Non-contact type liquid level sensor

Details Non-contact type liquid level sensor Non-contact type liquid level sensor

2006-04-04

2006-04-04

Williams, Hezron (Department: 2856)

Measuring and testing

Liquid level or depth gauge

Float

C073S29000R, C073S317000

Reexamination Certificate

active

07021139

ABSTRACT:
A non-contact type liquid level sensor includes a sensor housing; a rotary shaft, rotatably mounted on the sensor housing; a float, vertically movable with a change of a liquid level; a float arm, having a first end mounted on the float, and a second end coupled to the rotary shaft such that the rotary shaft is rotated with a vertical movement of the float; an annular magnet, coupled to the rotary shaft, and rotating together with the rotary shaft; a pair of arcuate stators, disposed in the sensor housing so as to confront an outer peripheral surface of the magnet; and a magnetoelectric transducing element, disposed between the first ends of the stators, for detecting a change of a magnetic flux density in the stators, which is caused by a turn of the magnet, and for converting the detected change of the magnetic flux density into an electrical signal. Second ends of the stators are spaced from each other to form a gap having an opening angle within a range from 50° to 200°.

REFERENCES:
patent: 4986124 (1991-01-01), Byrne et al.
patent: 2004/0016296 (2004-01-01), Weisse
patent: 19751210 (1999-05-01), None
patent: WO 00/52425 (2000-09-01), None
Journal of Technical Disclosure 2001-4678 issued by Japan Institute of Invention and Innovation.

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