From the Lufft WS product family of professional intelligent measurement transducers with digital interface for environmental applications.

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WS100 UMB Compact Weather Station

Key features

  • Maintenance-free operation through ingenious technology without any moving parts
  • Extremely fast measurement from the first raindrop
  • Differentiation between eleven classifications of drop sizes
  • Detection of precipitation and rainfall (rain, freezing rain, hail, snow and sleet)

Absolutely maintenance-free and extremely fast measurement of precipitation type (rain, snow, sleet, freezing rain, hail) and intensity, thanks to radar measurement technology. The smart radar rain sensor & present weather detector!

The Lufft WS100 is our rain sensor with radar technology and adjustable heating. Using a 24-GHz Doppler radar, it measures the speed of all forms of condensed water. These include rain, freezing rain, hail, snow and sleet.

The low-energy sensor detects precipitation from the first drop. Its possible uses are nearly unlimited. Whether in hydrology and water management, agricultural and environmental science, building automation, meteorology or airport and traffic control: the rain gauge measures rain almost anywhere in the world.

Technical specification


Measurement surface 9cm²
Precipitation Types Rain, snow, sleet, freezing rain, hail, drizzle; no precipitation (SYNOP 4677)
Principle Doppler radar
Accuracy ± 0.16 mm or ± 10% of the measured value for liquid precipitation
Resolution liquid precipitation 0.01 / 0 .1 / 0.2 / 0.5 / 1.0 mm (pulse interface)

Measurement ranges

Droplet Size 0.3...5.0 mm
Drop Size Distribution 11 drop size classes with bandwidth of 0.5 mm
Precipitation intensity 0.01...200 mm/h / 0...7.874 inch/h
Particle velocity 00.9...15.5 m/s
Solid precipitation 5.1...~30 mm

General information

Interface RS-485 semi-duplex two-wire, SDI-12, pulse interface / UMB protocol, Modbus
Heating power 9 VA
Power supply 10...28 VDC
Operating humidity range 0...100%
Operating temperature -40...60°C