Pulsar SLUDGE FINDER 2, Instruction Manual

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Page 17
Transducer (Sensor)
Locating the Sludge Transducer

Position the transducer at an elevation in the tank such that it is fully
submerged at all times that measurements are required, typically the
face of the transducer should be
150mm below the normal water level.
The temperature compensation will only function correctly if the
transducer is submerged at this level or below
.

Ensure an unobstructed path between the transducer and the bottom of
the tank. N.B. Rotating subsurface rakes and flights that pass beneath
the transducer do not interfere with normal operation.

Select a location that minimizes the presence of gas bubbles, high flow
and heavy solid concentration dynamics in the process liquid near the
transducer.

Typical installation in a round clarifier or thickener is 1/3 to 2/3 the
distance from the sidewall to the centre of the tank with the transducer
mounted from the walkway safety railing.

Typical installation in a rectangular clarifier or thickener is along the
length of the clarifier in the third of the tank nearest the sludge
discharge sump.
Installing the Transducer

The transducer housing is designed to accept a 1 inch BSP female
threaded coupler for pipe or conduit. Feed the integral transducer cable
through the mounting pipe and tighten by hand until snug.
CAUTION:
extreme over-tightening may crack the transducer housing.

Position the transducer such that it is 150mm below the water surface
and the mounting pipe is perpendicular to the water surface. Secure the
mounting pipe in place with clamps to ensure that it is rigid.

Flexible arm transducers assemblies are available and are required
where there is surface skimming equipment that passes the location of
the transducer. Rotate the transducer mounting pipe so that the integral
transducer shield contacts the skimmer arm squarely. Ensure that the
transducer moves freely away from the passing skimmer equipment.

Optional transducer mounting brackets are available to extend the
mounting pipe away from its connection point at the handrail to provide
clearance from obstructions.

If desired, the transducer cable may be extended up to 200m. Install
transducer cables in grounded metal conduit. Do not run in cable trays
or duct banks with variable frequency drives or other high voltage
sources.