Electronic device for automatically controlling the level of a l

Details Electronic device for automatically controlling the level of a l Electronic device for automatically controlling the level of a l

1977-04-07

1978-10-17

Croyle, Carlton R.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

307118, 318482, 417 44, F04B 4906, H01H 3518

Patent

active

041206118

ABSTRACT:
A device is described which comprises in combination at least one resistor means placed at a determined level on the inner wall surface of the vat, said resistor means having a resistance which is variable in response to the presence or absence of the liquid at the level thereof; switching means responsive to a control signal for causing the feed pump means for the liquid to be stopped, and control means for producing the control signal for the switching means, said control means comprising impedance means which includes the resistance of the said at least one resistor means, whereby the said resistance being varied by the presence or absence of the liquid in the vat at the level thereof causes the control means to operate the switching means thereby to stop or restart the feed pump means.

REFERENCES:
patent: 1346898 (1920-07-01), Kingsbury
patent: 2924234 (1960-02-01), Wilson
patent: 3279379 (1966-10-01), Klyce
patent: 3292547 (1966-12-01), Ward
patent: 3477460 (1969-11-01), Dotto
patent: 3502899 (1970-03-01), Jones
patent: 3509825 (1970-05-01), Sorensen
patent: 3540027 (1970-11-01), Rauth et al.
patent: 3671142 (1972-06-01), Calabrese
patent: 3800205 (1974-03-01), Zalar

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