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WS601-UMB Smart Weather Sensor

Make:  Lufft                                                  Model:  WS601-UMB
✅ Wind detection with birdproof construction. Compact all-in-one weather sensor, low power, heater, aspirated radiation shield, open communication protocol.
✅ Measurand : Temperature, relative humidity, precipitation, air pressure, wind direction, wind speed.
✅ Principle Used : Ultrasonic/Wind, NTC/T, Capacitive/RH, MEMS capacitive/Pressure, Tipping spoon and bucket/Precipitation.
✅ Signal Output : RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12.

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, precipitation, air pressure, wind direction and wind speed. One external temperature sensor is connectable.

Advantages of the Smart Weather Sensor WS601:

  • Measuring wind direction and speed insusceptibly to bird nesting thanks to roofed construction
  • All-in-one housing concept of a compact weather sensor combining 7 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
  • Suitable for all climate zones; also for solar-powered automatic meteorological stations
  • Ventilated temperature and humidity detection

Application of the Smart Weather Sensor WS601:

The robust and maintenance-free smart weather sensor WS601 is designed for professional meteorological applications in all climate zones. It delivers reliable data, even in extreme ambient conditions.

  • 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…




General Specification



Ø approx. 164 mm, height approx. 445 mm


Approx. 1.7 kg


RS485, 2 – wire, half – duplex

Power supply

11…32 VDC, 5…11 VDC (electronics with limited precision of measurements), 24 VDC +/- 10% (heater)

Power Consumption

20 VA (heater)

Operating Temperature

-50…60°C (with heater)

Operating Rel. Humidity

0…100% RH

Cable Length

10 m

Protection Level Housing



Compliant to IEC 61724-1:2017

Mast Mounting Suitable For

Mast diameter 60 – 76 mm

Air Temperature

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)

Wind Direction

Principle: Ultrasonic
Measuring range: 0 … 359.9 °
Unit: °
Accuracy: < 3° RMSE > 1.0 m/s
Resolution: 0.1

Wind Speed

Principle: Ultrasonic
Measuring range: 0 … 30 m/s
Unit: m/s
Accuracy: ±0.3 m/s or 3 % RMS
Resolution: 0.1 m/s


Accuracy: ±2 %
Resolution: 0.2 mm
Maximum intensity: 144 mm/h

Precipitation (with reduction ring)

Accuracy: ±2 %
Resolution: 0.5 mm
Maximum intensity: 360 mm/h