Capacitance level sensor for a bilge pump

Details Capacitance level sensor for a bilge pump Capacitance level sensor for a bilge pump

1988-12-14

1989-11-21

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 36, 417 44, 73304C, F04B 4902, F04D 2700, G01R 2726

Patent

active

048818739

ABSTRACT:
A bilge pump switch sensing the presence of bilge water by measuring the density of water by using an ultrasonic field penetrating the water, the field extending through the housing of the switch. Thus the internal elements of the switch are isolated from any contact with the water. The ultrasonic field detecting the presence of water activates sensing means in said switch housing to activate the pump, delay means being provided against false pump starts due to wave action as caused by a rocking boat.

REFERENCES:
patent: 4171932 (1979-10-01), Miller
patent: 4226118 (1980-10-01), Aldrich
patent: 4245188 (1981-01-01), Rottman
patent: 4470008 (1984-09-01), Kato
patent: 4484862 (1984-11-01), Jensen
patent: 4678403 (1987-07-01), Rudy et al.

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