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WS700-UMB Smart Weather Sensor

Make:  Lufft                                                      Model:  WS-700 UMB
✅ Wind detection with birdproof construction. Compact all-in-one weather sensor, low power, heater, aspirated radiation shield, maintenance-free operation, open communication protocol.
✅ Measurand : Temperature, relative humidity, precipitation intensity, precipitation type, precipitation quantity, air pressure, wind direction, wind speed, radiation.
✅ Principle Used : Ultrasonic/Wind, NTC/T, Capacitive/RH, MEMS capacitive/Pressure, Radar/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 intensity, precipitation type, precipitation quantity, air pressure, wind direction, wind speed and radiation. One external temperature sensor is connectable.

Advantages of the Smart Weather Sensor WS700:

  • 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
  • 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 detection
  • Integrated heater that can be switched on if there is danger of frost

Application of the Smart Weather Sensor WS700:

  • 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. 150 mm, height approx. 317 mm


Approx. 1.5 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

40 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 Class C

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 … 75 m/s
Unit: m/s
Accuracy: ±0.3 m/s or ±3 % (0…35 m/s) ±5 % (>35 m/s) RMS
Resolution: 0.1


Droplet size: 0,3 … 5 mm
Detection sensitivity: 0,01 mm/h
Particle velocity: 0.9 … 15.5 m/s
Precipitation types: rain/ snow
Solid precipitation: 5.1 … ~30 mm
Intensity range: 0…200mm/h
Intensity resolution: 0.01 mm/h
Amount resolution: 0.1 mm
Accuracy: 20 % under laborary conditions
Typical >90 % under laborary conditions


Unit: W/m²
Accuracy: 5%
Response time (95%): < 1 s
Spectral range: 300 to 1100 nm
Measuring range: 1400 W/m²