8100 and 8200 Sludge Blanket Detectors

sludge monitoring

The 8100 and 8200 monitors provide an exceptionally simple and reliable method of detecting the sludge blanket level in clarifiers and settlement tanks in wastewater, drinking water and industrial effluent treatment.

Control of the sludge blanket level is essential to ensure discharge consent compliance and efficient control of the treatment process. If the sludge blanket in a settlement tank is allowed to rise close to the surface there is a danger that solids will leave the tank and contaminate the next process stage or be discharged into the water course. Alternatively, if the sludge blanket is not allowed to stabilise, form a blanket or is pumped out too frequently, the settlement process does not take place at all and solids will remain in suspension.

Our infrared sensors are ideally suited to monitoring the top of the sludge/water interface ensuring early detection of any rising sludge that represents a threat to the treatment process and effluent quality.

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  • The 8100 Monitor is suitable for mounting outdoors on the bridge of settlement tanks, as the enclosure is IP65 rated and no outer enclosure is required, although outer protection is often preferable to avoid degradation of the enclosure due to environmental conditions. 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.

    The 8200 Monitor is a two channel version of the monitor providing the option of alarming at two positions in a tank or on two tanks that are located close together.

    Partech offer a selection of sensors that are for use in conjunction with our range of Sludge Blanket monitoring instruments. 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. 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. Advice on sensor selection is included in the brochure and our engineers are available to provide further advice if required.

  • Physical
    Dimensions (hxwxd) 160 x 195 x 105 mm
    Weight 1 kg
    Protection Class IP65
    Enclosure Material ABS
    Cable Entry 4 x M20 (cable 5 to 10 mm)
    Cable Core Size Max Conductor Size 2.5 mm²

    Power Supply 100 to 240VAC 50/60 Hz
    9 to 36VDC option vailable
    Power Rating 8 W

    Environmental Data
    Temperature Monitor: -20 to 60ºC
    Sensor: 0-40°C
    Location Indoor/Outdoor

    User Interface
    Local Annunciation
    Green LED for Normal
    Red LED for Blanket Alarm
    Orange LED for Fault

    Adjustment 5 – 95% of Sensor Range
    Response Time 1 to 90 Seconds

    Number 2, 1 Blanket High, 1 System Fault
    Type SPCO
    Rating 5 A @ 230VAC, 5A@125VDC

  • The 8100 and 8200 Monitors are offered with a choice of sensors, the details below give information about the specifications of the sensors.

    Measurement Characteristics
    Principal of Operation Light Attenuation
    Wavelength 960 nm Infrared
    Accuracy +/- 1 cm of interface
    Accuracy will depend on the settling characteristics of the solids and can vary during operation of the plant
    Response Time 0.5 seconds
    Flowrate Not affected by flowrate

    Environmental Data
    Pressure Rating 10 mWC
    Physical Data
    Weight 0.35 kg (inc 10 metres of cable)
    Enclosure Rating IP68
    Enclosure Material Moulded Epoxy Resin
    Cable Length 10 metres standard, 100 metres maximum
    Service Requirement No routine servicing
    The sensor will require manual cleaning, the frequency is application dependent

    Sensor Selection

    Range: 0-200 mg/l
    Optical Path: 100 mm
    Special Application Only

    Range: 0-1,500 mg/l
    Optical Path: 40 mm
    Wastewater Treatment – Final Settlement and Humus Tanks
    Drinking Water Treatment – Clarifers

    Range: 0-10,000 mg/l
    Optical Path: 15 mm
    Wastewater Treatment – Primary Settlement Tanks
    Drinking Water Treatment – Picket Fence Thickeners

    Range: 0-30,000 mg/l
    Optical Path: 8 mm
    Wastewater Treatment – Picket Fence Thickeners

  • Part Number with Description
    163600 8100 Monitor – Single Channel Sludge Level Detector (85 to 264VAC, 1 x Alarm Relay & 1 Fault Relay)
    223644 8100 Monitor – Single Channel Sludge Level Detector (9 to 36VDC, 2 x Alarm Relay & 1 Fault Relay)
    163610 8200 Monitor – Dual Channel Sludge Level Detector (85 to 264VAC, 2 x Alarm Relay & 1 Fault Relay)
    223646 8200 Monitor – Dual Channel Sludge Level Detector (9 to 36VDC, 2 x Alarm Relay & 1 Fault Relay)

    Monitor Bracket
    226370 FlexTech Monitor Bracket Assembly (7200/8100/8200 Monitor, Handrail

    102200 IR100 Sensor – 8100/8200/7200 (Cable Length: 10 metres) Range 0-200 mg/l
    101900 IR40 Sensor – 8100/8200/7200 (Cable Length: 10 metres) Range 0-1,500 mg/l
    101600 IR15 Sensor – 8100/8200/7200 (Cable Length: 10 metres) Range 0-10,000 mg/l
    148120 IR8 Sensor – 8100/8200/7200 (Cable Length: 10 metres) Range 0-30,000 mg/l

    Sensor Bracket
    171290 Mounting Bracket – IR, Soli-Tech 20v2 (Handrail)

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