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SludgeWatch 715 Sludge Blanket Detector

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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  • Overview
  • General Specification
  • Sensor Specification
  • Ordering Information

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.

Dimensions (hxwxd)280 x 230 x 130 mm
Weight1.7 kg including sensor and 10 metres of cable
Protection ClassElectronics: IP54
Sensor: IP68
Enclosure MaterialDark Blue Nylon
Cable Length10 metres standard, 15 metres maximum
Power Supply9V Battery (PP3)
Battery Life6 months typical use
Environmental Data
Operating Temperature0 to 40ºC, limited by the risk of ice formation interfering with the measurement
Storage Temperature-20 to 60ºC
User Interface
DisplayFront Panel LED - 'ON' in Sludge
Audible OutputShort Tone in Water
Long Tone in Sludge
Measurement Characteristics
Principal of OperationLight Attenuation
Wavelength960 nm Infrared
Accuracy+/- 1 cm of interface
ResolutionStandard cable markings every 1.0 metres
Units of Measurementmetres
Response Time0.5 seconds
Sensor Selection
IR100Range: 0-200 mg/l
Optical Path: 100 mm
Special Application Only
IR40Range: 0-1,500 mg/l
Optical Path: 40 mm
Wastewater Treatment - Final Settlement and Humus Tanks
Drinking Water Treatment - Clarifers
IR15Range: 0-10,000 mg/l
Optical Path: 15 mm
Wastewater Treatment - Primary Settlement Tanks
Drinking Water Treatment - Picket Fence Thickeners
IR8Range: 0-30,000 mg/l
Optical Path: 8 mm
Wastewater Treatment - Picket Fence Thickeners
Part NumberDescription
107800SludgeWatch 715 Portable c/w IR100 Sensor (Cable Length: 10 metres)
100610SludgeWatch 715 Portable c/w IR40 Sensor (Cable Length: 10 metres)
107790SludgeWatch 715 Portable c/w IR15 Sensor (Cable Length: 10 metres)
141300SludgeWatch 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.

Examples are: Duracell: MN1604 or Energizer: PP3 9V



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