmiers are available

withdisplayandautozerocalibraon.

DPT-R8seriesdevicesarecommonlyusedinHVAC/Rsystemsfor:

•fan,blowerandltermonitoring

•pressureandowmonitoring

•valveanddampercontrol

•pressuremonitoringincleanrooms

SPECIFICATIONS

Performance

Accuracy (from applied pressure):

Models250and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repeonerror)

Thermal eects:

Temperaturecompensated0...50°C

Overpressure:

Proofpressure:25kPa

Burstpressure:30kPa

Zero point calibraon:

Automacautozeroormanualpushbuon

Response me:

8.0sor0.8s,selectableviajumper

Technical Specicaons

Media compability:

Dryairornon-aggressivegases

Measuring units:

Pa,kPa,mbar,inchWC,mmWC,psi,selectablevia

jumper

Measuring element:

MEMS,noow-through

Environment:

Operangtemperature:-20...50°C,

-40Cmodel:-40...50°C

AZ-model:-20...50°C,

Modelswithautozerocalibraon:-5...50°C

Storagetemperature:-40...70°C,

-40Cmodel:-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

Mounng:

2each4.3mmscrewholes,onesloed

Materials:

Case:ABS

Lid:PC

Ductconnectors:ABS

Tubing:PVC

Protecon standard:

IP54

Display (Oponal)

2-linedisplay(12characters/line)

Line1:acvemeasurement

Line2:units

Electrical connecons:

4-screwterminalblock

Wire:0.2–1.5mm

(12–24AWG)

Cableentry:M16

Pressure ngs:

Maleø5,0mmand6,3mm

+Highpressure

−Lowpressure

Electrical

Voltage:

Circuit:3-wire(VOut,24V,GND)

Input:24VACorVDC,±10%

Output:0–10V

Powerconsumpon:<1.0W,

-40Cmodel:<4.0Wwhen<0°C

Resistanceminimum:1kΩ

Current:

Circuit:3-wire(mAOut,24V,GND)

Input:24VACorVDC,±10%

Output:4–20mA

Powerconsumpon:<1.2W,

-40Cmodel:<4.2Wwhen<0°C

Maximumload:500Ω

Minimumload:20Ω

Conformance

MeetstherequirementsforCEmarking:

EMCDirecve2014/30/EU

RoHSDirecve2011/65/EU

WEEEDirecve2012/19/EU

INTRODUCTION

APPLICATIONS

WARNING

COMPANY WITH

MANAGEMENT SYSTEM

CERTIFIED BY DNV GL

= ISO 9001 = ISO 14001 =

RoHS 2

2011/65/EU

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Summary

DPT-R8 Series Specifications

Performance Specifications

Details accuracy, thermal effects, overpressure, zero point calibration, and response time.

Environmental Specifications

Covers operating and storage temperatures, and humidity.

Physical Specifications

Includes dimensions, weight, mounting details, and materials used.

Electrical Specifications

Outlines voltage, current output options, power consumption, and load resistance.

Conformance Standards

Lists compliance with CE marking directives and ISO certifications.

Schematics and Dimensional Drawings

Installation and Wiring

Mounting the Device

Step 1: Select mounting location, mark screw holes, and mount with appropriate screws.

Wiring Diagrams

Step 2: Connect wires according to 0-10 V or 4-20 mA output diagrams.

Configuration and Calibration Procedures

Measurement Unit Selection

Step 4: Select desired measurement unit (Pa, kPa, etc.) using jumpers and zero button.

Measurement Range Selection

Step 5: Determine range number from chart and install jumpers J1, J2, J3.

Response Time Selection

Step 6: Install or remove jumper J4 to select response time (0.8s or 8.0s).

Special Operation and Disposal

Cold Environment Operation

Instructions for operating the device below 0 °C.

Recycling and Disposal

Guidance on recycling installation parts and disposing of decommissioned devices.

The HK Instruments DPT-R8 series differential pressure transmitter is a user-friendly measuring device designed for commercial HVAC/R systems. It offers versatile functionality with six selectable units (Pa, kPa, mbar, inchWC, mmWC, psi) and eight field-selectable measurement ranges (unidirectional and bi-directional) to meet diverse application requirements. The series includes models like the DPT250-R8 (25 Pa to 250 Pa), DPT2500-R8 (100 Pa to 2500 Pa), and DPT7000-R8 (1000 Pa to 7000 Pa). All DPT-R8 series transmitters are available with an optional display and autozero calibration.

Function Description

The DPT-R8 series devices are commonly used for various monitoring and control applications in HVAC/R systems:

Fan, blower, and filter monitoring: Ensures optimal performance and identifies potential issues.
Pressure and flow monitoring: Provides accurate data for system analysis and control.
Valve and damper control: Facilitates precise regulation of airflow and pressure.
Pressure monitoring in cleanrooms: Maintains critical environmental conditions.

Important Technical Specifications

Accuracy (from applied pressure):
- Models 250 and 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.
- This includes general accuracy, linearity, hysteresis, long-term stability, and repetition error.
Thermal effects: Temperature compensated from 0 to 50 °C.
Overpressure: Proof pressure: 25 kPa; Burst pressure: 30 kPa.
Zero point calibration: Automatic autozero or manual pushbutton.
Response time: Selectable via jumper for 8.0 s or 0.8 s.
Media compatibility: Dry air or non-aggressive gases.
Measuring units: Pa, kPa, mbar, inchWC, mmWC, psi, selectable via jumper.
Measuring element: MEMS, no flow-through.
Environment:
- Operating temperature: -20 to 50 °C (-40C model: -40 to 50 °C; AZ-model: -20 to 50 °C; Models with autozero calibration: -5 to 50 °C).
- Storage temperature: -40 to 70 °C (-40C model: -40 to 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: Two 4.3 mm screw holes, one slotted.
Materials: Case: ABS; Lid: PC; Duct connectors: ABS; Tubing: PVC.
Protection standard: IP54.
Display (Optional): 2-line display (12 characters/line) showing active measurement and units.
Electrical connections: 4-screw terminal block; Wire: 0.2-1.5 mm² (12-24 AWG); Cable entry: M16.
Pressure fittings: Male Ø 5.0 mm and 6.3 mm.
Electrical (Voltage):
- Circuit: 3-wire (V Out, 24 V, GND).
- Input: 24 VAC or VDC, ±10%.
- Output: 0-10V.
- Power consumption: <1.0 W (-40C model: <4.0 W when <0 °C).
- Resistance minimum: 1 kΩ.
Electrical (Current):
- Circuit: 3-wire (mA Out, 24 V, GND).
- Input: 24 VAC or VDC, ±10%.
- Output: 4-20 mA.
- Power consumption: <1.2 W (-40C model: <4.2 W when <0 °C).
- Maximum load: 500 Ω; Minimum load: 20 Ω.
Conformance: Meets CE marking requirements (EMC Directive 2014/30/EU, RoHS Directive 2011/65/EU, WEEE Directive 2012/19/EU).

Usage Features

Installation: The device can be mounted on a duct, wall, or panel. Users mark screw holes using the device as a template and secure it with appropriate screws. Wiring involves routing cables through a strain relief and connecting them to the terminal block, ensuring proper grounding for CE compliance.
Configuration (Step 3):
1. Measurement Unit Selection (Step 4): Install a jumper on J5, push the zero button to cycle through units (Pa, kPa, mbar, inchWC, mmWC, psi) on the display, then remove the jumper when the desired unit is visible.
2. Measurement Range Selection (Step 5): Determine the range number from Chart 1 based on the model and selected unit. Then, use Chart 2 to identify the corresponding jumper settings for J1, J2, and J3 and install them.
3. Response Time Selection (Step 6): Install a jumper on J4 for an 8.0-second response time or remove it for a 0.8-second response time. A longer response time helps smooth out unstable pressure fluctuations in airflow applications.
4. Zeroing the Device (Step 7):
  - Manual Pushbutton Zero Point Calibration: Disconnect pressure tubes, push the zero button until the LED turns on and the display reads "zeroing." The device automatically zeros, and the LED turns off when complete. Reinstall pressure tubes with positive to "+" and negative to "-".
  - Autozero Calibration (-AZ models): If the device includes an autozero circuit, no manual action is required. The autozero function electronically adjusts the transmitter zero at predetermined 10-minute intervals, eliminating drift due to thermal, electronic, or mechanical effects. During the 4-second adjustment period, output and display values freeze to the latest measured value.
Cold Environment Operation (-40C Model): The lid must be closed when operating below 0 °C. The display requires 15 minutes to warm up if the device starts below 0 °C. Note that power consumption increases below 0 °C.

Maintenance Features

Autozero Calibration: Transmitters equipped with autozero calibration are virtually maintenance-free, as the system automatically compensates for drift.
Warranty: HK Instruments provides a five-year warranty covering material and manufacturing defects. Defective products will be repaired or replaced at the seller's discretion. The warranty does not cover damages from accidents, improper handling, abnormal use, or unauthorized modifications.
Recycling/Disposal: Parts left over from installation should be recycled according to local instructions. Decommissioned devices should be taken to a recycling site specializing in electronic waste.