JAMES RICHARD FARRIS, JR
Pilots at Buena Vis Way, New Castle, PA

4502044, Feb 26, 1985

May 19, 1982

6/379619

James R. Farris - New Castle PA

G08B 2100, G01W 114

340604

This invention is directed to a system for detecting the presence of moisture in a given location such as the attic of a building or house before the moisture has had an opportunity to penetrate plaster walls or cause other damage. The disclosed invention includes a detector for detecting the presence of minute quantities of moisture contemporaneous with their initial appearance, which responds to the presence of moisture by exhibiting a decrease in its internal impedance. An audible signal-generating circuit is coupled to the detector and responds to the resultant decrease in the impedance of the detector by commencing to oscillate at a pre-determined audio frequency. Since it is possible that prior to the discovery of the alarm signal the moisture may have evaporated, which ordinarily might cause the impedance through the detector to return to its normal value and thus terminate the audible signal, there is additionally provided a circuit to sustain the signal for an indefinite period of time even after the evaporation of the moisture which thus permits the discovery of the existence of moisture at a later time.