Liquid level sensing device

Details Liquid level sensing device Liquid level sensing device

1988-11-10

1989-08-29

Smith, Leonard E.

Pumps

Condition responsive control of pump drive motor

Responsive to accumulation of pumped liquid in receiver

417 44, 200 81H, 200505, 4544, F04B 4902, H01H 3530

Patent

active

048612316

ABSTRACT:
A device for automatically disabling operation of a pneumatic device, such as an air-actuated pump switch. The device includes a diaphragm exposed to atmospheric pressure on one side and to water pressure on the other. So long as the water pressure is high enough, the diaphragm is held in a position in which it seals a pneumatic port and ensures continuing operation of an air-actuated switch. If the water pressure falls below a preselected level, the port is vented to atmosphere and the air-actuated switch is effectively disabled until the water pressure increases again.

REFERENCES:
patent: 3433249 (1969-03-01), Nelson
patent: 3775026 (1973-11-01), Hewlings
patent: 4087204 (1978-05-01), Miedermeyer
patent: 4620835 (1986-11-01), Bell
patent: 4647738 (1987-03-01), Diamoand

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