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WS800-UMB Smart Weather Sensor

First and only compact all-in-one weather sensor with detection of lightning strikes

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.

  • temperature, relative humidity, air pressure, wind direction, wind speed, precipitation intensity, precipitation quantity, radiation, lightning strikes
  • Ultrasonic/Wind, NTC/T, Capacitive/RH/Pressure, Radar/Precipitation, radio wave emission/Lightning strikes
  • 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.
  • RS485 with supported protocols UMB-Binary, UMB-ASCII, Modbus-RTU, Modbus-ASCII, XDR and SDI-12
  • 8381.2, 8381.1
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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

Examples of use of the Smart Weather Sensor WS800

The robust and maintenance-free smart weather sensor WS800 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

More about lightning detection of the WS800 Weather Sensor

WS800-UMB includes lightning detection by an integrated sensor analysing the radio wave emission of lightnings. It delivers a count of recognized lightnings.

The sensor analyses spectrum and wave form of the received signal to suppress the detection of man made electrical discharges.

Product variants - Smart Weather Sensor WS800

The Smart Weather Sensor WS800 is available in two product variants because of special laws concerning the use of radar technology in the USA, which is part of the precipitation measurement of the WS800.

  • Smart Weather Sensor WS800-UMB -Country version: Europe (Article no. 8381.2)
    Frequency range 24.150 GHz – 24.250 GHz
  • Smart Weather Sensor WS800-UMB - Country version: USA  (Article no. 8381.1 )
    Frequency range 24.075 GHz – 24.175 GHz


EU declaration of conformity - Lufft WS Radar
Firmware - WSXXX
For WSXXX device versions 1 - 29 (see serial number) / Für WSXXX Geräteversionen 1 - 29 (siehe Seriennummer)
Firmware - WSXXX v70
For WSXXX device versions ≥30 (see serial number)
Full User Manual - Lufft WSxxx weather sensors
Leaflet - Product Family of smart Weather Sensors - Lufft WSxxx Series
Manual - Lufft UMB Config Tool (EN)
Manual - Lufft UMB Protocol (EN)
Operational Manual - Lufft WSxxx weather sensors
Quickstart - Lufft WSXXX - Smart Weather Sensor Family (DE/EN)
Software - Lufft - ConfigTool .NET
Version 1.6
Software - UMB Config Tool
Video - WS product family - Integration of external sensors
Download as PDF
Dimensions Ø approx. 150 mm, height approx. 317 mm
Weight Approx. 1.5 kg
Interface RS485, 2 - wire, half - duplex
Power supply 11...32 VDC
Power supply 5...11 VDC (electronics with limited precision of measurements)
Power supply 24 VDC +/- 10% (heater)
Frequency range 24.150 GHz – 24.250 GHz (Europe; Article no. 8381.2)
24.075 GHz – 24.175 GHz (North America; Article no. 8381.1 )
Operating temperature -50...60°C (with heater)
Operating rel. humidity 0...100% RH
Cable length 10 m
Protection level housing IP66
Standards/Regulations 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
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
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
Download as PDF

WS product family: Communication after protocol change

How to communicate with a WS-Sensor and the UMB-config-Tool if the protocol was changed for example to Modbus or SDI-12?

After a Reset ( switching On/Off the sensor) every WS-Senor will start up for the first 5 seconds in UMB-protocol and the standard baud rate of 19200Bd. Independend to the configured protocol and baudrate settings of the WS-Sensor.

In this first 5 Seconds you will be able to connect via UMB-config-Tool to the WS-Sensor after this first command was send the UMB-protocol will stay for 10 minutes after that it switches back to the original configured protocol. This Time will always be extended to 10 minutes if a new UMB command was send.

WS800: What is the max. radius a lighting can be detected from the WS800?

The WS800 uses a integrated electronic chip to detect the lighting. The max. radius of this detection is approximately 10 Km.

WS product family: SDI-12 wiring plan for Device version >= 42

How to connect a WS-sensor with a device version >= 42 (hardware version >=14) to a SDI-12 system?

The wiring plan has changed compared to the wiring plan of older WS-Sensor device versions.
The new wiring plan is:

  • +VDD = brown
  • GND = white
  • SDI12_Signal = yellow
  • SDI12_GND = white

This is also mentioned as a note in the latest WS-sensor manual in the section 8 Connections