Moisture detector

Details Moisture detector Moisture detector

1984-08-27

1987-09-08

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

340508, 324 65R, G08B 2900

Patent

active

046927522

ABSTRACT:
A moisture detector for detecting the presence of moisture between two electrodes includes an AC sensing network coupled to an indicator circuit by an opto-isolator to isolate impedances between the two circuits. The battery life of the detector is extending by a unique pulsing technique that creates current drain in the sensing circuit for only brief intervals of time. The pulsing technique enables the indicator circuit to keep an electronic switch in a closed-loop security system in an on state.

REFERENCES:
patent: 3487404 (1969-12-01), Midkiff
patent: 3748635 (1973-04-01), Phillips et al.
patent: 3914753 (1975-10-01), Cho
patent: 4010458 (1977-03-01), Kopfli
patent: 4087706 (1978-05-01), Koester, Jr.
patent: 4319229 (1982-03-01), Kirkor
patent: 4422066 (1983-12-01), Belcourt et al.
patent: 4465998 (1984-08-01), Durand
patent: 4514722 (1985-04-01), Batcheler et al.
patent: 4586028 (1986-04-01), McKinzie

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