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WS800-UMB Smart Weather Sensor

Make:   Lufft                                             Model:   WS-800 UMB
✅ Wind detection with birdproof construction. First and only compact all-in-one weather sensor with lightning detection, low power, heater, aspirated radiation  shield, maintenance-free operation, open communication protocol.
✅ Measurand: temperature, Relative humidity, Air pressure, Wind direction, Wind speed, Precipitation intensity, Precipitation quantity, Radiation, Lightning strikes
✅ Principle Used: Ultrasonic/Wind, NTC/T, Capacitive/RH/Pressure, Radar/Precipitation, radio wave emission/Lightning strikes
✅ Signal Output: RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12
✅ Article number: 8381.U01, 8381.U01-NA

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, solar radiation, lightning detection, air pressure, wind direction and wind speed. One external temperature sensor is connectable.

Advantages of the Smart Weather Sensor WS800:

  • Measuring wind direction and speed insusceptibly to bird nesting thanks to roofed construction
  • First and only all-in-one compact weather sensor with lightning detection
  • 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
  • Integrated heater that can be switched on if there is danger of frost

Applications of the Smart Weather Sensor WS800:

  • 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




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)

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

Lightning Detection

Lightning detection: Number of lightning events, Coverage area: 5 – 10 km

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

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

Precipitation (liquid)

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
Reproducibility: Typical >90 % under laborary conditions


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