Measuring and testing – Liquid level or depth gauge – Float
Patent
1993-04-12
1994-09-20
Gutierrez, Diego F. F.
Measuring and testing
Liquid level or depth gauge
Float
73319, 73311, 73DIG5, 73291, 200 84C, 335206, 335207, 377 21, 377 54, G01F 2362, G01F 2372, H01H 3518
Patent
active
053478649
ABSTRACT:
An improved liquid level measuring apparatus having a plurality of spaced reed switches having a microprocessor attached to the liquid level measuring sensor apparatus. The switches are wired together in parallel and in sets and are addressed by a shift register for providing a parallel to serial shift of the switch status position to the microprocessor. This allows a reduction in the number of conductors existing the sensor and providing an output signal indicating the vertical position of a float relative to the switches. A microprocessor control notes any inoperative switches, disregards the reading of the inoperative switches in calculating liquid level, and provides stored information to the measurement process for compensating for defective switches.
REFERENCES:
patent: 3050714 (1962-08-01), Campbell, Jr.
patent: 4839909 (1989-06-01), Warner
patent: 4976146 (1990-12-01), Senghaas et al.
Kolonko, Jr. Pete T.
Michalec Jerzy
Senghaas Karl A.
Senghaas Peter
Wang Jing
Electrolab, Inc.
Gutierrez Diego F. F.
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