Geolux Non-Contact Surface Velocity Sensor

The Geolux non-contact surface velocity sensor uses radar technology for providing contactless measurement of velocity for water level, flood, and discharge monitoring applications.


  • Contactless surface velocity measurement
  • RS-232, RS-485 Modbus, analog 4-20 mA interfaces in all models
  • Robust, small-size IP68 enclosure
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The Geolux non-contact surface velocity sensor uses radar technology for providing contactless measurement of velocity for water level, flood, and discharge monitoring applications.

Contactless radar technology enables quick and simple sensor installation above the water surface with minimum maintenance. The radar operates in K-band (24.075 GHz to 24.175 GHz) and provides velocity readings 10 times per second over serial RS-232, RS-485 Modbus, and analog 4-20 mA output. The instrument is easily integrated with third-party dataloggers and all of the settings can be remotely configured. An integrated MEMS sensor is used for automatic angle compensation. Internal vibration monitoring and SNR calculation can be used for measurement quality assessment.

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: Up to 20m above the water
Speed Range: 0.02m/s to 15m/s
Resolution: 0.001m/s
Accuracy: 1%
Sampling Frequency: 10 samples per second
IP Rating: IP68

Electrical & Mechanical
Input Voltage: 9 to 27 VDC
Power Consumption: 950 mW operational, 85 mW standby
Max 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

EN 60950-1:2006+A1:2010+A11:2009+A12:2011+A2:2013
EN 62311:2008
EN 301 489-3 V2.1.1:2019
EN 301 489-1 V2.2.3:2019
EN 61000-6-2:2019
EN 61000-6-3:2021
EN 6100-6-2:2017
EN 300 440 V2.2.1:2018
EN 62368-1:2014+A11:2017
EN 62311:2008
EN 60529:2000+A1:2008+A2:2014 IP68
FCC Part 15 class B

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