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High-Precision Non-Contact Flow Meter for Open Channels

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Open Channel Flow Measurement

RFL 24VDC combines high-precision radar and ultrasound technologies to provide contactless measurement of both the surface flow velocity and the fluid level. These two measurements, combined with the knowledge of open channel cross-section geometry, allow precise measurement of open channel fluid discharge. Integrated tilt sensor and automatic tilt compensation allow simple mounting and ad-hoc use without requiring special calibration.

Industrial Flow Measurement

RFL 24VDC flow meter is perfectly suited for use in industrial water/sewage processing plants and near hydro-power plants. The flow meters works perfectly well with clean water and also with sewage/waste water.

Detailed Specifications:


  • 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
  • Ultrasonic Frequency: 20 kHz to 350 kHz
  • Distance Range: 0,5 m to 10 m
  • Distance Resolution: 1 mm
  • IP Rating: IP68

Electrical & Mechanical:

  • 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: 150mm x 200mm x 250mm


  • 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

Product Highlights

  • 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

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