Water detection device

Details Water detection device Water detection device

1979-10-01

1981-10-27

Caldwell, Sr., John W.

Communications: electrical

Condition responsive indicating system

Specific condition

137 781, 174117A, 200 6105, 340605, 340620, 340636, G08B 2100, F16K 2300

Patent

active

042976863

ABSTRACT:
A resistive liquid detection and shut-off system is used to protect a floor area from water damage. An elongated sensor comprising a flexible plastic tape with an adhesive backing and a pair of conductive metal strips detects liquid drips, flows and trickles, but not liquid beads. A detection circuit measures resistivity changes in the sensor, and an output circuit activates a solenoid-operated water shut-off valve in response to predetermined resistivity changes in the sensor. A connector comprising a body of electrically insulating material with electrical terminals thereon connects portions of the elongated sensor together so that they can have any length and relative position. A battery may provide the power for the entire system, with a battery voltage monitoring circuit also provided.

REFERENCES:
patent: 2735907 (1956-02-01), Inman
patent: 2749382 (1956-06-01), Lockard
patent: 3200388 (1965-08-01), Uhlig
patent: 3221317 (1965-11-01), Ferrigno, Jr.
patent: 3562731 (1971-02-01), Hsu
patent: 3594751 (1971-07-01), Ogden et al.
patent: 3770002 (1973-11-01), Brown
patent: 3778570 (1973-12-01), Shuman
patent: 3824460 (1974-07-01), Gustafson
patent: 3882476 (1975-05-01), Lofgren
patent: 4020478 (1977-04-01), Hatfield
patent: 4069817 (1978-01-01), Fendle et al.
patent: 4106001 (1978-08-01), Mahoney

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