Low level indicator

Details Low level indicator Low level indicator

1982-06-07

1984-08-28

Freeh, William L.

Pumps

Condition responsive control of pump drive motor

By control of electric or magnetic drive motor

417 63, 200 83J, 200 83W, F04B 4906, H01H 3534

Patent

active

044681704

ABSTRACT:
A low level indicator and warning device is provided wherein a diaphragm is provided directly in a line for drawing liquid from one container to another. Liquid flowing in the line washes directly across the diaphragm so that it remains clean and thus operative even in the presence of materials which might form a crust on the diaphragm.

REFERENCES:
patent: 974328 (1910-11-01), Aalborg
patent: 2468768 (1949-05-01), Malick
patent: 2719889 (1955-10-01), Miller
patent: 2765743 (1956-10-01), Hollinshead
patent: 2910940 (1959-11-01), Colman et al.
patent: 2953659 (1960-09-01), Edwards
patent: 3448434 (1969-07-01), Nolte, Jr. et al.
patent: 3799702 (1974-03-01), Weishaar
patent: 3842224 (1974-10-01), Weis
patent: 4049935 (1977-09-01), Gruber
patent: 4227862 (1980-10-01), Andrew et al.
patent: 4257748 (1981-03-01), Ives et al.

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