ORCA - Sonar Level System

ORCA - Sonar Level System

Principle of Operations

The ORCA Sonar 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
    Secondary and final Clarifiers - RAS Blanket and fluff/pin floc layer
    Thickeners and DAF - Bed level and clarity of water
    Sequential Batch Reactors - Blanket monitoring (floating sonar)
    Lagoons - Bed sludge level
    Lamella Clarifier - Bed level and floc level
  • 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.
  • Full range of sonar transducers to optimize detection of heavy and light density interfaces.
  • Widest range of sonar frequencies to optimize performance.
  • Easy calibration to track specific density interfaces. eg: RAS blanket - 4g/l, floc/fluff layer - 1g/l.
  • Industrial scum cleaning mechanisms, that do not require maintenance.
  • No wiper blade assemblies.
  • Control room graphics of tanks and interfaces.
  • Wide range of communications: Devicenet, GosHawk, HART, Modbus, Profibus DP Foundation Fieldbus and Profibus PA
  • CDMA/GSM remote support capability for calibration, commissioning or technical back-up.
  • Relay alarms



ORCA Sonar Sludge Level Datasheet