Project Description

High-Precision Non-Contact Open Channel Surface Flow Velocity Meter

More Information

  • Contactless flow measurement
  • Operates in K-band (24.125 GHz or 24.200 GHz)
  • Wide measurement range from 0,02 m/s to 15 m/s
  • Long range operation up to 50 m
  • Low power consumption (max 1,35 W, typically 1 W)
  • 9 to 27 VDC input voltage range
  • Operating temperature range from -40 °C to +85 °C (-40 °F to +185 °F)
  • IP68 aluminum casing
  • RS-232, RS-485 and CAN communication interface support
  • ASCII-S and GLX-NMEA protocols support; more protocols can be supported on customer request
  • Optional SDI-12 interface support
  • Automatic mounting tilt angle compensation
  • Easy pole, wall or enclosure mounting


Radar Type K-band 24.125GHz/24.200GHz Doppler radar,
27 dBm EIRP
Beam Angle 12° Azimuth
24° Elevation
Detection Distance 50 m
Speed Range 0,02 m/s to 15 m/s
IP Rating IP68


Power Input 9 to 27 VDC
Power Consumption < 1,35W (typical 1,0W)
Maximal 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)
Baud Rate 1200 bps to 115200 bps
Serial Protocols ASCII-S, GLX-NMEA,
other available on request
CAN Interface Up to 1Mbps CAN2.0
SDI-12 Interface Available as optional add-on module
Alarm Outputs 2 x open collector, max 50V 200mA
Connector M12 circular 12-pin


EN 50293:2000
EN 61000-6-2, EN 61000-6-4:2007
EN 61000-3-2:2006+A1:2009+A2:2009, EN 61000-3-3:2008
EN 300 440-1, EN 300 440-2
FCC Part 15 Subpart C


HydroSpan Ltd.
HydroSpan Ltd.
HydroSpan Limited (subsidary of Eagle Technologies(Shenzhen) Ltd, China), founded in 2009 in Xian High-Tech Zone, specialized in developing and selling sensors and hydrological monitoring equipment including system solutions for hydrology, irrigation, flood alert, sewage, industry and water treatment applications. HydroSpan is a major instrumentation supplier of sensors and water monitoring systems to China’s National Hydrological Info Service, Irrigation & Drainage Metering Service, Small and Medium-sized Rivers Monitoring Program, National Academy of Water Science, Chinese Army Corps of Hydro Engineering, River&Ocean University of China as well as many provincial and local governments and private sector industries.


METRICA SA founded in 2005 whose main activity is the representation of measuring high-precision systems in Greece. The company relies on the expertise of experienced staff, which has presence in the field of metering applications over 15 years and consists of Surveying Engineering / Kush, Mechanical Engineering, Electrical Engineering / Kush, Chemical Engineering / Kush, Foresters and Geologists. It has deep expertise in order to provide advisory services for the selection of appropriate equipment.


Clients from Europe, North & South America, Africa and Australia should send their inquiries directly to Geolux. We are looking for distributors to expand our distributor network in these regions.

Product Description

Geolux RSS-2-300 W surface flow velocity meter uses radar technology to provide precise contactless measurement of surface flow velocity. Contactless radar technology enables quick and simple sensor installation above the water surface, and requires minimum maintenance.

RSS-2-300 W flow meter is used to monitor flow velocity of open channels such as rivers, irrigation channels or sewer systems, and for monitoring and control of hydropower plants and wastewater treatment plants. The flow meter is also suitable for various mass flow metering applications in mining processing plants, industrial installations, and, due to operation without moving parts and robust mechanical design, is ideal for measurement of flammable fluids and harsh chemical applications.

The radar operates in K-band (at 24.125 or 24.200 GHz), and provides flow speed readings 20 times per second over serial (RS-232, RS-485) and CAN interfaces. Variety of supported communication interfaces and protocols enable easy integration with existing telemetry equipment and SCADA systems. Integrated tilt sensor measures inclination angle of the sensor and the flow velocity measurement is automatically cosine-corrected according to the measured mounting tilt angle.

Geolux RSS-2-300 W radar sensor is certified according to both European and American standards, and is being used worldwide.

Radar Configurator Software

Geolux provides a user-friendly RSS-2-300 Water Flow Radar Configurator PC software free of charge. The software connects to the RSS-2-300 W radar over serial port and can be used to configure radar operating parameters. Additionally, the Configurator utility also displays the measured flow speed over time.

The Configurator utility allows users to change the output data protocol, to select serial baud rate, change and configure various measurement and averaging algorithms, and to control the radar orientation.

RSS-2-300 Water Flow Radar Configurator runs on Windows XP or later, both 32-bit and 64-bit.

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