WM261

 Relative Humidity Transmitter
The WM261 transmitter performs measurement, conversion, and analogue transmission of relative humidity and temperature. These two parameters are transmitted to remote receivers via an analogue signal. WM261 transmitters have a sensor/converter.







Product Features

  • Scale configurable on request: 0–50°C, 0–100°C, -20 to +80°C,
    -30 to +20°C, -30 to +70°C
  • Output signal configurable on request: current/voltage depending on version
  • Humidity output signal linearised and compensated from 0 to 60°C via digital processing
  • On request, linearisation for a specific isotherm
WM261

Technical Specification
PERFORMANCE
Measurement Range (RH) 0-100% RH
Measurement Range (T)-Configurable on Request 0 to +50°C
0 to +100°C
-20 to +80°C
-30 to +20°C
-30 to +70°C
Accuracy RH @ 23°C <±2% RH (5-95% RH)
Accuracy T @ 23°C Pt100 Ω 1/3 DIN direct ±0.2°C
Current output ±0.3°C
Stability - RH Sensor <±1% RH/year
Response Time <10 sec typical (for 90% of the step change)
ELECTRICAL INPUT/OUTPUT
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 100 Ω 1/3 DIN direct Pt100
0–1 V, 0–5 V, 0–10 V
Supply Voltage Output 4–20mA: E = 12–30 VDC
Output 0–10V: E = 15–30 VDC
Output 0–5V: E = 10–30 VDC
Output 0–1V: E = 8–30 VDC
Load Resistance Output 4–20mA: Rload < (Uv-9)/0.02
Output 0–10V: R > 10 k Ω
Output 0–5V: R > 5 k Ω
Output 0–1V: R > 1 k Ω
Current Consumption Analogue loops 2 x 20mA max
OPERATING CONDITIONS
Operating Temperature Measurement head: -30 to +85°C
Housing: -30 to +70°C
Storage: -40 to +70°C
Operating Humidity Sensing element: 0–100% RH (non-condensing)
Housing: 0–98% RH (non-condensing)
Storage: 0–98% RH (non-condensing)
MECHANICAL SPECIFICATIONS
Ingress Protection Sensor IP65
Housing Material PPO
Electrical Connections Screw terminals, tightening torque 1.5mm2 max
Output via wire to wire pitch from 3.5 to 6 mm diameter
Dimensions Housing: 80 x 80 x 34 mm
Probe: L=85mm, ø12mm
Weight 100g