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Hawk Measurement ORCA Bed Level System

Principle of Operation:

The Hawk Measurement ORCA Bed Level System transducer emits a high powered acoustic pulse, which is reflected from the interface density selected. The reflected signal is processed using specially developed software algorithms, that eliminate lighter floating densities and stratified layers, allowing measurement of RAS or BED levels. It can be calibrated to measure lighter densities like FLOC or one of the outputs could be used for a CLARITY output, similar to a basic turbidity transmitter measuring solids in suspension. By choosing the correct sonar transducer frequency, the ORCA sonar guarantees the optimized performance when measuring both light and heavy density interfaces.

Primary Areas of Application:

  • Sewage & Wastewater Primary Sedimentation – Blanket level measurement
  • Secondary and final Clarifiers – RAS Blanket and fluff/pin floc layer measurement
  • Thickeners and DAF – Bed level measurement and water clarity measurement
  • Sequential Batch Reactors – Blanket level measurement monitoring (floating sonar)
  • Lagoons – Bed sludge level measurement
  • Lamella Clarifier – Bed level measurement and floc level measurement
  • Mining/Process Clarifiers, thickeners, CCD’s, settling ponds/lagoons, water treatment, carbon columns


  • Dual independent analogue outputs to track two different interfaces, or clarity simultaneously, with the one sonar sensor
  • Easy calibration to track specific density interfaces, eg: floc / fluff layer – 1g/l, Bed 10g/l+
  • Industrial scum cleaning mechanisms, that do not require maintenance
  • No wiper blade assemblies
  • Control room graphics of tanks and interfaces via GosHawk II
  • Wide range of communications: Modbus, HART, Foundation, Fieldbus, DeviceNet, Profibus DP and Profibus PA
  • 3G remote support capability for calibration, commissioning or technical back-up
  • 3 programmable relays

Measurement Range Max

25 Metres (82ft)

Power Requirements

24V dc ±10%, 90 to 250V ac (50-60Hz)

Transmitter Outputs


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