ASLD2200 Sludge Blanket Monitor

infrared sludge blanket sensor

Continuous Sludge Blanket Level Monitoring – Infrared Sensor

The ASLD2200 is a fully automatic sludge blanket level detector designed for the water and waste water industry. It utilises a servo-driven sensor which continually tracks the settled interface with the sensor at the very top of the interface zone.

Continuous monitoring of the sludge/water interface or sludge blanket is central to the efficient operation of clarifiers, thickeners and settlement tanks. Reliable measurement enables a control system to maintain the optimum depth of sludge in the tank. A sludge interface that is too high can result in pollution incidents caused by carry-over from a final settlement tank. The sludge can also become too thick to extract easily or can turn septic if left too long. If there is insufficient sludge in the tank the settlement process cannot operate correctly and the solids will tend to remain in suspension.

Our infrared sensors are ideally suited to monitoring the sludge/water interface even when the settlement process is not working effectively and the interface has become indistinct.

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  • The ASLD2200 is supplied with a sensor that uses infrared attenuation as the principle of operation which allows Partech to ensure sufficient sensitivity to monitor sludge blankets in a wide variety of applications. It should be noted that sensor selection can be site dependent. Partech are happy to provide full support in the selection of the correct sensor.

    The sensor will normally be positioned in the area of the tank just above the sludge and will therefore be kept away from the worst of the fouling that can occur in the treatment of either potable or dirty water. Provision must be made for transmission of the output signal to the control system; this is normally possible via spare slip rings. Where this is not possible a radio telemetry option is available, allowing transmission directly to the control system without the need for installation of cables.

    When monitoring the Sludge Blanket Level in settlement tanks it is important to ensure that the sensor is sensitive enough to detect low density solids before ‘carry-over’ to the next process stage occurs, ensuring that potential pollution events are highlighted prior to occurrence. At the same time the sensor should not be ‘blinded’ by solids in the supernatant.

  • Physical
    Dimensions (hxwxd) 490 x 350 x 382 mm
    Weight 15 kg
    Protection Class IP55 Outer Enclosure with IP65 electronics housing
    Enclosure Material GRP Outer Enclosure with Polycarbonate inner
    Cable Entry 3x M20
    Cable Core Size Max Conductor Size 2.5 mm²

    Electrical
    Power Supply 85 to 264 VAC 47-65 Hz
    Power Rating 25W

    Environmental Data
    Operating/Storage Temperature 0 to 50ºC
    Location Indoor/Outdoor

    User Interface
    Display 3 Digit, 7 Segment LED Display of 0-100%
    Setup Potentiometer and Push Buttons on main PCBA
    Units of Measurement %age Depth
    Output Signals
    Analogue Output 4-20 mA, max load 500 ohm
    Relays 1, set at 0 and 100% and is not adjustable
    Contacts Contact Closure, 0.55 A @ 100VDC
    Local Annuication 6 LED’s on main PCBA

  • here is a choice of sensors for use with the ASLD2200, all the sensors use infrared attenuation as their operating principle, this makes them sufficiently sensitive for use on thin water treatment sludges as well as the more usual sewage treatment applications.

    Physical
    Dimensions (hxwxd) 490 x 350 x 382 mm
    Weight 15 kg
    Protection Class IP55 Outer Enclosure with IP65 electronics housing
    Enclosure Material GRP Outer Enclosure with Polycarbonate inner
    Cable Entry 3x M20
    Cable Core Size Max Conductor Size 2.5 mm²

    Electrical
    Power Supply 85 to 264 VAC 47-65 Hz
    Power Rating 25W

    Environmental Data
    Operating/Storage Temperature 0 to 50ºC
    Location Indoor/Outdoor

    User Interface
    Display 3 Digit, 7 Segment LED Display of 0-100%
    Setup Potentiometer and Push Buttons on main PCBA
    Units of Measurement %age Depth
    Output Signals
    Analogue Output 4-20 mA, max load 500 ohm
    Relays 1, this alarms at 0 and 100% and is not adjustable
    Contacts Contact Closure, 0.55 A @ 100VDC
    Local Annuication 6 LED’s on main PCBA

  • Part Number with Description
    167430 ASLD2200 Monitor for IR and Soli-Tech 20v Sensors
    Sensors
    102201 IR100 Sensor – ASLD2200 (Cable Length: 10 metres) – Range 0-200 mg/l
    101901 IR40 Sensor – ASLD2200 (Cable Length: 10 metres) – Range 0-1,500 mg/l
    101601 IR15 Sensor – ASLD2200 (Cable Length: 10 metres) – Range 0-10,000 mg/l
    148121 IR8 Sensor – ASLD2200 (Cable Length: 10 metres) – Range 0-30,000 mg/l

    Mounting Bracket
    101170 Mounting Bracket – ASLD2200



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