Flow Measurement & Control

Underwater sludge blanket level monitor

April 2003 Flow Measurement & Control Products

DLM is now offering the MSL600 sludge blanket monitor that is a microprocessor based system with a range of built-in, display, control and alarm features. Easy to use menu-driven programming allows complete configuration of the unit.

Local programming is carried out via a membrane keyboard. The MSL600 uses the sonar principle, with an ultrasonic pulse transmitted underwater. Sophisticated echo processing allows the MSL600 to analyse the returning pulse of ultrasound, which is transmitted vertically and reflects from the surface of the sludge blanket. The system captures the ultrasonic echoes reflected from the blanket interface.

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 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.

Applications include: Primary and secondary clarifiers in waste water applications, circular rotating or static clarifiers, rectangular clarifiers with moving or static bridges, most Lamella clarifiers, picket fence thickener sludge blanket levels.

Features include a human machine interface, an integral radio link and a self-cleaning design. Benefits to be had by the user include low maintenance, cost saving on otherwise expensive cable runs, remote communications and ease of calibration.

For more information contact, Dave Rosser, DLM, 011 457 0500, dave@dlm.co.za, www.dlm.co.za

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