Liquid selective automatic bilge pump control

Details Liquid selective automatic bilge pump control Liquid selective automatic bilge pump control

1987-03-25

1989-02-14

Goldberg, E. A.

Electrical resistors

Mechanically variable

Liquid resistance element

338 28, 324446, H01C 1002

Patent

active

048049360

ABSTRACT:
A highly reliable bilge pump control system which distinguishes between oil and water and operates without a mechanical float switch. It uses a conductivity type probe of special construction which is unaffected by sludge and contamination at the oil-water interface. Multiple probes at varying depths feed high impedance operational amplifiers which operate a conventional pump through digital circuitry which assures that no oil is pumped from the bilge.

REFERENCES:
patent: 4125822 (1978-11-01), Perren et al.
patent: 4382173 (1983-05-01), Howard-Leicester
patent: 4507521 (1985-03-01), Goellner
patent: 4626786 (1986-12-01), Bodecker et al.
patent: 4638291 (1987-01-01), Puscasu

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