Sludge Finder 2 Pulsar Sludge Blanket Level Detector

Pulsar’s Sludge Finder 2 is a controller and transducer system that provides reliable continuous sludge blanket level measurement. It is used in thousands of applications worldwide for detecting sludge blanket levels in primary, secondary, tertiary settlement tanks either with stationary or travelling bridges, clarifiers, gravity thickeners or sequencing batch reactor (SBR) systems.

The two-part system includes a Viper Transducer which is purposely designed for sludge blanket level measurement. This purpose-built sludge level sensor uses sonar technology it is submersed into the liquid and detects the echoes from the material - any distinct density changes are reflected back to the transducer, the time taken for the echo to return is transmitted to the controller and the distance to the interface is calculated.


  • Self-Cleaning Viper Sludge Sensor
    The Viper sludge transducer can be positioned up to 200m (656ft) from the controller and has a measurement range of 0.3m to 10 metres (0.98 - 32.8ft) - accuracy is 0.25% of the measured range. A tight 6° beam angle makes confined or cluttered applications easy and the self-cleaning face removes the need for regular inspection and maintenance – meaning you can avoid that unhygienic and hazardous task you hate!
  • Easy Set-up
    The Sludge Finder 2 controller is easy to install by following the on-screen menu driven set-up - simply follow the screen prompts to enter your application parameters and then the system automatically tracks the sludge blanket interface.
  • Flexible - User Specific
    Sludge Finder 2 offers a wealth of different options depending on requirements for your application



Dimensions:235 x 184 x 120mm (9.25 x 7.24 x 4.72in) Wall mount only
Weight:Nominal 1kg (2.2lbs)
Enclosure material/description:Polycarbonate, flame resistant to UL94-5V
Cable entry detail:10 cable entry knock outs, 5 x M20 and 1 x M16 underside. 4 x PG11 at rear
Transducer cable extensions:2 twisted pair 0.5mm2 with overall screen
Maximum separation:200m (656ft)


Enclosure protection:IP65 / NEMA 4X
Max. and min. temperature (electronics):-20°C to +50°C (-4°F to +122°F)


CE approvals:2014/30/EU & 2014/35/EU - EMC Directive. Standards applied: EN 61010-1:2010 / EN 61326- 1:2013 / EN 55011 / EN 61000 (3-2 / 3-3 / 4-2 / 4-3 / 4-4 / 4-5 / 4-6 / 4-7 / 4-11
ATEX approval:Controller must be within a safe area


Analogue outputs:2 off isolated (to 150V floating) output of 4-20mA or 0-20mA into 1kΩ (user programmable and adjustable) 0.1% resolution
Digital output:Half duplex RS232
Volt-free contacts, number & rating:6 form “C” (SPDT) rated at 5A at 115V ac
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.
Radio modem (optional):4-20mA using wireless exempt frequencies. Maximum range 500m (1640ft) line-of-sight
Communication bus (optional):RS485 Modbus RTU/ASCII or Profibus DPV0 or DPV1 (slave device)


On-board programming:By integral keypad.
PC programming:Via RS232
Programming security:Via passcode (user selectable and adjustable)
Programmed data integrity:Via non-volatile memory
PC software:Sludge Finder PC within PC Software Suite - compatible with XP (service pack 3), Windows 7/8/10


Operating voltage:Universal 100-240V ac 50-60Hz, 22-28Vdc.
Power consumption:20W maximum power (typically 11W)
Fuse:2A slow blow

Download Datasheet: Sludge Finder 2 Pulsar Sludge Blanket Level Detector

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