Vibration type level detector

Details Vibration type level detector Vibration type level detector

1999-02-16

2000-08-22

Williams, Hezron

Measuring and testing

Liquid level or depth gauge

G01F 2328

Patent

active

061054259

ABSTRACT:
A base of a detection pipe is fixed. A vibration piece has its one end fixed to a closing portion and the other end provided with a permanent magnet. An electromagnet is closely attached inside the detection pipe such that it is arranged in a direction of axis of the permanent magnet, thereby forming a folded cantilever. Vibration is detected by a distortion detecting element, and the output therefrom is amplified by an amplification circuit for driving the electromagnet. Thus, the detection pipe, closing portion and vibration piece are repeatedly vibrated.

REFERENCES:
patent: 3266311 (1966-08-01), Andreasen et al.
patent: 4558588 (1985-12-01), Beaudoin et al.
patent: 4740726 (1988-04-01), Umezawa
patent: 4785663 (1988-11-01), Hermann
patent: 4839590 (1989-06-01), Koski et al.
patent: 5247832 (1993-09-01), Umezawa et al.
patent: 5670709 (1997-09-01), Gallagher

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