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
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
| 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) |
|---|---|
| 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 units | Pa & mmWC |
| Response time | 500 ms |
| Over pressure | Ranges ≤ 50 mm WC: 9 PSI · 100 to 1000 mm WC: 19 PSI |
| Media compatibility | Air, non-combustible, non-corrosive gases |
General
| Alarm | Buzzer |
|---|---|
| Switch | Digital push button |
Power supply & connectivity
| Communication | RS485 Modbus RTU |
|---|---|
| Supply voltage | 12 - 24 VDC |
| Signal connection | 3 wire |
| Load resistance | 47 to 470 Ω @ 24 VDC |
| Electrical connections | Screw terminals |
Installation & environment
| Process connection | Push-on connection for 3/16" ID tubing |
|---|---|
| Mounting | Panel mounting |
| Enclosure | ABS |
Specifications are subject to change. Please check the current datasheet or ask our team before ordering.
Applications & industries
Scope of supply
- Transmitter
- Calibration certificate
- Manual
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.
- Technical advice on model and options
- Quotation for your quantity
- Datasheets and documentation on request
Related POLWAX products
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DPT20 Differential Pressure Transmitter
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
RHT Series
RHT50 WM Temperature & Humidity Transmitter
Model RHT50 WM
Wall-mount temperature and humidity transmitter with two analogue outputs and RS485 Modbus RTU.
- Accuracy
- ±0.4 °C · ±1.8 % RH
- Outputs
- 4–20 mA / 0–10 V, RS485
- Supply
- 12–30 Vdc
- Size
- 75 × 35 × 75 mm
Applications: Agriculture & greenhouses · Storage & warehouses · Museums & buildings
ClimaTRANS
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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