KNX R sl

Precipitation sensor

The Precipitation Sensor KNX R sl for the KNX building bus system detects precipitation. One switching output, AND logic gates and OR logic gates are available.

The compact housing of the KNX R sl accommodates the sensors, evaluation circuits and bus-coupling electronics.


  • KNX R sl KNX R sl
  • KNX R sl lateral view KNX R sl lateral view
  • KNX R sl from above KNX R sl from above
  • Precipitation detection: The sensor surface is heated, so that only drops and flakes are recognised as precipitation, but not mist or dew. When the rain or snow stops, the sensor is soon dry again and the precipitation warning ends 
  • 2 switching outputs (communication objects) 
  • 4 AND and 4 OR logic gates, each with 4 inputs. All switching events as well as 16 logic inputs (in the form of communications objects) can be used as inputs for the logic gates. The output of each gate can be configured optionally as 1-bit or 2 x 8-bit 
  • Configuration is made using the KNX software ETS (as of version 5)
HousingPlastic
ColourWhite / Translucent
AssemblySurface mount
Protection categoryIP 44
Dimensionsapprox. 62 × 71 × 145 (W × H × D, mm)
Weightapprox. 80 g
Ambient temperatureOperation -25…+85°C, storage -30…+85°C
Auxiliary supply12…40 V DC, 12…28 V AC. An appropriate power supply unit can be purchased from Elsner Elektronik.
Auxiliary currentat 12V DC: max. 185 mA
at 24V DC: max. 90 mA
at 24V AC: max. 82 mA
Bus currentmax. 10 mA
Data outputKNX +/-
Communication objects54
made in germany