Immersion responsive sensor

Communications: electrical – Systems – Call station

Patent

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Details

340332, G08B 2100

Patent

active

039421678

ABSTRACT:
Apparatus responsive to immersion in water to complete an electrical circuit through which a signalling means is energized from an electrical energy source includes a sensor which is salt or fresh water actuated depending on the sensitivity of the circuitry utilized in conjunction with the sensor. The sensor comprises an outer peripheral shield, such as an outer conductor, and an inner conductor, or pair of inner conductors, wherein air holes or slots are provided in the outer shield so as to enable the venting of air from within the interior of the outer shield at substantially any depth of immersion of the sensor in water less than total immersion while preventing the inadvertent entry of splash water prior to such immersion. In this manner water may enter within the outer shield interior to contact the conductor elements and complete the electrical circuit at immersion depths where the water pressure is normally insufficient to cause such entry without venting of the air.

REFERENCES:
patent: 2452615 (1948-11-01), Thomson
patent: 2792566 (1957-05-01), Shanhouse
patent: 2999230 (1961-09-01), Laakmann
patent: 3311983 (1967-04-01), Green

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