Measuring and testing – Fluid pressure gauge – Null balance type
Patent
1979-12-06
1981-05-12
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Null balance type
73708, 73722, G01L 914
Patent
active
042664306
ABSTRACT:
A balance beam has a fulcrum, at least one bellows (connected to the source of pressure or vacuum) acting on the beam at a point along its length and a connection to the armature of a differential transformer at one end. A poise is mounted for movement along the beam by rollers riding on shoulders formed on the beam in a unique arrangement. A carriage having a connection to the poise at the elevation of the axes of the rollers moves the poise and is, in turn, driven by an expansible belt, chain or cable extending around two sprockets, one of which is driven by a servo-motor controlled by a circuit including the differential transformer. Careful provision is made for temperature compensation both longitudinally and transversely of the beam yet the drive elements are elastic. The bellows may be moved to different locations relative to the beam by use of pre-drilled holes in the beam and base plate. Two bellows, on opposite sides of the fulcrum, may be used to gauge pressure differences.
REFERENCES:
patent: 3045489 (1962-07-01), Brandt
patent: 3084551 (1963-04-01), Westman
patent: 3320809 (1967-05-01), Andrae
patent: 3372594 (1968-03-01), Bristol
patent: 3475959 (1969-11-01), Glassey
patent: 3739645 (1973-06-01), Gorgens et al.
Caplan Julian
Fluid Data Systems, Inc.
Woodiel Donald O.
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