FELL Electro-Scan Sewer Leak Detector

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Principal:

Clay, plastic, concrete, reinforced concrete and brick pipes are electrical insulators
The walls of such pipes have high resistance to electrical current.
The water in the pipe has low electrical resistance
The ground has low electrical resistance
The TOTAL electrical resistance between the electrodes is very high due to the pipe wall.
A defect in the pipe that is a potential water leak will decrease the pipe wall resistance.
The current flow in the circuit will increase
The size of the current increase is related to the size of the pipe defect

Operation:

An electrode is placed in the pipe (sonde)
Another electode is placed on the surface (metal stake driven into the ground)
The water in the pipe is set at a level that ensures that the pipe is full at the sonde location.
An electric voltage is applied between the electrodes
The sonde is pulled through the pipe
The current flow between the electrodes is measured every 0.5 inch
The electrical current increases whenever the sonde passes a pipe defect.

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Metrotech Corporation, 488 Tasman Drive, Sunnyvale, CA 94089. Ph: (408) 734-1400