Pump control circuit

Details Pump control circuit Pump control circuit

1982-06-18

1984-08-21

Look, Edward K.

Pumps

Condition responsive control of pump drive motor

Having timer or delay means

417 36, 417 44, 417 63, F04B 4900

Patent

active

044667779

ABSTRACT:
A circuit for controlling a pump for pumping a column of gasoline floating on a column of water. A first probe is positioned at the level of the pump intake and a second probe is positioned beneath the first probe. A float switch is positioned adjacent the pump intake for providing a signal when the pump is immersed in liquid. The float switch and the probes are operatively connected to an AND gate circuit which generates a preselected signal when both probes are immersed in a nonconducting liquid. A time delay is operatively connected to the AND gate and begins a timing period responsive to the preselected signal. At the end of the timing period, the time delay provides a signal which energizes the pump. A latch circuit maintains the pump in an energized condition until both probes are again immersed in water.

REFERENCES:
patent: 4112291 (1978-09-01), Fukuyama et al.
patent: 4171932 (1979-10-01), Miller
patent: 4265262 (1981-05-01), Hotine
IBM Technical Disclosure Bulletin, "Direct Digital-to-Analog Values Storage", J. W. Beck, vol. 9, No. 4, Sep. 1966.
Schematic Diagram.

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