Area flow meter with hall devices having magnetism-responsive surfaces
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Dec 15, 1994
filing date -
Dec 29, 1993
priority date (Note) -
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Abstract
In an area flow meter, float 22 made of material larger in specific gravity than a fluid being measured is movably disposed in vertical pipe 21. Magnet 23 in the float 22 has its north and south poles aligned vertically to produce magnetic-force lines 26 symmetrically with respect to its symmetry axis. Magnetism-gathering tapered element 27 made of a high-permeability material is configured to flare outwardly from its fixed end to its free end to have their fixed ends mounted on magnetism-responsive surfaces of magnetic sensors 'A' which are at the same distance from the symmetry axis and disposed outside the pipe on a plane perpendicular to the axis. The flux caught by the elements 27 is gathered on the surfaces to boost only output sensitivity required for detection of the float in position.
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