RSS-2-300W Surface Velocity Radar

The Geolux RSS-2-300W radar sensor uses radar technology for providing contactless measurement of surface flow velocity. Contactless radar technology enables quick and simple sensor installation above the water surface with minimum maintenance. 

Product Highlights

  • Contactless surface velocity measurement
  • Accuracy tested at Swiss Federal Institute of Metrology METAS and Brodarski Institut Labs
  • RS-232, RS-485 Modbus, analog 4-20 mA interfaces in all models
  • Remote configuration of all instrument parameters through any digital communication interface
  • Robust small size IP68 aluminum or stainless steel enclosure


  • Early flood warning
  • Monitoring of flow and irrigation channels
  • Accurate discharge monitoring in rivers
  • Flow tracking in salt and copper mine channels
  • Sewage and waste water discharge measurement

General Specifications 

Radar Type K-band 24.075 GHz to 24.175 GHz Doppler radar, 20 dBm EIRP
Beam Angle

12° Azimuth

24° Elevation

Detection Distance 20 m above the water
Speed Range 0.02 m/s to 15 m/s
Resolution 0.001 m/s
Accuracy 1%
Sampling Frequency 10 sps
IP Rating IP68


Electrical & Mechanical 

Input Voltage 9 - 27 VDC
Power Consumption 950 mW operational, 85 mW standby
Maximum Current < 250 mA
Temperature Range -40 °C to +85 °C (without heating or coolers)
Device Outer Dimensions 110mm x 90mm x 50mm



Serial Interface

1 x serial RS-485 half-duplex

1 x serial RS-232 (two wire interface)

Serial Baud Rate 9600 bps to 115200 bps
Serial Protocols GLX-NMEA, Modbus
Analog Output 1 x 4-20 mA
SDI-12 Interface Available with optional add-on module
Connector M12 circular 12-pin