Sludge Watch 715

sludge blanket detection

Sludge Blanket Detection Made Easy

The SludgeWatch 715 provides a simple, low cost method of spot checking the sludge blanket level in a wide variety of settlement tanks. The cable reel design removes the need for any additional carrying bag.

The sludge blanket is detected by winding the sensor down into the tank, the audible tone will change and the LED illuminates once the sensor has reached the blanket.

This method of sludge blanket detection offer major improvements over traditional SludgeJudge type systems in terms of both repeatability and importantly health and safety – no more manhandling 4 metre tubes full of contaminated wastewater.

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  • Reliable detection of the sludge interface is necessary to allow operators to de-sludge tanks at the right time. Emptying the tank too often is inefficient in terms of manpower and can have knock on effects on the operation of other parts of the sludge treatment system. Equally allowing the tank to have too much sludge can cause carry over to the next process stage or into the local watercourse. Neither scenario is desirable, and the 715 will provide a quick and easy check on the interface position without relying on operator judgement.

    The SludgeWatch 715 uses a range of infrared sensors to make the sludge interface detection. Infrared attenuation has been selected as it is ideally suited to detecting the sludge present in the interface zone. This tends to be considerably ‘thinner’ than the sludge that is present at the bottom of a settlement tank.

  • Physical
    Dimensions (hxwxd) 280 x 230 x 130 mm
    Weight 1.7 kg including sensor and 10 metres of cable
    Protection Class Electronics: IP54
    Sensor: IP68
    Enclosure Material Dark Blue Nylon
    Cable Length 10 metres standard, 15 metres maximum

    Power Supply 9V Battery (PP3)
    Battery Life 6 months typical use

    Environmental Data
    Operating Temperature 0 to 40ºC, limited by the risk of ice formation interfering with the measurement
    Storage Temperature -20 to 60ºC
    Location Indoor/Outdoor
    User Interface
    Display Front Panel LED – ‘ON’ in Sludge
    Audible Output Short Tone in Water
    Long Tone in Sludge

  • Measurement Characteristics
    Principal of Operation Light Attenuation
    Wavelength 960 nm Infrared
    Accuracy +/- 1 cm of interface
    Resolution Standard cable markings every 1.0 metres
    Units of Measurement metres
    Response Time 0.5 seconds

    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
    107800 SludgeWatch 715 Portable c/w IR100 Sensor (Cable Length: 10 metres)
    100610 SludgeWatch 715 Portable c/w IR40 Sensor (Cable Length: 10 metres)
    107790 SludgeWatch 715 Portable c/w IR15 Sensor (Cable Length: 10 metres)
    141300 SludgeWatch 715 Portable c/w IR8 Sensor (Cable Length: 10 metres)

    The SludgeWatch 715 uses standard PP3 batteries that are available from any hardware or electrical store.

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