Precipitation Sensors



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.

  • Rain/precipitation quantity, rain/precipitation type (Rain, snow, sleet, freezing rain, hail)
  • 24GHz Doppler radar
  • Very fast response time, maintenance-free measurement, present weather detection
  • RS-485 semi-duplex two-wire, SDI-12, pulse interface / UMB protocol, Modbus

Absolutely maintenance-free and low-energy 24-hour operation

  • Maintenance-free operation through ingenious technology without any moving parts
  • Energy-saving sensor thanks to the improved ECO mode (0.4 VA)
  • Extended heating capacity allows operation in summer as well as in winter
  • Improved heating power with lower power consumption: Sensor heating integrated directly on the dome wall, power consumption with 9 VA heating.
  • Very long service life and high operational reliability due to high quality components
Dimensions Ø150 mm (5.9 in), height: 190 mm (7.48 in)
Weight ~0.6 kg
Electrical parameters
Power supply 10…28 VDC
Power consumption without heating 1 VA / 0.4 VA (low power mode)
Heating power 9 VA
Operating parameters
Operat. temp. range -40…60°C
Operat. humidity range 0…100 %
Protection class IP66
Survival wind speed 75 m/s
Data transfer
Interfaces/ protocols RS-485 semi-duplex two-wire, SDI-12, pulse interface / UMB protocol, Modbus
(Pluggable) cable length 10 m
Transmission frequency 24 GHz
Measurement surface 9 cm²
Precipitation types Rain, snow, sleet, freezing rain, hail; No precipitation (SYNOP 4677)
Principle Doppler radar
Accuracy ±10 %*
*) Under laboratory conditions by means of Lufft test system: Reference drop simulator with 2.8 mm drop diameter and adjustable intensity between 10 and 200 mm/h.
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
DSD 11 drop size classes with bandwidth of 0.5 mm
Precipitation intensity 0.01…200 mm/h / 0…7.874 inch/h
Particle velocity 0.9…15.5 m/s
Solid precipitation 5.1…~30 mm

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