RQ-30L Innovative radar sensor for non-contact discharge measurement of rivers, open channels and canals with the possibility to use external level data. 99 Discharge measurment by use of innovative radar technology and through integration of external data (water level and cross section profil) 99 Upgrading of existing measuring sites with additional surface velocity measurement 99 Perfectly suitable on existing cableways 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 EN

General Sommer radar technology The radar sensors of the RQ-series measure contactfree the discharge of rivers, streams, open channels or canals. The RQ-30L in particular continuously determines the surface flow velocity. Together with the values of the actual water level and information about the cross section profile the sensor is able to calculate the discharge. Non-contact = failsafe + low maintenance Thanks to the non-contact measurement technology it is possible to install the sensor outside the water. Hence, the equipment is not susceptible to contamination, debris or driftwood in the...

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 any further discharge calculations. Local velocity (vl) measuring point Mean velocity (vm) Cross...

Technical Details General Dimensions (mm) 241 x 246 x 154 2 brackets for pipe diameter of Ø 34 – 48 mm Total weight Material 2.7 kg aluminium housing, powder coated Power supply Power consumption (at 12 V) 6 ... 30 V standby approx. 1.5 mA active operation approx. 110 mA Operating temperature Storage temperature Lightning protection integrated lightning protection Surface velocity measurement Measurable range Accuracy 0.10 ... 15 m/s (depending on the flow conditions) +/- 0.01 m/s; +/- 1 % FS Measurement time Measurement interval Measurement frequency Radar opening angle Distance to water surface...