Measuring and testing – Fluid pressure gauge – Bourdon
Patent
1981-02-09
1983-02-22
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Bourdon
73742, G01L 704
Patent
active
043744753
ABSTRACT:
A differential pressure gauge of the type comprising a controlling magnetic helix device carrying a pressure indicating pointer, the position of which is controlled by a magnet magnetically coupled to same and mounted on the free end of a helically coiled bourdon tube exposed to differential pressures within the gauge and anchored in the gauge housing at its other end for this purpose. The magnet has a planar pole face paralleling the axis of the helix and defines a magnetic axis that is normal to and intersects the helix axis. The gauge housing defines an integral one piece pressure wall that separates and physically seals the helix from the magnet and bourdon tube and defines within the gauge housing pressure cavity an operating space within which the magnet and its supporting bourdon tube are mounted and operate. Between the helix and the magnet the pressure wall is of film dimensions to allow close placement of the magnet and helix relative to each other, and for defining a magnetic flux passing "window"; the pressure wall is contoured to stress in bending. The bourdon tube is mounted on a mounting plate or crossmember disposed within the pressure cavity, and the mounting plate is arranged for calibrating the gauge by adjustment of the mounting plate, the bourdon tube it carries, and the magnet, as a unit, toward and away from the helix. The gauge includes a zero datum and a device for setting the indicating pointer on the zero datum from exteriorly of the gauge, including an adjustment mechanism coupled to the helix and seated on the housing in alignment with the helix axis.
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patent: 4043197 (1977-08-01), Mounteer et al.
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Dwyer Instruments, Inc.
Woodiel Donald O.
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