RQ-30L

RQ-30L – Contactless discharge/flow measurement with the option to use and integrate external water level data

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Innovative radar sensor for contactless discharge measurement of rivers, open channels and canals. The RQ-30L is mainly applied where existing measuring sites (e.g. gauging sites) require a quality upgrade without a large investment.

While the water level can be measured as before, the radar sensor improves the accuracy by additionally determining the surface flow velocity. Therefore the RQ-30L is a very effective extension to all sites where the water level should (or must) be measured by a separate instrument other than the RQ-30.

  • Discharge measurement by means of innovative radar technology and via the integration of external data (water level and cross section profile)
  • Upgrading of existing measuring sites with additional surface velocity measurement
  • Proven RQ radar technology: contactless measurement, maintenance-free system, flood-proof
  • No structural work is necessary in the water
  • Recognition of flow direction and hysteresis effects
  • Measurement in tidal waters
  • Measurement in backwater situations
  • Measures even where weed growth prevails and in waters with high turbidity
  • Measuring range from +/- 0.10 to +/- 15 m/s (depending on flow conditions)
  • Analogue outputs 4 to 20 mA (optional)
General  
Dimensions: 175 x 154 x 246 mm
Total weight: 2,7 kg
Protection: IP 67
Power supply: 6...30 V
Power consumption at 12V: standby approx. 1.5 mA; active operation approx. 140 mA
Operating temperature: -35...+60 °C
Distance to water surface: 0,50...35 m
Miscellaneous: integrated lightning protection
Surface velocity measurement  
Measurement range: 0.10...15 m/s (depending on flow conditions)
Accuracy: +/- 0,01 m/s; +/- 1 % FS
Resolution: 1 mm/s
Measurement duration: 5...240 sec.
Measurement interval: 8 sec. ...5h
Measuring frequency: 24 GHz (K-Band)
Radar opening angle: 12°
Distance to water surface: 0,50...35 m
Necessary minimum swell: 3 mm
Automatic vertical angle compensation  
Accuracy: +/- 1°
Resolution: +/- 0,1°
Interface  
Interface: 1 x SDI-12; 1 x RS 485 or Modbus;
transfer rate: 1.2...19.2 kBd; protocol: various ASCII-protocols
output:

- discharge rate

- flow velocity

- water level

- quality parameters

Input (water level values): 4...20 mA current or 0...2.5 V voltage
Output:

3x analogue outputs, 4...20 mA; for:

- water level

- flow velocity

- discharge rate