Moisture detector
US4692752A · kind A · utility
11Cited by
10References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 27, 1984 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Aug 27, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M3/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.