Fluid sensitive switching controller

Details Fluid sensitive switching controller Fluid sensitive switching controller

1978-11-06

1981-10-20

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

137392, F04B 4906

Patent

active

042957931

ABSTRACT:
An electronic controller maintains the level of fluid in a container between an upper level and a lower level defined by the location of two probes in the container. Each probe actuates a first light source-photosensor pair used for controlling a device capable of changing the fluid level in the container. In some embodiments of this invention, a second photosensor-light source pair latches the first pair to provide system hysteresis. In other embodiments, the same pair both controls the fluid level device and latches itself to provide system hysteresis.

REFERENCES:
patent: 3091252 (1963-05-01), Jones
patent: 3131335 (1964-04-01), Berglund
patent: 3339578 (1967-09-01), Smith
patent: 3498131 (1970-03-01), Rickey
patent: 3667022 (1972-05-01), Quinn
patent: 3800205 (1974-03-01), Zalar
patent: 3894240 (1975-07-01), Rose
patent: 4065277 (1977-12-01), Rose
patent: 4082666 (1978-04-01), Aradio

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