RQ-30/ RQ-30a

RQ-30 - Non-contact discharge / flow measurement by radar sensors

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Non-contact discharge / flow measurement for surface running waters, like rivers, streams, channels, canals or open canels. Radar sensors detect gapless all flood data at high water. The system is also suitable to use as evidence of outward flow in power plant operation.

  • Free of maintenance
  • No structural measures in water bodies required
  • No system risks at high water
  • Low energy consumption, solar operation possible
  • Detection of flow direction
  • Measuring range from 0,30 to 15 m / s
  • Recognition of hysteresis effects
  • Measurement at points with backflooding possible
  • Detects weeds
  • Measurement in ebb tide / flood affected waters
  • Analogue outputs
Dimensions: 338 mm x 333 mm x 154 mm
Total weight: 5.4 kg
Protection: IP 67
Power supply: 6...30 V
Power consumption at 12V: standby approx. 1mA; active operation approx. 140mA
Operating temperature: -35...+60 °C
Miscellaneous: protection against over voltage, reverse power and lightning
Waterlevel measurement  
Measurement range: 0...15 m standard version / 0...35 m extended version
Accuracy: +/- 0,01 m/s; +/- 1 % FS
Resolution: 1 mm/s
Radar frequency: 26 GHz (K-Band)
Radar opening angle: 10°
Velocity measurement  
Measuring range: 0.10...15 m/s (depending on flow conditions)
Accuracy: +/- 0.01 m/s; +/- 1 % FS
Resolution: 1 mm/s
Direction recognition: +/-
Measuring duration: 5...240 sec.
Measuring interval: 8 sec. ...5h
Measuring frequency: 24 GHz (K-Band)
Radar opening anlge: 12°
Distance to water surface: 0.50...35 m
Minimum swell needed: 3 mm
Automatic vertical angle compensation  
Accuracy +/- 1°
Resolution +/- 0.1°

analogue: 4x outputs 4 - 20 mA (RQ-30a)

digital:1x SDI-12 1 x RS 485 or Modbus

Transfer rate: 1.2...19.2 kBd
Protocol diverse ASCII-protocols

discharge rate

flow velocity


quality parameters