Temperature & Humidity Transmitters · RHT DM Series
RHT DM Duct-Mount Temperature & Humidity Transmitter
Model RHT150 DM / RHT300 DM / RHT400 DM
Duct-mount temperature and humidity transmitters with stainless-steel probe in 150, 300 or 400 mm length.
- Probe
- 150 / 300 / 400 mm SS
- Outputs
- 4–20 mA / 0–10 V / RS485
- Supply
- 12–30 VDC
- Protection
- IP54
Overview
The POLWAX RHT series duct-mounted temperature and humidity transmitters are designed for continuous measurement of air temperature and relative humidity in ventilation ducts, HVAC systems and industrial air-handling applications. They combine a temperature sensing element and a capacitive humidity sensing element with microprocessor-based signal processing.
Choose the stainless-steel probe length — 150 mm (RHT150), 300 mm (RHT300) or 400 mm (RHT400) — and the output: 4–20 mA, 0–10 V or RS485 Modbus RTU.
Key features
- Stainless-steel duct probe in three lengths
- 4–20 mA, 0–10 V or RS485 Modbus RTU output
- Capacitive humidity element with microprocessor signal processing
- Temperature drift ≤0.1 °C/year
- Customised ranges available on request
Technical specifications
Measurement ranges & outputs
| Measuring range – temperature | Up to -40…125 °C (version-dependent) |
|---|---|
| Measuring range – humidity | 0…100 % |
| Measuring units | °C / °F & % RH |
| Temperature drift | ≤0.1 °C/year |
| Output | 4-20 mA / 0-10 V / RS485 Modbus RTU |
Power supply & connectivity
| Supply voltage | 12 VDC to 30 VDC; maximum consumption 70 mA ± 10 % @ 24 Vdc |
|---|
Installation & environment
- Duct mounting with stainless-steel probe; SS adaptor included with RHT300 and RHT400.
| Mounting | Duct mount with SS probe |
|---|---|
| Probe length | RHT150: 150 mm · RHT300: 300 mm · RHT400: 400 mm |
| Protection standard | IP54 |
| Operating temperature | -20 °C to +60 °C |
| Storage temperature | -40 °C to +85 °C |
| Operating humidity | 0–95 % RH (non-condensing) |
| Media compatibility | Air, non-combustible, non-corrosive gases |
Order code
| Code | Option |
|---|---|
| Output 00 | 0-10 V |
| Output 01 | RS485 |
| Output 02 | 4 - 20 mA |
| Length 101 | 150 mm |
| Length 102 | 300 mm |
| Length 103 | 400 mm |
Example: RHT -01-00-00-00-102. Customised range available on request.
Specifications are subject to change. Please check the current datasheet or ask our team before ordering.
Applications & industries
Scope of supply
- Calibration certificate
- GUI software
- SS adaptor (RHT300 / RHT400)
- Manual
Product enquiry
Request a quote for RHT DM Duct-Mount Temperature & Humidity 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
All transmitters
ClimaTRANS
ClimaTRANS RHT100 Temperature & Humidity Transmitter
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
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
DPT Series
DPT50 WM High-Precision Differential Pressure Transmitter
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
RHT210 / RHT211 Transmitter with External Sensor
Model RHT210 TR / RHT210 ES / RHT211 TR
Temperature and humidity transmitter with external stainless-steel probe and filter, with or without display.
- Probe
- 150 mm SS with SS filter
- Outputs
- 4–20 mA, RS485 / 0–10 V opt.
- Supply
- 24 VDC
- Size
- 75 × 35 × 75 mm
Applications: HVAC & ducts · Clean rooms · Storage & warehouses