Liquid sensor

Details Liquid sensor Liquid sensor

1974-11-25

1977-03-08

Miller, J D

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

337382, 337394, H01H 6102

Patent

active

040115364

ABSTRACT:
A sensor which utilizes the difference in thermal characteristic between two fluids to detect the presence of one fluid or the other. A continuously heated thermal expansion element activates a switch. When the element is brought in thermally conductive contact with a liquid, the heated element drops in temperature, shortening the length of the expansion element and activating the switch.

REFERENCES:
patent: 2761924 (1956-09-01), Keenan
patent: 2782285 (1957-02-01), Cantlin
patent: 3205709 (1965-09-01), Gearing et al.
patent: 3760352 (1973-09-01), Marcoux

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