Measuring and testing – Liquid level or depth gauge – Float
Patent
1988-05-12
1990-08-28
Yasich, Daniel M.
Measuring and testing
Liquid level or depth gauge
Float
73DIG5, 73308, 324716, 338 33, 338 43, 338 47, 340686, G01F 0124, G01F 2336, G01N 2700, G01R 3100
Patent
active
049515063
ABSTRACT:
The position sensor of the present invention includes a pair of elongated conducting members disposed in a parallel arrangement and a conducting metallic ball or mercury drop freely movable following the pair of elongated conducting members while maintaining a simultaneous contact with the pair of elongated conducting members, which combination provides two electric circuits respectively including a first circuit including a first poriton of the two elongated conducting members and the contact provided by the metallic ball or mercury drop, and a second electric circuit including the second portion of the two elongated conducting members and the same contact, wherein the metallic ball or mercury drop divides the combination of the two elongated conducting members into the first and second portions. The relative position of the metallic ball or mercury drop under a magnetic force field or the earth's gravitational force field over the length of the two elongated conducting members is determined by comparing the ohmic resistance of the first and second electric circuits, which position so determined is independent of the ohmic resistance of the contact provided by the metallic ball or mercury drop. At least one of two elongated conducting members has a high specific ohmic resistance.
REFERENCES:
patent: 1988192 (1935-01-01), Drabin
patent: 2233572 (1941-03-01), Atkins
patent: 2305973 (1942-12-01), Marchment
patent: 2592929 (1952-04-01), Matchett
patent: 3572122 (1971-03-01), Nusbaum
patent: 3805613 (1974-04-01), Stone
patent: 4796472 (1989-01-01), Lew
patent: 4806915 (1989-02-01), Rasmussen
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