Product Description

Mobrey MSL600/Z1 Sludge Blanket Level Monitoring


  • Primary and secondary clarifiers in municipal and industrial waste water applications
  • Circular rotating or static bridge clarifiers
  • Rectangular clarifiers with moving or static bridges
  • Lamella clarifiers (providing there are no obstructions in the

    way of the transducer)

  • Sludge thickeners (Picket fence thickener)

    The principle

    The MSL600 provides a means of sensing the presence of the sludge blanket and measuring its depth in the clarifier.
    The MSL600 uses the sonar principle, with an ultrasonic pulse transmitted under water. Sophisticated echo processing allows the MSL600 to analyse the pulses of ultrasound which transmit vertically and reflect from the surface of the blanket.
    The system captures the ultrasonic echoes reflected from the blanket interface even if the interface between the blanket and supernatant is not clearly de ned. Knowing the speed of sound in the supernatant the depth of the sludge blanket is then determined from the time of flight of the echo.

    The system

    The system comprises an ultrasonic transducer and a bridge mounted control unit. These are specially designed for easy installation on a clarifier tank bridge using a mounting bracket, supplied with the system.
    The system is optimised for use with clarifiers and thickeners containing municipal and industrial wastewater treatment sludge. The bridge mounted MSL600 is a stand alone unit with a clear display of the tank profile providing a range of current and relay outputs to the user for control and alarm purposes. The MSL600 bridge mounted unit can communicate to an optional remote mounted unit situated off the clarifier bridge, via an integral radio telemetry link with a range up to 500m (line of sight). The radio telemetry option is made available to cater for applications both with and without moving bridges, where transmitting small signals through slip rings or over long distances via expensive cable runs may be problematic.