WS100 Radar Precipitation Sensor – FAQs

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WS100 FAQs

Frequently Asked Questions – WS100 Radar Precipitation Sensor

Do you have questions about the new WS100 Radar Precipitation Sensor? Click here or scroll below to read a helpful list of WS100’s Most Frequently Asked Questions.

About WS100 

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. It’s 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.

  • Absolutely maintenance-free and low-energy 24-hour operation
  • Every second counts: Precise precipitation measurement from the first drop
  • Precision sensor with radar technology designed for all industrial needs
  • Designed for all common data loggers and data acquisition systems



1. Is it possible to setup the WS100 radar precipitation sensor / disdrometer via SDI-12?

Yes, it is possible to setup the sensor using SDI-12 commands using the UMB Configuration tool. Also, it is possible to order the sensor preconfigured.

The following parameters can be changed via SDI-12:

SDI-12 address Units (metric / US) Averaging interval (only service channel temperature)
Heating mode
Reset (without resetting the rainfall)
Reset with reset of rainfall

These parameters can be changed via the UMBConfigTool.NET:


As the name implies, the UMB ConfigTool only works with the UMB protocol.

Due to preconfiguration of devices, the production can be addressed directly. Basically, with this configuration is how our partner from the Netherlands gets the VENTUS for example.


2. How does the WS100 radar precipitation sensor / disdrometer compare to the OTT Parsivel² Present Weather Sensor?

The WS100 sensor has an accuracy (liquid) of 10%*, whereas the Parsivel has an accuracy of ± 5 % (liquid) /± 20 % (solid).

*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.


3. How does the WS100 radar precipitation sensor / disdrometer compare to tipping bucket rain gauges?

Based on a laboratory test conducted at the Lufft facility using a 13-meter rain simulator (RASY), and using the WS401 tipping bucket rain gauge as a reference (0% deviation) the deviation of the three WS100 is smaller than 10%, not taking into account the slight variation of RASY. For more information on the comparison test, please click here.


4. Does the sensor compensate for back scatter or wind influence?

While there is no compensation for the backscatter or wind influence, the small straight measurement field the WS100 performance shows reduced wind influence compared to its predecessor the Lufft R2S


5. What settings does ecoMode change?

EcoMode turns off the sensors heater. Eco Mode 1 also shuts off the radar. Every 60s it’s activated again for about 5s. In case precipitation is detected, it stays on. If not, it switched off again.

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