Liquid level responsive apparatus

Details Liquid level responsive apparatus Liquid level responsive apparatus

1975-08-11

1976-07-20

Queisser, Richard C.

Measuring and testing

Liquid level or depth gauge

Hydrostatic pressure type

G01F 2316

Patent

active

039699420

ABSTRACT:
Liquid level responsive apparatus is provided which includes a tube having a lower terminal end immersed in the liquid in a container uncovered when the liquid level is below the terminal end for discharge of air from the tube, the tube having a small electric motor driven air pump supplying air thereto, the tube having a pressure tap connected to one side of a diaphragm for normally maintaining the diaphragm in one control position, the diaphragm being collapsible to another control position, the tube having a vent of predetermined size for limited venting of air from the tube while the diaphragm is maintained in its one control position. The diaphragm can control a microswitch which in turn can control any desired operation such as shut-off of delivery. A plurality of tubes can be connected in parallel with their terminal ends in different liquid containers.

REFERENCES:
patent: 2581427 (1952-01-01), Matthews
patent: 2658389 (1953-11-01), Eby
patent: 3200971 (1965-08-01), Trethewey
patent: 3467122 (1969-09-01), Jones
patent: 3494191 (1970-02-01), Cawley et al.
patent: 3620085 (1971-11-01), Khoi
patent: 3734313 (1973-05-01), Gauthier et al.
patent: 3780581 (1973-12-01), Acre et al.
patent: 3885435 (1975-05-01), Cascio

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