SludgeWatch Ultra Sludge Blanket Monitor

infrared sludge blanket sensor

Continuous Sludge Blanket Level Monitoring – Ultrasonic Sensor

The SludgeWatch Ultra utilises the industry accepted look down ultrasonic or ‘sonar’ method of detecting and tracking the interface between sludge and water in water, wastewater and industrial effluent settlement tanks and clarifiers. The cleaning wiper operates automatically to remove dirt and air bubbles that can interfere with the measurement.

By monitoring the position of the sludge/water interface the user can make process adjustments to ensure that their plant is operating at the optimum efficiency. If a blanket is allowed to rise too high in the tank there is a danger of carry-over to the effluent channel or the next processing stage, additionally strain may be placed on the scrapper mechanism. If there is too little sludge in the tank the settling process cannot work effectively, this leads to problems with sludge processing, returned sludge concentrations and carry-over to the effluent channel.

Automated sludge blanket detection removes the need for time consuming manual checks, ensuring reliable process control everyday and during unexpected weather or load conditions.

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  • SludgeWatch_Ultra_Display-300x173The easy to use system has been specifically designed for these applications and makes use of an easy drop down menu structure to allow hassle free site configuration. The monitor provides all the setup and diagnostic information required to get the best performance out of the system.

    The screen image shown to the right demonstrates the depth of information that is provided. Typically a monitor that is showing a wide ‘gate’ is indicating that the settlement process in not functioning well.

    Advanced echo processing algorithms allow the monitor to cope with variations in sludge density, material that is floating in the tanks and moving scrappers arms.The monitor can operate two transducers, allowing two tanks to be controlled from a single system.

  • sludgewatch ultra transducerThe SludgeWatch Ultra transducer incorporates a fully automatic cleaning blade. Cleaning of ultrasonic sensors in sludge blanket monitoring applications is vital to ensure that air bubbles and debris does not build up on the transducer surface.

    The cleaning mechanism on our transducer has a 0.2 mm clearance between the blade and transducer face, this avoids wear on either surface increasing the life of the system.

  • Physical
    Dimensions (hxwxd) Transmitter: 235 x 184 x 120 mm
    Transducer: Ø78 mm x 185 mm long
    Weight 1 kg
    Protection Class Transmitter: IP65
    Transducer: IP68
    Enclosure Material Transmitter: Polycarbonate, Flame Resistant to UL94-5V

    Transducer: Black Valox 357 with a 316 Stainless Steel Wiper Blade and Shaft
    Cable Entry Knockouts for 5x M20, 1x M16 in base and 4x PG11 at rear

    Power Supply 100 to 240 VAC 50/60 Hz
    22 to 28 VDC
    Power Rating 14 W maximum, typcially 11W
    Transducer Cable Length 10 metres standard, 200 metres maximum

    Environmental Data
    Operating/Storage Temperature -20 to 50ºC
    Location Indoor/Outdoor

    User Interface
    Display 192 x 128 pixel illuminated graphical dispplay
    Keypad Integral Keypad with menu navigation keys
    Units of Measurement %age Depth

    Output Signals
    Analogue Outputs 2x 0/4-20 mA, max load 1000 ohm
    Relays 6
    Contacts SPDT, 5A @ 240 VAC
    Communication Bus RS485 Modbus RTU/ASCII or Profibus DPV0 or V1

  • Measurement Characteristics
    Principal of Operation Ultrasonic
    Accuracy 0.25% of the measured range or 30 mm (whichever is the greater)
    Resolution 0.25% of the measured range or 10 mm (whichever is the greater)
    Maximum Range 10 metres
    Minimum Range 0.3 metres

  • Part Number with Description
    224290 SludgeWatch Ultra Monitor (100 to 240 VAC, 22 to 28 VDC, 2x 0.4-20mA Output, 6 Relay Outputs)
    224292 SludgeWatch Ultra Transducer (Cable Length: 10 metres)
    224293 SludgeWatch Ultra Transducer (Cable Length: 20 metres)
    224681 SludgeWatch Ultra Transducer Mounting Bracket Assembly, Shaft 2.0 metres
    223444 SludgeWatch Ultra Transducer Mounting Bracket Assembly, Shaft 2.5 metres
    223442 SludgeWatch Ultra Transducer Mounting Bracket Assembly, Shaft 3.0 metres

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