Liquid level control

Details Liquid level control Liquid level control

1977-08-19

1980-04-01

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

With plural separate drive motor controlling elements

417 45, F04B 4902, F04B 4906

Patent

active

041959680

ABSTRACT:
A liquid level control for the operation of a sump pump or the like intermittently removing liquid from a sump or pit. The control starts the pump when the liquid level reaches a preset high level and maintains the pumping until the liquid reaches a preset low level. The control comprises a first switch which closes in response to the liquid crossing the preset upper level and a second switch preferably in parallel therewith which closes in response to pump motor current such that when the first switch starts the pump, the second switch maintains the pump in the on position.

REFERENCES:
patent: 2697195 (1954-12-01), Courtney
patent: 2811019 (1957-10-01), Courtney
patent: 2856574 (1958-10-01), Schaeffer
patent: 2947931 (1960-08-01), Hubby
patent: 3778694 (1973-12-01), Hubby et al.
patent: 3829241 (1974-08-01), Emeny
patent: 3858102 (1974-12-01), Quinn

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