Fine resolution liquid level detector

Details Fine resolution liquid level detector Fine resolution liquid level detector

1982-03-29

1984-08-21

Yasich, Daniel M.

Measuring and testing

Liquid level or depth gauge

Float

324251, 73DIG3, G01F 2312

Patent

active

044662840

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 spaced apart magnetic field regions 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 aforesaid rough measure.

REFERENCES:
patent: 3419798 (1968-12-01), Walton
patent: 4056979 (1977-11-01), Bongort et al.
patent: 4191951 (1980-03-01), Juzzell
patent: 4361835 (1982-11-01), Nagy

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