RM33 & 52 HVAC Room Mount, Relative Humidity and Temperature Transmitter

The RM series of relative humidity and temperature transmitters offers a comprehensive range of output signals and measurement ranges. The transmitters are housed in a wall mounting enclosure making these instruments ideal for HVAC and building management applications.

Product Features

  • Designed for low cost HVAC applications
  • Quick installation: electrical rear connection with screw terminals
  • Long term stability
RM33 & 52

Technical Specification

Measurement Range (RH) 0-100% RH
Measurement Range (T) 0 to +50°C
Accuracy at 23°C
RM52: <±2% RH (10–90% RH)
RM33: <±3% RH (30–80% RH)
Accuracy at 23°C
RM52: ±0.2°C
RM33: ±0.3°C
Temperature Influence ±0.05% RH/°C
Stability - RH Sensor ±1% RH/year
Response Time - RH Sensor <10 sec typical (for 90% of the step change)
Electrical output/input
Output Signal 0–1, 0–5, 0–10 V
4–20 mA (2-wire)
Supply Voltage 14–35 V DC (for 0–5 / 0-10 V output)
4.5–35 V DC (for 0–1 V / 4-20 mA {RH only} output)
14–26 V AC (for all output ranges)
Supply Voltage Influence ±0.01% RH/V typical
Operating conditions
Operating Temperature

0 to +50°C
-40 to +75°C
Measurement Range Pt100/1000: -50 to +200°C
Accuracy Pt100/1000: ±0.15%
Mechanical specification
Ingress Protection N/A
Housing Material White moulded polymer
Dimensions 91 x 91 x 25.5mm
Filter N/A
Weight 85g
Electrical Connections Screw terminals