Liquid level detector which overcomes hysterisis in the detector

Details Liquid level detector which overcomes hysterisis in the detector Liquid level detector which overcomes hysterisis in the detector

1991-04-15

1993-06-15

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340618, 73308, G08B 2100

Patent

active

052203107

ABSTRACT:
A liquid level detector in which a float is operatively connected to the core of a linear variable displacement transformer. Output signals from the transformer are amplified, sampled, and averaged to obtain an indication of changes in liquid level. As an important feature of the invention, a cyclic disturbance mechanism is oriented to jostle or disturb the float or a motion-transmitting member connected to the float. The jostling force frees the float from frictional forces that would otherwise tend to prevent the float from reaching a true equilibrium position relative to the liquid surface. The float tends to continuously cycle back and forth, hunting a true equilibrium position. By sampling the float position a large number of times, such as one hundred times, an averaged signal representing the true equilibrium position of the float is obtained.

REFERENCES:
patent: 4625284 (1986-11-01), Suzuki
patent: 4771804 (1988-09-01), Morales
patent: 4821022 (1989-04-01), Jannotta

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