Method to detect and locate a breach in a roof membrane

Details Method to detect and locate a breach in a roof membrane Method to detect and locate a breach in a roof membrane

2008-01-28

2009-10-13

Dole, Timothy J (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S693000, C324S557000

Reexamination Certificate

active

07602196

ABSTRACT:
A defect in a roof membrane is detected by applying a DC voltage between the roof deck and a perimeter conductor and using a detection probe pair to provide a signal indicative of the differences in voltage detected by the pair of probes so as to allow the operator to locate the defect by moving the probes to different locations. The probes are mounted on a rigid common frame such that the probe pair has a fixed separation and the frame includes a handle portion which allows ready manipulation of the frame carrying the probes by the operator. The receiver provides an audible signal emitter to the operator and includes a calibration circuit arranged to automatically maintain, despite changes in voltage applied between the roof deck and the peripheral conductor, a “0” set calibration point so as to indicate at the calibration point when zero difference in voltage is detected.

REFERENCES:
patent: 4110945 (1978-09-01), Sheahan
patent: 4565965 (1986-01-01), Geesen
patent: 4598273 (1986-07-01), Bryan et al.
patent: 6267000 (2001-07-01), Harper et al.

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