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

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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

Measurement ranges and 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

General

General specifications
Display	Without Display

Power supply & connectivity

Power supply and 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.

Installation and environment
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

Technical resources