Control circuit

Details Control circuit Control circuit

1976-08-17

1977-12-27

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

250551, 307311, 137392, F04B 4900, G02B 2700, H03K 342

Patent

active

040652270

ABSTRACT:
A circuit to maintain the water level between low and high predetermined limits in a sump in which the signal from an upper limit probe operates a first lamp which illuminates a photo resistor controlling the gate of a triac. The triac turns on and enables a second lamp connected to a lower limit probe which illuminates the photo resistor and holds the triac on until the fluid level drops below the lower limit probe.

REFERENCES:
patent: 3524986 (1970-08-01), Harnden
patent: 3667022 (1972-05-01), Quinn
patent: 3777188 (1973-12-01), Mazor
patent: 3916213 (1975-10-01), Luteran
patent: 3943367 (1976-03-01), Baker

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