WM33 & 52

Relative Humidity and Temperature Transmitter, Multi Unit

Wall-mounted units that have the ability to display and provide an output signal of % RH, dew point or absolute humidity and temperature. The WM Series offers excellent measurement accuracy and stability wherever a wall-mounted sensor is required.

Product Features

WM33 is designed for low cost HVAC applications
WM52 has digital technology and is designed for accurate measurements in a controlled environment
Easy to re-calibrate to maintain high accuracy

Technical Specification

Performance
Measurement Range (RH)	0-100% RH
Measurement Range (T)	-20 to +80°C / -4 to +176°F
Accuracy at 23°C / 73°F Humidity	WM52: <±2% RH (10–90% RH) WM33: <±3% RH (30–80% RH)
Accuracy at 23°C / 73°F Temperature	WM52: ±0.2°C (-10 to +50°C) / ±0.36°F (+14 to +122°F) WM33: ±0.3°C (+5 to +40°C) / ±0.54°F (+41 to +104°F)
Stability - RH Sensor	<±1% RH/year
Response Time - RH Sensor	<10 sec typical without filter (for 90% of the step change)
Electrical output/input
Output Signal	4–20 mA, 0–1, 0–5, 0–10 VDC
Supply Voltage	14–30 VDC, 5–30 VDC (0–1 V & mA output)
Operating conditions
Operating humidity Probe, housing, storage	5–95% non-condensing
Operating temperature Probe, Housing Storage	-30 to +85°C / -22 to +185°F -40 to +85°C / -40 to +185°F
PRT
Measurement Range	Pt100/1000 -50 to +200°C / -58 to +392°F
Accuracy	Pt100/1000: ±0.15%
Mechanical specification
Housing Material	Moulded polymer housing
Weight	82g / 2.89oz
Electrical Connections	Screw Terminals
Alternative outputs
Dew Point	-40 to +60°C / -40 to +140°F
Absolute Humidity	0–200 g/m³ / 0 - 87.4gr/ft³