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POLWAX DPT30 Differential Pressure Transmitter

Differential Pressure Transmitters · DPT Series

DPT30 Differential Pressure Transmitter

Model DPT30

Panel-mount differential pressure transmitter, ranges up to 0–700 mm WC, with alarm, 4–20 mA, 0–10 V, RS485 Modbus RTU and relay options.

Range
Up to 0–700 mm WC
Accuracy
±0.5 % FS (≥ 0–25 mm WC)
Outputs
4–20 mA, 0–10 V, RS485, relay
Mounting
Panel mounting
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Overview

The DPT30 extends the DPT20 platform with ranges up to 0–700 mm WC (bi-directional) and additional output options — 4–20 mA, 0–10 V, RS485 Modbus RTU and relay — for HVAC, clean room and industrial applications.

Key features

  • Ranges from 0–10 to 0–700 mm WC, bi-directional
  • Alarm with inbuilt buzzer
  • 4–20 mA, 0–10 V, RS485 Modbus RTU and relay options
  • Configuration via keys
  • Panel mounting

Technical specifications

Measurement ranges & outputs

Measurement ranges and outputs
Measuring ranges (order code)0 - 10 / 0 - 25 / 0 - 50 / 0 - 100 / 0 - 150 / 0 - 200 / 0 - 250 / 0 - 500 / 0 - 700 mm WC (all ranges bi-directional)
Ranges in Pa (product page)0-25Pa, 0-50Pa,0-100Pa,0-250Pa,0-500Pa,0- 1000Pa,0-2000Pa,0-2500Pa,0 -5000Pa,,0-7000Pa
Output options (order code)None, alarm, 0 - 10 V, 4 - 20 mA, relay, RS485
Accuracy (from applied pressure)Ranges ≤ 0 - 10 mm WC: ±1.0 % of FS · ranges ≥ 0 - 25 mm WC: ±0.5 % of FS
Measuring unitsPa & mmWC
Response time500 ms
Over pressureRanges ≤ 50 mm WC: 9 PSI · 100 to 1000 mm WC: 19 PSI
Media compatibilityAir, non-combustible, non-corrosive gases

General

General specifications
AlarmBuzzer
SwitchDigital push button

Power supply & connectivity

Power supply and connectivity
CommunicationRS485 Modbus RTU
Supply voltage12 - 24 VDC
Signal connection3 wire
Load resistance47 to 470 Ω @ 24 VDC
Electrical connectionsScrew terminals

Installation & environment

Installation and environment
Process connectionPush-on connection for 3/16" ID tubing
MountingPanel mounting
Panel cut-outRound (80 mm)
DimensionsFront View: 86 mm, Side View: 35 mm, Back View: 80 mm
EnclosureABS
ProtectionIP54
Operating temperature10°C to 60°C
Storage temperature10°C to 70°C

Specifications are subject to change. Please check the current datasheet or ask our team before ordering.

Scope of supply

  • Transmitter
  • Calibration certificate
  • Manual

Technical resources

DPT30 Differential Pressure Transmitter

Access product datasheets, user manuals, software and technical documentation in your preferred language.

Technical Datasheets

Product enquiry

Request a quote for DPT30 Differential Pressure Transmitter

Tell us about your application — what you need to measure, the range, number of points and where the instrument will be installed. Our team will reply with a recommendation and quotation.

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  • Datasheets and documentation on request

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Model DPT20

Panel-mount differential pressure transmitter for air and non-corrosive gases, ranges up to 0–250 mm WC, with buzzer or 4–20 mA output.

Range
Up to 0–250 mm WC
Accuracy
±0.5 % FS (≥ 0–25 mm WC)
Output
Buzzer or 4–20 mA
Mounting
Panel mounting

Applications: HVAC systems – airflow and filter monitoring · Clean rooms – contamination prevention · Industrial processes – filter and pump monitoring

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Model DPT50 WM / DPT100 WM / DPH100 WM

High-precision differential pressure transmitter for building automation, configurable via USB, with 4–20 mA and RS485 Modbus RTU.

Accuracy
0.25 % / 0.5 % of FS
Outputs
4–20 mA, RS485 / 0–10 V opt.
Config
USB interface
Weight
70 g

Applications: Building automation (HVAC/R) · Air filter monitoring · Fan and air-flow monitoring

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Model RHT100

Industrial temperature and humidity transmitter with TFT display, RS485 Modbus RTU and wall or duct mounting.

Accuracy
±0.3 °C · ±1.8 % RH
Output
RS485 Modbus RTU
Display
TFT
Protection
IP65

Applications: HVAC systems & BMS integration · Cleanrooms & pharmaceutical environments · Warehouses & cold storage

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