Measuring and testing – Liquid level or depth gauge – Float
Patent
1984-08-20
1986-05-20
Frankfort, Charles
Measuring and testing
Liquid level or depth gauge
Float
73DIG3, 324204, 324251, G01F 2338
Patent
active
045892822
ABSTRACT:
A large number of equally spaced Hall-sensors form a column. They are mounted in a tube with a closed bottom. Each sensor is a packaged integrated circuit with a Hall-cell connected to a Schmitt Trigger circuit. An annular float being fitted slidably about the tube carries a compound magnet that generates a pattern of regularly spaced apart magnetic field regions each having the same dimensions and each capable of switching an immediately adjacent Hall-sensor. The Hall-sensors are energized sequentially and one at one time. By counting the number of Hall-sensors scanned, from the beginning end of the column to the first Hall-sensor that is switched, a rough measure of the liquid level is obtained. The magnetic field regions are spaced apart by a distance that is not equal to the Hall-sensor spacing so that the pattern of Hall-sensor output voltages provides a unique vernier measure of the liquid level that is appropriately added to the afore-said rough measure.
REFERENCES:
patent: 3419798 (1968-12-01), Walton
patent: 3646293 (1972-02-01), Howard
patent: 4056979 (1977-11-01), Bongort et al.
patent: 4084436 (1978-04-01), Smitherman
patent: 4361835 (1982-11-01), Nagy
patent: 4466284 (1984-08-01), Dumery
Frankfort Charles
Sprague Electric Company
Will Thomas B.
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