Liquid level responsive proximity switch

Details Liquid level responsive proximity switch Liquid level responsive proximity switch

1976-09-17

1981-07-14

Smith, Jr., David

Electricity: circuit makers and breakers

Float

Float and pressure

200 84C, H01H 3518

Patent

active

042788587

ABSTRACT:
A liquid level responsive proximity switch for submersible sump and sewage pumps in which a magnetic float, normally buoyed on mercury or other conductive liquid, is submerged by a movable magnetic actuator to displace the mercury into contact with a pair of switch electrodes. The mercury, magnetic float and electrode assembly are housed in permanently sealed casing having a downwardly opened chamber for the actuator under the magnetic float.

REFERENCES:
patent: 1010620 (1905-01-01), Crumpton
patent: 2147506 (1939-02-01), Stoner
patent: 2495149 (1950-01-01), Taylor
patent: 2564655 (1951-08-01), Binford
patent: 2752461 (1956-06-01), Euler
patent: 3673524 (1972-06-01), Lowry
patent: 3904999 (1975-09-01), Rich et al.

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