G. Lufft Mess- und Regeltechnik GmbH

- Model WS300-UMB - Smart Weather Sensor



Compact all-in-one weather sensor for measurement of temperature, relative humidity 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 and air pressure. One external temperature or rain sensor is connectable.

  • Parameters measured: Temperature, relative humidity, air pressure
  • Measurement technology: NTC/T, Capacitive/RH, MEMS capacitive/Pressure
  • Product highlights: Compact all-in-one weather sensor, low power, heater, aspirated radiation shield, maintenance-free operation, open communication protocol
  • Interfaces: RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and optional SDI-12

Advantages of the Smart Weather Sensor WS300
  • All-in-one housing concept of a compact weather sensor combining several measurement parameters in one housing with only one cable connection
  • 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
  • Integrated heater that can be switched on if there is danger of frost

The robust and maintenance-free smart weather sensor WS300 is designed for professional meteorological applications in all climate zones. It delivers reliable data, even in extreme ambient conditions.

Examples of use:

  • Weather observation for road and traffic control systems
  • Automatic weather station / Automatic weather sensor (AWS)
  • PV-Monitoring / Solar Monitoring on photovoltaic farms
  • Hydro-meteorological stations
  • Weather observation for building automation
  • Weather stations at airports, marinas and onboard ships
  • Integration into various other systems/solutions, where environmental data is needed...


  • Dimensions: Ø approx. 150 mm, height approx. 223 mm
  • Weight: Approx. 1 kg
  • Interface: RS485, 2 - wire, half - duplex
  • Power supply: 4...32 VDC
  • Operating temperature: -50...60 °C
  • Operating rel. humidity: 0...100 % RH
  • Cable length: 10 m
  • Protection level housing: IP66
  • Mast mounting suitable for: Mast diameter 60 - 76 mm


  • 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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