WM281

 Digital Relative Humidity/Temperature Transmitter for Wall Mounting
WM281 relative humidity transmitters include 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 machine down time is minimized.






Product Features

  • Humidity and temperature output signal: selectable through software
  • Digital output: RS485 (MODBUS)
  • Protection: IP 67
  • Interchangeable HYGROSMART module
  • Linearised and temperature compensated humidity measurement
WM281

Technical Specification
PERFORMANCE
Measurement Range (RH) 0-100% RH
Measurement Range (T) -30 to +70°C
Accuracy RH @ 23°C <±2% RH (5-95% RH)
Accuracy T @ 23°C ±0.4°C (-10 to +50°C)
Stability - RH Sensor <±1% RH/year
Response Time - RH Sensor <10 sec typical (for 90% of the step change)
ELECTRICAL INPUT/OUTPUT
Output 0-1, 0-5, 0-10 VDC
0–20mA, 4–20mA (3 wires) RS485
Supply Voltage 15 ≤ VAC ≤ 27
18 ≤ VDC ≤ 38
Load Resistance Current output: R ≤ 500Ω
Current Consumption 1.7 W
OPERATING CONDITIONS
Operating Temperature Probe: -30 to +85°C
Housing: -30 to +70°C
Storage: -40 to +70°C
Operating Humidity
Probe: 0–100% RH
Housing: 0–100% RH
Storage: 0–100% RH
MECHANICAL SPECIFICATIONS
Ingress Protection Sensor IP67
Material Housing: Aluminium die casting
Probe: Delrin
Electrical Connections Screw terminals
Dimensions Housing: 120 x 120 x 49.5 mm
Probe: L=100mm, ø19mm
Weight 450g