WM291

 Digital Relative Humidity & Temperature Transmitter, Wall Mount
The WM291 relative humidity transmitter includes the interchangeable Hygrosmart module. The interchangeable module lets you recalibrate the transmitter simply by replacing the sensor head with the Hygrosmart module. As a result, maintenance costs are greatly reduced and down-time is minimized.






Product Features

  • Three outputs
  • Analogue and digital output standard
  • Based on the interchangeable Hygrosmart module
  • Analogue output signals selectable through software
  • Metric or US measurement units selectable through software
  • Available with calculated absolute humidity, dew-point, frost point, mixing ratio or specific enthalpy output
 WM291

Technical Specification
Performance
Measurement Range (RH) 0-100% RH
Measurement Range (T) -30 to +70°C
Accuracy at 23°C
Humidity		 <±2% RH (5-95% RH)
Accuracy at 23°C
Temperature		 ±0.4°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
0–20 mA, 4–20 mA, RS485
Supply Voltage 15 - 27 V AC / 18 - 38 V DC
Load Resistance Current output: R ≤ 500 Ω
Power Consumption 1.7 W
Operating conditions
Operating Temperature
   Probe
   Housing
   Storage
-30 to +85°C
-20 to +70°C
-30 to +70°C
Mechanical specification
Ingress Protection Sensor IP65 (NEMA 4 level)
Housing Material
   Housing
   Probe
Aluminium die casting
Delrin
Dimensions
   Housing
   Probe
120 x 120 x 49.5mm
L=100mm, ø19mm
Weight 450g
Electrical Connections Screw terminals
Display Resolution LCD, 2 lines x 16 characters