Sludge Finder 2

The Sludge Finder 2 provides reliable and continuous sludge blanket level measurement. The two-part system has been purposely designed for sludge blanket level measurement, operating ultrasonically through a liquid. The Sludge Finder 2 uses proven echo processing algorithms to identify the sludge interface level using state of the art technology only found in this unit!

Sludge blanket level control is a crucial aspect of any process that includes primary settlement tanks, secondary settlement tanks, tertiary settlement tanks either with stationary or traveling bridges, clarifiers, gravity thickeners, or sequencing batch reactor systems. Sludge blanket level measurement works by measuring the distance between the sludge blanket surface and the water level. Once the sludge has reached the required density, the accompanying controller will then switch on the pumps and pump the sludge through into digesters, ready for the next treatment stage.

Effective sludge blanket level measurement can help treatment plants or industrial processes to generate their own electricity, ensure that pumps are being used efficiently, ensure that excess sludge is not being pumped into our local water sources, aids with compliance to health, safety, and environmental regulations, and finally, ensures that further sludge handling processes such as thickeners and dewatering equipment are all performing to their maximum with the correct concentration of sludge.


  • Continuous single or dual-channel level control
  • High-frequency gives high-reliability long term
  • Self-cleaning transducer removes the need for regular inspection
  • SBR tank applications can be monitored
  • Easy set-up via the drop-down menu on large clear display
  • The unit can track two different echoes with one transducer
  • Radio telemetry system - optional

Technical Specifications 

General Specifications
Spec: Description:
Weight 1 kg (2.2 lbs)
Cable entry details 10 cable entry knockouts, 5 x M20, and 1 x M16 underside. 4 x PG11 at rear
Operating Temperature (Electronics) -20 °C to +50 °C (-4 °F to +122 °F)
Analog output 2 x isolated (to 150 V floating) output of 4-20mA or 0-20mA into 1 kΩ (user-programmable and adjustable) 0.1% resolution
Digital output Half-duplex RS232
Display 192 x 128 pixel illuminated graphical display showing a variety of screens including echo profile. Fully programmable display options, integral keypad with menu navigation keys
PC Software Sludge Finder PC within PC Software Suite - compatible with XP (service pack 3), Windows 7/8/10
Fuse 2 A slow blow
Operating Voltage Universal 100-240 V AC 50/60 Hz, 22-28 V DC
Power Consumption 20 W maximum power (typically 11 W)
Viper Sensor Specifications
Spec: Description:
Sensor body dimensions 78 mm x 195 mm (3.07 in x 7.67 in)
Sensor body weight Nominal 1.5 kg (3.3 lbs)
Sensor body material Valox 357
Wiper blade - Stainless steel
Transducer cable extensions 4-core screened
Maximum separation 200 m (656 ft) 
Enclosure protection IP68
Accuracy 0.25% of the measured range or 10 mm (0.39 in); whichever is greater 
Resolution 0.25% of the measured range or 10 mm (0.39 in); whichever is greater
Max range 10 m (32.8 ft) 
Min range 0.3 m (0.98 ft) 
Minimum sludge density 0.5% concentration




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