Electrical transmission or interconnection systems – Switching systems – Condition responsive
Patent
1993-08-06
1995-04-04
Gaffin, Jeffrey A.
Electrical transmission or interconnection systems
Switching systems
Condition responsive
73304R, G01F 2300
Patent
active
054040485
ABSTRACT:
The invention relates to a liquid sensing switch for use primarily in sensing the bilge water level aboard a boat. The switch is designed with a high input impedance and a high trigger sensitivity, so that the presence of a liquid may be detected by using a remotely located single wire probe. The probe is able to sense immersion into low conductivity liquids or into liquids where no hardwired ground is provided, such as within fiberglass boat hulls. In order to prevent false triggering and cyclic operation of the bilge pump, the liquid sensing switch provides a time delay before it is activated, as well as a further time delay before being deactivated.
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patent: 4171932 (1979-10-01), Miller
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patent: 4678403 (1987-07-01), Rudy et al.
patent: 4697535 (1987-10-01), Wileman, III
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patent: 5097248 (1992-03-01), Kumada et al.
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"Bilge Tender" Advertisement, Florida Sportsman, Jul. 1990, p. 186.
"Bilge Tender" product brochure, 1990.
Jabsco Bilge Pump Switch Advertisement.
"Water Witch" Product Advertisment, Sensatron, Inc., 1987.
Product Packaging from the "Hydro-Air" Switch, Manufactured by Jabsco Products (Date unknown).
Aim Technologies, Inc.
Gaffin Jeffrey A.
Ganjoo Peter
Goldman Joel S.
Kirsch Gregory J.
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