RQ-30d Reliable, accurate and non-contact discharge measurement especially for wide rivers and streams with inhomogeneous distribution of flow velocity. 99 Discharge measurement at high accuracy for very broad bodies of water and at inhomogeneous velocity distribution 99 Only one level measurement, but multiple individual velocity measurements 99 Proven Sommer RQ radar technology: non-contact measuring, maintenance free and flood-proof 99 No structural work is necessary in the water 99 Recognition of flow direction and hysteresis effects 99 Measurement in tidal waters 99 Measurement in backwater situations 99 Measures even where weed growth prevails and in waters with high turbidity 99 Measuring range from +/-0.10 to +/-15 m/s (depending on the flow conditions) 99 Optional: analogue outputs from 4 to 20 mA

General Sommer radar technology The radar sensors of the RQ-series measure continously and contact-free the discharge of rivers, streams, open channels or canals. For that two principles of radar measurement are combinded within the device, one to determine the surface flow velocity and one for the water level. Together with a known cross section profile the sensor can then calculate accurately the discharge Q of the water. Non-contact = failsafe = low maintenance Thanks to the non-contact measurement technology it is possible to install the sensor outside the body of water. Hence, the equipment...

Measuring principle Surface flow velocity The measurement of the surface flow velocity is based on the Doppler frequency shift method: A radar signal is transmitted to the water surface at a constant frequency of 24 GHz. The sensor measures the partially reflected signal whose frequency is shifted due to the water movement. The surface velocity is determined through a spectral analysis. With a hydraulic model the sensor converts the surface velocity into the relevant mean velocity which is needed for the discharge calculations. Local velocity (vl) measuring point Mean velocity (vm) Cross section...

Technical details General Dimensions (mm) Total weight Material master: 338 x 333 x 154 | slave: 175 x 154 x 246 2 brackets per device for pipe diameter of of Ø 34 – 48 mm master: 5.4 kg | slave: 2.7 kg aluminium housing, powder coated Power supply Power consumption per device (at 12 V) 6 ... 30 V standby approx. 1 mA active operation approx. 140 mA Operating temperature Storage temperature Lightning protection integrated lightning protection Water level measurement (only slave device) Water level 0 ... 15 m - standard version 0 ... 35 m - extended measurement range (optional) Radar frequency...