Optical fluid-level switch and controls for bilge pump apparatus

Details Optical fluid-level switch and controls for bilge pump apparatus Optical fluid-level switch and controls for bilge pump apparatus

1993-10-22

1995-06-20

Bertsch, Richard A.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

73293, 250901, 222 64, F04B 4900

Patent

active

054256240

ABSTRACT:
An optical bilge pump apparatus has two optical fibers with gaps cut therein and associated light transmitters-receivers. The apparatus is responsive to high and low liquid levels in the pump such that the pump is turned on when both gaps in the optical fibers are submersed in liquid, and the pump is turned off when both gaps in the optical fibers are not submersed in liquid.

REFERENCES:
patent: 4156149 (1979-05-01), Vaccari
patent: 4171932 (1979-10-01), Miller
patent: 4297588 (1981-10-01), Hastbacka
patent: 4425794 (1984-01-01), Duesbury
patent: 4836632 (1989-06-01), Bardoorian
patent: 4870292 (1989-09-01), Alpert et al.
patent: 4994682 (1991-02-01), Woodside
patent: 5238369 (1993-08-01), Farr

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