Moisture sensor

Details Moisture sensor Moisture sensor

1979-08-22

1984-01-24

Brigance, Gerald L.

Communications: electrical

Condition responsive indicating system

Specific condition

73 73, 733365, 200 6104, 200 6105, G08B 2100

Patent

active

044279760

ABSTRACT:
This invention relates to a device for sensing moisture on a metal surface such as a brake path. Since the presence of moisture on a brake path causes inefficient working of the brake, it is necessary to test for moisture. Originally this was done by hand. The present invention provides a device which can test for moisture automatically. The device comprises a pair of contacts urged against an electrically conducting surface. One contact is covered by a strip of material, for instance paper, which is an insulator when dry and a conductor when moist. If moisture is present an electrical circuit comprising the surface, the moist material and the two contacts is completed activating an alarm. The material may be salt impregnated and the contacts may be moveable over the surface. The device is for use in testing for moisture on the braking surface of colliery winding installations.

REFERENCES:
patent: 2360434 (1944-10-01), Manning
patent: 2681571 (1954-06-01), Becker
patent: 2759175 (1956-08-01), Spalding
patent: 2768370 (1956-10-01), Maninger
patent: 3253315 (1966-05-01), Elcken
patent: 3332279 (1967-07-01), Tompos et al.
patent: 3721970 (1973-03-01), Niemoth

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