Project Description

High-Precision Non-Contact Flow Meter for Open Channels

More Information

  • Contactless flow measurement
  • Surface flow velocity measured with radar sensor
  • Water level measured with ultrasonic sensor
  • Wide velocity measurement range from 0,02m/s to 15m/s
  • Distance measurement range from 0,5, to 10m
  • Long range opera on up to 10m above water level
  • Compact, low-power design
  • Wide input voltage range, suitable for solar applications
  • Supports variety of communica on interfaces (RS-232, RS-485, CAN, Alarm open-drain outputs)
  • Op onal SDI-12 support
  • IP68-rated enclosure (for outdoor applications and harsh environments)
  • K-band 24.125 GHz or 24.200 GHz radar operation
  • Automatic mounting angle compensation (cosine correction)
  • Configurable direction of the flow measurement
  • PC application for radar setup and live flow monitoring
  • Simple integration with existing SCADA or telemetry
  • Easy pole, wall or enclosure moun ng


Radar TypeK-band 24.125GHz/24.200GHz Doppler radar,
27 dBm EIRP
Beam Angle12° Azimuth
24° Elevation
Detection Distance50 m
Speed Range0,02 m/s to 15 m/s
Ultrasonic Frequency20 kHz to 350 kHz
Distance Range0,5 m to 10 m
Distance Resolution1 mm
IP RatingIP68


Power Input9 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 Dimensions150mm x 200mm x 250mm


Serial Interface1 x serial RS-485 half-duplex
1 x serial RS-232 (two wire interface)
Baud Rate1200 bps to 115200 bps
Serial ProtocolsASCII-S, GLX-NMEA,
other available on request
CAN InterfaceUp to 1Mbps CAN2.0
SDI-12 InterfaceAvailable as optional add-on module
Alarm Outputs2 x open collector, max 50V 200mA
ConnectorM12 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.


Arantec Engineering, founded in 2006 is an engineering company specialised in development of complete integrated solutions for Smart Cities and environmental monitoring. Through its strong commitment to R&D in the field of wireless sensor networks, Arantec has developed its SmartyPlanet sensor product range. Arantec products are aimed at end users, systems integrators, engineers and consultants so that they can deploy their sensor networks with the minimum time possible with a very favorable cost-benefit ratio.


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 WL flow velocity and level meter uses radar technology to provide precise contactless measurement of surface flow velocity, and ultrasonic robust sensor for measuring the distance from the sensor to the water level. Contactless radar & ultrasonic technology enables quick and simple sensor installation above the water surface, and requires minimum maintenance.

RSS-2-300 WL flow meter is used to monitor flow velocity and water level in 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. Ultrasonic level sensor operates in frequency range between 20 kHz and 350 kHz.

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 WL 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 WL flow meter over serial port and can be used to configure flow meter 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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