Level sensing system

Measuring and testing – Liquid level or depth gauge – Float

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Details

73DIG5, 200 84C, 340624, G01F 2312

Patent

active

047964731

ABSTRACT:
Disclosed is a system for sensing the level of a body of liquid within a container. The system includes a shaft secured parallel to a vertical axis of said container, said shaft having a magnetically responsive digital switch. Further provided is a toroidally-shaped reference element situated circumferentially about the shaft and secured at fixed level thereto, the reference element having a magnetic axis which is co-directional with the axis of the shaft. Also provided is a toroidally-shaped measuring sensing element also situated circumferentially about said shaft and vertically above said reference element but without securement thereto, said sensing element having a magnetic axis co-directional with the axis of said shaft and having a polarity of the magnetic axis which is repulsive in relationship to the magnetic axis of the reference element. The measuring element may possess a circumferential interior formed of a material having a negative buoyancy relative to the specific gravity of the level of the liquid to be measured. The reference and sensing elements will repel each other as long as they are within the magnetic proximity of each other, thusly causing the sensing element to float above the level of the reference element. The relative buoyancy of said sensing element will increase as a function of the level of the body of liquid of said sensing element, thereby causing the distance between said sensing and reference elements to change relative to changes in the level of the body of liquid, which changes are monitored by the magnetic actuation of the digital switches.

REFERENCES:
patent: 3242474 (1966-03-01), Gast et al.
patent: 4361835 (1982-11-01), Nagy
patent: 4627283 (1986-12-01), Nishida et al.

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