| Physical and environmental | |
| Power supply | 6…30 VDC; Reverse voltage protection, overvoltage protection |
| Power consumption at 12 VDC | Standby approx. 1 mA Active measurement approx. 140 mA |
| Outputs | RS-485 ASCII / Modbus RTU SDI-12 Analog output 4…20 mA (14 bit, max. load 250 Ω) Digital output (low: 0V, high: Vsupply, max. 1.5 A) |
| Operating temperature | -40…60 °C (-40…140 °F) |
| Storage temperature | -40…60 °C (-40…140 °F) |
| Relative humidity | 0…100 % |
| Protection rating | IP 67 |
| Lightning protection | Integrated protection against indirect lightning with a discharge capacity of 0,6 kW Ppp |
| Housing material | Powder coated aluminum, vandalism- proof Stainless steel option available |
| Mounting bracket | Ø34…48 mm |
| Size L x W x H | 295 x 160 x 210,5 mm (11.61 x 6.30 x 8,29 in) |
| Weight | 5.4 kg (11.90 lb) |
| Velocity | |
| Detectable measurement range | 0.08…16 m/s (depending on waves) |
| Accuracy | ± 0.01 m/s (certified by METAS) |
| Resolution | 1 mm/s |
| Direction recognition | +/- |
| Measurement duration | 5…240 s |
| Measurement interval | 8 s…5 h |
| Measurement frequency | 24 GHz (K-Band) |
| Radar opening angle | 12° |
| Distance to water surface | 0.50…35 m |
| Vertical inclination | Measured internally |
| Automatic vertical angle compensation | |
| Accuracy | ± 1 ° |
| Resolution | ± 0.1 ° |
| Water level measurement | 15 m | 30 m |
| Measurement range (distance between level sensor and water surface) | 0…15 m 49.2 ft. | 0…30 m 98.4 ft. |
| Measurement frequency | 80 GHz | |
| Resolution | 2 mm | |
| Accuracy | ± 0.025 % FS | |
| Level sensor opening angle | 8° | 8° |
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.
Thanks to the non-contact radar technology the RQ-30+ is not susceptible to contamination, debris or driftwood in the water. Furthermore, the non-contact measurement provides very low maintenance and fail-safe operation especially during high water or flooding.
The RQ-30+ can be simply mounted on bridges, on the roofs of closed canals or channel superstructures. Depending on the properties of the water surface the device can be installed in a height of 0.5 to 35 m. The RQ-30 is available in three versions:
The measurable velocity range is between 0.10 and 15 m/s. Additionally the direction of flow is detected, enabling the operation in tide influenced rivers.
Measuring principle
The non-contact radar technology determines the water surface flow velocity using the Doppler frequency shift method and furthermore the water level is established by a travel time measurement. With known cross section profile the discharge Q of the water is calculated.
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