Non-contact discharge radar RQ-30 (RQ-30a)
The RQ-30 is a sensor for continuous discharge measurement of rivers, open channels and canals with known cross-section profile. The sensor uses innovative radar technology to measure velocity, water level and discharge. It enables reliable, non-contact measurement without the need for structural work in the water.
- Non-contact, maintenance free measurement system
- No structural work is necessary in the water
- No threat to the systsem through flooding
- Low power consumption enables operation using solar cells
- Recognition of flow direction
- Measuring range from +/- 0.10 to +/- 15 m/s (depending on the flow conditions)
- Recognition of hysteresis-effects
- Measurement in backwater situations
- Measures even where weed growth prevails and sensor is not affected by turbidity
- Measurement in tidal waters
- Automatic angle measurement
- Optional (RQ-30a): analogue outputs from 4 to 20 mA
The RQ-30 enables discharge measuerment for rivers, streams, open channels and canals for which continuous monitoring is desired. Thanks to the non-contact radar technology the measuring equipment is not susceptible to contamination, debris or driftwood in the water. Furthermore, the non-contact measurement warrants very low maintenance and fail-safe operation especially during high water or flooding. The sensor can be simply mounted on bridges, on the roofs of closed canals or channel superstructures.
The non-contact radar technology determines the water surface flow velocity using the Doppler frequency shift method, the water level is established by a travel time measurement. With known cross section profile the discharge Q of the water can then be calculated on basis of the continuity equation: Q = vm · A (h)
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Non-contact discharge radar RQ-30 (RQ-30a)
Technical data
| Dimensions | 338 mm x 333 mm x 154 mmm |
| Total weight | 5,4 kg |
| Protection | IP 67 |
| Power supply | from 6 to 30 V |
| Power consumption at 12 V | standby: approx. 1mA; active: approx. 140 mA |
| Operating temperature | -35 to +60 °C |
| Miscellaneous | integrated lightening protection |
| Measurement range | from 0 to15 m (standard); 0 to 35 m (extended) |
| Resolution | 1 mm |
| Radar frequency | 26 GHz (K-Band) |
| Radar opening angle | 10 ° |
| Measurement range | from 0,1 to15 m/s |
| Accuracy | +/- 0,01 m/s; +/- 1 % FS |
| Resolution | 1 mm/s |
| Measurement duration | from 5 to 240 s |
| Measurement interval | from 8 s to 5 h |
| Measurement frequency | 24 GHz (K-Band) |
| Radar opening angle | 12 ° |
| Distance to water surface | from 0,5 to 35 m |
| Necessary minimum wave height | 3 mm |
| Analogue output (RQ-30a) | 3 x output 4 - 20 mA for water level, velocity and discharge |
| Digital interface |
1 x SDI-12; 1 x RS 485 or Modbus Transfer rate: 1,2 to 19,2 kBd |
