SQ-Series non-contact discharge measurement

Non-contact discharge measurement of wastewater and industrial effluents

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The radar sensors of the SQ series continuously measure the discharge (flow) volume of sewer systems, ducts, semi-filled pipes and other technical channels in the field of wastewater and industrial effluents.

Due to the contact-free measurement deposits and other solids in the water do not harm the sensor. This is especially advantageous for the measurement of wastewater. The compact design allows an installation in manholes or in sewage systems.

  • Non-contact measuring, free of maintenance
  • Discharge calculation through continuous measurement of flow velocity and water level (increased accuracy as through level measurement only)
  • No structural measures in water bodies required
  • No system risks at high water
  • Simple installation and integration in existing measurement and process control systems
  • Watertight, floodable and resistant housing
  • Application in aggressive environments
  • Integrated hydraulic model for precise discharge calculation
  • Measuring range: water level 3 m/ 6 m/ 8 m; velocity from 0.1 to 15 m/s
  • Optional: non-contact measurement of water temperature
Dimensions 3272 mm x 153 mm x 186 mm
Total weight 1.55 kg
Protection IP 68
Power supply 6...30 VDC
Power consumption at 12V standby approx. 1 mA; active operation approx. 140 mA
Operating temperature -35...+60 °C
Miscellaneous protection against over voltage, reverse power and lightning
Waterlevel measurement  
Measurement range

ultrasonic: 0...3 m (SQ-3); 0...6 m (SQ-6)

radar: 0...8 m (SQ-8R)

Blanking distance 0.3 m (SQ-3); 0.35 m (SQ-6); 0.05 m (SQ-8R)
Accuracy +/- 0,25 % FS (SQ-3, SQ-6); +/- 2 mm (SQ-8R)
Resolution 1 mm
Radar frequency 26 GHz (K-Band)
Radar opening angle 15° (SQ-3); 12° (SQ-6); 10° (SQ-8R)
Velocity measurement  
Measuring principle doppler-radar
Measuring range 0.10...15 m/s (depending on flow conditions)
Accuracy +/- 0.01 m/s; +/- 1 % FS
Resolution 1 mm/s
Direction recognition +/-
Measuring duration 5...240 sec.
Measuring interval 8 sec. ...5h
Measuring frequency 24 GHz (K-Band)
Radar opening anlge 12°
Distance to water surface 0.1...35 m
Minimum swell needed 3 mm
Automatic vertical angle compensation  
Accuracy +/- 1°
Resolution +/- 0.1°
Analogue outputs (SQ-analogue) 2 x 4...20 mA (1x for water level; 1 x selectable for flow rate of flow velocity)
Pulse output pulse per volume (selectable units)
Digital Interfaces

1x SDI-12; 1 x RS 485 or Modbus

Transfer rate: 1.2 to 115.2 kBd

Protocol: various ASCII-protocols

Output: discharge, flow velocity, water level, quality parameter