Apparatus for monitoring and controlling liquid level

Details Apparatus for monitoring and controlling liquid level Apparatus for monitoring and controlling liquid level

1978-11-20

1980-01-29

Yasich, Daniel M.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

73313, 200 84C, 335206, 417 40, H01H 4700

Patent

active

041864190

ABSTRACT:
An apparatus for monitoring and controlling the liquid level in a storage tank which involves placing at least two magnetically operated switches, e.g., magnetic-reed switches, at different levels in the tank and causing a magnet-containing float to move in response to the liquid level to activate these switches. A relay operates upon activation of the higher of these switches to start electrical current flowing to operate a discharge pump, thereby controlling the liquid level in the tank. In a preferred embodiment, a third magnetically operated switch is employed so that when the magnet activates the third switch at least one indication, e.g., sound and/or light alarm, is given that the liquid level is at least at a predetermined level.

REFERENCES:
patent: 3397347 (1968-08-01), Hoeppel
patent: 3437771 (1969-04-01), Nusbaum
patent: 3685357 (1972-08-01), Alexander
patent: 3787733 (1974-01-01), Peters
patent: 3826139 (1974-07-01), Bachman
patent: 4064755 (1977-12-01), Bongort
patent: 4135137 (1979-01-01), Thomas

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