Communications: electrical – Systems – Call station
Patent
1975-11-10
1978-01-10
Caldwell, Sr., John W.
Communications: electrical
Systems
Call station
340235, 324 65P, G08B 2100
Patent
active
040682218
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. The venting passageway extends substantially the full longitudinal extend of the outer electrical shield and also acts as a waveguide to restrict electromagnetic, RF and electrostatic interference from entering through the outer shield which could inadvertently turn on the sensor. Ferrite beads or a lossy dielectric may also be utilized to further prevent inadvertent operation of the sensor as a result of such electromagnetic, RF and electrostatic interference. As a result of such venting of air, 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:
stackpole: Ceramag (Ferrite) Shielding Beads; Ferrite Beads, by L. Solomon, from Electronics World, p. 42.
Caldwell Sr. John W.
McClintock Manufacturing Corporation
Myer Daniel
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