WM261

 Relative Humidity Transmitter
The WM261 has been developed for high precision measurement of relative humidity and temperature. This transmitter is available with a range of outputs.








Product Features

  • Designed for accurate measurement in a controlled environment
  • Output signal configurable on request
  • Linearization for a specific isotherm on request
WM261

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
<±2% RH (5–95% RH)
Accuracy at 23°C / 73°F
Temperature
Pt100 1/3DIN direct ±0.2°C / ±0.36°F
Current output ±0.3°C / ±0.54°F
Stability - RH Sensor <±1% RH/year
Response Time <10 sec typical (for 90% of the step change)
Electrical output/input
Output Signal (RH)
Configurable on Request
4–20 mA
0–1 V, 0–5 V, 0–10 V
Output Signal (T)
Configurable on Request
4–20mA
3-wire 1/3 DIN Pt100 direct
0–1 V, 0–5 V, 0–10 V
Supply Voltage
Output 4–20 mA:V + = 12–30 VDC
Output 0–10 V:V + = 15–30 VDC
Output 0–5 V:V + = 10–30 VDC
Output 0–1 V:V + = 8–30 VDC
Load Resistance
Output 4–20 mA:Rload< (Uv-9)/0.02
Output 0–10 V:R > 10 kΩ
Output 0–5 V:R > 5 kΩ
Output 0–1 V:R > 1 kΩ
Current Consumption 2x20 mA max
Operating Conditions
Operating Humidity
   Sensing element
   Housing, Storage

0–100% RH (Non-condensing)
0–98% RH (Non-condensing)
Operating Temperature
   Measurement head
   Housing
   Storage

-30 to +85°C / -22 to +185°F
-30 to +70°C / -22 to +158°F
-40 to +70°C / -40 to +158°F
Mechanical specification
Ingress Protection Sensor IP65
Housing Material PPO
Dimensions
   Housing:
   Probe:

880 x 80 x 34mm / 3.15 x 3.15 x 1.34"
L=85mm, ø12mm / L=3.35”, ø0.47”
Electrical Connections Screw terminals
Weight 100g / 3.53oz