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WS304-UMB Smart Weather Sensor - discontinued

Compact all-in-one weather sensor for measurement of temperature, relative humidity, radiation and air pressure.


From the WS product family of professional intelligent measurement transducers with digital interface for environmental applications. Integrated design with ventilated radiation protection for measuring: Air temperature, relative humidity, radiation and air pressure. One external temperature or rain sensor is connectable.

IMPORTANT: WS304-UMB Smart Weather Sensor is discontinued

  • Temperature, relative humidity, radiation and air pressure
  • NTC/T, Capacitive/RH, Tiltable Pyranometer Lufft/Radiation, MEMS capacitive/Pressure
  • Compact all-in-one weather sensor, low power, aspirated radiation shield, maintenance-free operation, open communication protocol
  • RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12

WS304-UMB Smart Weather Sensor is discontinued

Please check the alternative: WS504

Advantages of the Smart Weather Sensor WS304

  • All-in-one housing concept of a compact weather sensor combining several measurement parameters in one housing with only one cable connection
  • Tuiltable pyranometer as part of the sensor unit
  • Built-in data pre-processing, universal interfaces and selectable output protocols
  • Compatible with many commercially available Met/HydroMet dataloggers and PLS systems thanks to an open communication protocol
  • Maintenance-free operation – no moving parts that can wear out
  • Suitable for all climate zones; also for solar-powered automatic meteorological stations
  • Ventilated temperature and humidity measurement according to WMO guidelines

Examples of use of the Smart Weather Sensor WS304

The robust and maintenance-free smart weather sensor WS304 is designed for professional meteorological applications in all climate zones. It delivers reliable data, even in extreme ambient conditions.

Examples of use:

  • PV-Monitoring / Solar Monitoring on photovoltaic farms
  • Hydro-meteorological stations
  • Meteorological reference stations
  • Integration into various other systems/solutions, where these measurement parameters are needed...
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Dimensions Ø approx. 150 mm, Height approx. 377 mm
Weight Approx. 1.5 kg
Interface RS485, 2 - wire, half - duplex
Power supply 4…32 VDC
Power supply 5…11 VDC (electronics with limited precision of measurements)
Power supply 24 VDC +/- 10% (heater)
Power consumption 40 VA (heater)
Operating temperature -50...60 °C (with heater)
Operating rel. humidity 0...100 % RH
Cable length 10 m
Protection level housing IP66
Mast mounting suitable for Mast diameter 60 - 76 mm
Unit W/m²
Accuracy 5 %
Response time (95%) < 1 s
Non-stability(change/year) ±1 %
Non-linearity (0 to 1000 W/m²) ±1 %
Directional error (at 80° with 1000 W/m²) ±20 W/m²
Temperature dependence of sensitivity ±5 % (-10 to +40 °C)
Tilt error (at 1000 W/m²) ±1 %
Spectral range 300...1100 nm
Measuring range 1400 W/m²
Principle NTC
Measuring range -50 ... 60 °C
Unit °C
Accuracy ±0.2 °C (-20...50 °C), otherwise ±0.5 °C (>-30 °C)
Relative humidity
Principle Capacitive
Measuring range 0 ... 100 % RH
Unit % RH
Accuracy ±2 % RH
Air pressure
Principle MEMS capacitive
Measuring range 300 ... 1200 hPa
Unit hPa
Accuracy ±0.5 hPa (0...40 °C)
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