HygroSmart WM Series  HygroSmart

Advanced Wall Mount Relative Humidity & Temperature Transmitters

The WM Series advanced wall mount transmitters are designed to reliably and accurately measure moisture and temperature in a wide variety of industrial and process applications.

These rugged and flexible transmitters feature the new generation HygroSmart I7000XP interchangeable sensor — minimizing downtime and reducing maintenance costs.

Product Features

  • Accuracy ±1.25% RH
  • Calculated hygrometric outputs
  • Flexible analog output configurations
  • Interchangeable sensor assembly for rapid maintenance
  • Digital RS485 ModBus multidrop output
  • Optional integral LCD display
  • Rugged heavy industrial housing
  • Customer configuration software for flexibility
  • Traceable 5-point calibration certificate
  • Operating temperature –40 to +85°C

Click here to download Digicor 2 Configuration Kit Application Software

This single application software provides customers the following features..
  • Enables reconfiguration of any measured or calculated variable within the transmitter
  • Provides a simple data logging software
  • Processes logged data in a useable Windows based spreadsheet

It is applicable to all 280/290 Transmitter variants as detailed below

WM281/WM291 Advanced Wall Mount Relative Humidity & Temperature Transmitter
DT282/DT292 Advanced Duct Mount Relative Humidity & Temperature Transmitter
DT284/DT294 Advanced Duct Mount Relative Humidity & Temperature Transmitter
WR283/WR293 Advanced Remote Probe Relative Humidity & Temperature Transmitter
PR285 Pressurized Remote Probe Relative Humidity & Temperature Transmitter



Technical Specification

Products WM281-XP WM291-XP Display
Performance Specifications
RH measurement range 0 to 100% RH
RH accuracy @ 23°C ±1.25% RH (5 to 95% RH)
RH thermal coefficient <0.03% RH/°C typical
RH measurement response time <10 seconds
RH element H8000
RH long term stability ±1% RH per year
Temperature measurement range –40 to +85°C
Temperature accuracy ±0.2°C
Temperature analog output accuracy ±0.2°C pro-rata per 100°C output signal span
Temperature resolution 0.01°C
Temperature technology PT100 1/3 DIN
Calibration Traceable 5-point calibration certificate
Electrical Specifications
Output signals 0–1 V, 0–5 V, 0–10 V, 4–20 mA, 0–20 mA
Digital output signal RS485 ModBus RTU 2-wire
mA load resistance Max 500 Ω over voltage supply range
Supply voltage range 15 to 21 V AC or 18 to 30 V DC
Power consumption 1.7 W max
Calculated 3rd output scales/range
Dew point:–40 to +100°C
Mixing ratio:0 to 500 g/kg
Absolute humidity:0 to 600 g/m3
Specific enthalpy:0 to 1500 KJ/kg
Frost point: –50 to +10°C
CE conformity2004/108/EC, 94/9/E
Communication kit (optional) Digicor2 280/290 software, USB to RS485 interface cable (Digicor2-CK-01)
Display Specifications
Display type LCD, 2 lines x 16 characters
Display configuration Digicor2 communication kit and display keypad
Display configuration variables Contrast, temperature averaging, RH averaging, temperature units
Display configuration output variables Output RH signal, output temperature signal, calculated 3rd output, ModBus set-up
Operating Specifications
Operating temperature
Probe: –40 to +85°C
Housing:–30 to +70°C
Storage:–40 to +70°C
Mechanical Specifications
Ingress protection IP65 (NEMA 4 level)
Housing:Aluminum die casting
Filter assembly:Stainless steel sintered filter
Stainless steel sintered filter with Teflon
Slotted Delrin cap with stainless steel mesh filter
Slotted Delrin cap with PTFE filter
Probe:L=100mm, ø19mm
Housing:120 x 120 x 49.5mm
Weight 450g (approx)
Electrical connections Internal screw terminals

Related Products

WR Series HygroSmart WR Series
Advanced ∅12mm remote probe, relative humidity and temperature transmitter for higher temperature applications. Voltage, current loop outputs of RS485 Modbus RTU outputs
PR285 HygroSmart PR Series
Advanced pressurized remote probe relative humidity transmitter for high temperature, pressurized applications up to 30bar. Voltage, current loop outputs or RS485 Modbus RTU outputs.
DT Series HygroSmart DT Series
Advanced ∅12mm or ∅19mm duct mount relative humidity and temperature transmitter for high temperature applications. Voltage, current loop or RS485 Modbus RTU outputs. Optional integrated display.
I7000XP HygroSmart I7000XP Interchangeable Sensor
Interchangeable sensor for relative humidity and temperature. With voltage, PT100 and I2C outputs.