RSS-2-300 W Surface Velocity Radar

Product Highlights
  • Contactless flow measurement
  • Operates in the K-band (24.075 - 24.175 GHz)
  • Wide measurement range from 0,02 m/s to 15 m/s
  • Long range operation up to 20 m above the water
  • Low power consumption (950 mW operational, 85 mW standby)
  • 9 to 27 VDC input voltage range
  • IP68 aluminum casing
  • RS-485/Modbus-RTU, RS-232 and 4-20 mA output interfaces
  • Optional SDI-12 interface support
  • Automatic mounting tilt angle compensation
  • Easy pole, wall or enclosure mounting
  • Operating temperature range from -40 °C to +85 °C (-40 °F to +185 °F)
Product Description
Geolux RSS-2-300 W flow 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 deal for measurement of flammable fluids and harsh chemical applications.
The radar operates in K-band (24.075-24.175 GHz), and provides flow speed readings 10 times per second over serial (RS-232, RS- 485) and analog 4-20 mA output. Variety of supported communication interfaces and protocols enable easy integration with existing telemetry wquipment 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.

Open Channel Flow Measurement

An RSS-2-300 W surface velocity radar provides precise, contactless measurement of surface flow velocity in open channels. Unlike ultrasound-based flow velocity sensors, the radar sensor is immune to air temperature and air density changes. The radar is enclosed inside a robust, IP68-rated, waterproof enclosure, making it immune to harsh environmental conditions. The sensor is mounted above the water surface.

Industrial Flow Measurement

RSS-2-300 W radar can be used for precise flow measurement in all kinds of outdoor and indoor industrial facilities. Since the radar waves propagate through plastic materials, the radar can be used to measure flow speed inside plastic pipes and tubes within an industrial facility. Geolux RSS-2-300 W radar is also perfectly suited for use in various water and sewage processing facilities, hydro power plants, etc.
Product Videos
Detailed Specifications


Radar Type
K-band 24.075 - 24.175 GHz Doppler radar, 20 dBm EIRP
Beam Angle
12° Azimuth
24° Elevation
Detection Distance
20 m - height above the water
Speed Range
0,02 m/s to 15 m/s
0,0001 m/s
IP Rating

Electrical & Mechanical

Power Input
9 to 27 VDC
Power Consumption
950 mW operational
85 mW standby
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
9600 bps to 115200 bps
Serial Protocols
other available on request
Analog Output
1 x 4-20 mA
SDI-12 Interface
Available with optional add-on module
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