RQ-30a Non-Contact Discharge Radar Sensor

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The RQ-30a and the RQ-30a-30m are sensors for continuous discharge measurement of rivers, open channels and canals with known cross-section profile. The sensors use innovative radar technology to measure velocity, water level and discharge. They enable reliable,… Read more

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Specifications

Protection Class	IP 67
Power	Supply: 6 to 30 VDC Consumption at 12 VDC: standby approx. 1 mA, active measurement approx. 140 mA Over voltage protection, reverse voltage protection, lightning protection (integrated protection against indirect lightning with a discharge capacity of 0,6 kW Ppp)
Temperature and Humidity	Operating and storage temperature: -40 to 60 °C (-40 to 140 °F) Relative humidity: 0.. to 100 %
Interface	Outputs RS-485 ASCII / Modbus RTU, SDI-12 Analog output: 4 to 20 mA (14 bit, max. load 250 Ω) Digital output (low: 0V, high: Vsupply, max. 1.5 A)
Material	Housing material powder-coated aluminum, vandalism-proof (stainless steel option available)
Dimensions and Weight	L x H x W: 338 mm x 333 mm x 154 mm (13.31 x 6.06 x 13.11 in), 5.4 kg (11.90 lb) Mounting Bracket (included): Ø 34 to 48 mm
Water Level Measurement	Measurement range (distance between level sensor and water surface): Standard RQ-30a: 0 to 15 m (0 to 49.21 ft) Extended version RQ-30a-35m: 0 to 35 m (0 to 114.83 ft) Measurement frequency: 80 GHz (standard LVQ-15), 26 GHz (extended version LVQ-35) Resolution 2 mm Accuracy: ± 0.025 % FS Level sensor opening angle: 8° (standard LVQ-15), 10° (extended version LVQ-35)
Velocity Measurement	Detectable measurement range: 0.08 to 18 m/s (depending on waves) Accuracy: +/- 0.01 m/s; +/- 1 % FS Resolution: 1 mm/s Direction recognition: +/- Measurement duration: 5 to 240 s, measurement interval: 8 s to 5 h Radar: frequency 24 GHz (K-Band), opening angle 12° Distance to water surface: Standard RQ-30a: 0.50 to 35 m (0.16 to 49.21 ft) Extended version RQ-30a-35m: 0.05 to 130 m (0.16...426.51 ft) Vertical inclination measured internally Necessary minimum wave height: 3 mm
Automatic vertical angle compensation	Accuracy +/- 1°, resolution +/- 0.1°

Videos

Description

Thanks to the non-contact radar technology the RQ-30a is not susceptible to contamination, debris or driftwood in the water. Furthermore, the non-contact measurement ensures very low maintenance and fail-safe operation especially during high water or flooding.

The RQ-30a 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-30a is available in two versions:

RQ-30a: water levels from 0 to 15 meters
RQ-30a-30m: water levels from 0 to 35 meters

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.

Benefits

Non-contact, maintenance-free measurement system; no structural work needed
Fully operating even in flood water situations
Low power consumption enables operation using solar cells
Detection of flow direction
Recognition of hysteresis effects
Measures in backwater situations
Automatic installation angle correction
Automatic discharge calculation based on hydraulic model with multiple k-factors
Sensor self check with status and error output
3-point velocity calibration certificate
Water level and velocity sensor combined in one weather and vandalism proof housing

Downloads

RQ-30a Information Brochure

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RQ-30a Brochure

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RQ-30a Manual

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Atlas HCFCD Case Study

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RQ-30a Non-Contact Discharge Radar Sensor

Measuring principle

RQ-30a Information Brochure

RQ-30a Brochure

RQ-30a Manual

Atlas HCFCD Case Study