WM291

 Relative Humidity/Temperature Digital Transmitter for Wall Mounting
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

  • Third output optional
  • Analog and digital output standard
  • Based on the interchangeable Hygrosmart module
  • Analog output signals selectable through software
  • Metric or imperial 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 / -22 to +158°F
Accuracy at 23°C / 73°F
Humidity
<±2% RH (5-95% RH)
Accuracy at 23°C / 73°F
Temperature		 ±0.4°C (-10 to +50°C)
±0.72°F (+14 to +122°F)
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 VDC, 0–5 VDC, 0–10 VDC
0–20 mA, 4–20 mA, RS485
Supply Voltage 15 ≤ VAC ≤ 27
18 ≤ VDC ≤ 38
Load Resistance Current output: R ≤ 500 Ω
Power Consumption 1.7 W
Operating conditions
Operating Humidity
   Probe, Housing, Storage
0–100% RH
Operating Temperature
   Probe
   Housing
   Storage
-30 to +85°C / -22 to +185°F
-20 to +70°C / -4 to +158°F
-30 to +70°C / -22 to +158°F
Mechanical specification
Ingress Protection Sensor IP65
Housing Material
   Housing
   Probe
Aluminium die casting
Delrin
Dimensions
   Housing
   Probe
120 x 120 x 49.5mm / 4.72 x 4.72 x 1.94"
L=100mm, ø19mm / L=3.93”, ø0.74”
Weight 450g / 15.87oz
Electrical Connections Screw terminals
Display Resolution LCD, 2 lines x 16 characters