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SludgeWatch Ultra Sludge Blanket Monitor

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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View Related Product Documents
  • SludgeWatch Ultra Monitor
  • SludgeWatch Ultra Transducer
  • General Specification
  • Measurement Specification
  • Ordering Information

The 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.

The 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.

Dimensions (hxwxd)Transmitter: 235 x 184 x 120 mm
Transducer: Ø78 mm x 185 mm long
Weight1 kg
Protection ClassTransmitter: IP65
Transducer: IP68
Enclosure MaterialTransmitter: Polycarbonate, Flame Resistant to UL94-5V

Transducer: Black Valox 357 with a 316 Stainless Steel Wiper Blade and Shaft
Cable EntryKnockouts for 5x M20, 1x M16 in base and 4x PG11 at rear
Power Supply100 to 240 VAC 50/60 Hz
22 to 28 VDC
Power Rating14 W maximum, typcially 11W
Transducer Cable Length10 metres standard, 200 metres maximum
Environmental Data
Operating/Storage Temperature-20 to 50ºC
User Interface
Display192 x 128 pixel illuminated graphical dispplay
KeypadIntegral Keypad with menu navigation keys
Units of Measurement%age Depth
Output Signals
Analogue Outputs2x 0/4-20 mA, max load 1000 ohm
ContactsSPDT, 5A @ 240 VAC
Communication BusRS485 Modbus RTU/ASCII or Profibus DPV0 or V1
Measurement Characteristics
Principal of OperationUltrasonic
Accuracy0.25% of the measured range or 30 mm (whichever is the greater)
Resolution0.25% of the measured range or 10 mm (whichever is the greater)
Maximum Range10 metres
Minimum Range0.3 metres
Part NumberDescription
224290SludgeWatch Ultra Monitor (100 to 240 VAC, 22 to 28 VDC, 2x 0.4-20mA Output, 6 Relay Outputs)
224292SludgeWatch Ultra Transducer (Cable Length: 10 metres)
224293SludgeWatch Ultra Transducer (Cable Length: 20 metres)
224681SludgeWatch Ultra Transducer Mounting Bracket Assembly, Shaft 2.0 metres
223444SludgeWatch Ultra Transducer Mounting Bracket Assembly, Shaft 2.5 metres
223442SludgeWatch Ultra Transducer Mounting Bracket Assembly, Shaft 3.0 metres

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