Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1981-03-16
1982-11-30
Brigance, Gerald L.
Communications: electrical
Condition responsive indicating system
Specific condition
73313, 338 32H, 340618, G01F 2312
Patent
active
043618359
ABSTRACT:
A liquid level detector "stick" includes a column of Hall-cells adapted to be mounted vertically in a liquid's containing tank. One or more toroidal magnets are slidably fitted about the stick. A float elevates the topmost magnet to the level of liquids in the tank. If the liquids comprise two immiscible parts, a second of the magnets may be floated at the surface of the denser liquid part. A very low power electronic system continuously scans the Hall-cells and determines which particular one or ones of them are adjacent a magnet. This detector may be used in a gasoline station storage tank that may also contain water, providing accurate measure of both liquids. It is also capable of operating in a monitor mode for sounding an alarm when a change in the level of either liquid part occurs that may indicate leakage into or from the tank or an attempted theft.
REFERENCES:
patent: 3484774 (1969-12-01), Borgnakke
patent: 3646293 (1972-02-01), Howard
patent: 3935741 (1976-02-01), Zinsmeyer et al.
patent: 4084436 (1978-04-01), Smitherman
patent: 4124814 (1978-11-01), Lauerman
patent: 4284904 (1981-08-01), Tetro
Gems TLI and How it Works, a publication of Transamerica Delaval, Inc., Gems Sensors Division, Farmington, Connecticut, Copyright 1979, pp. 4, 5 and 6.
Brigance Gerald L.
Sprague Electric Company
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