Measuring and testing – Fluid pressure gauge – Vibration type
Patent
1978-10-25
1980-09-09
Ruehl, Charles A.
Measuring and testing
Fluid pressure gauge
Vibration type
73DIG1, 73141R, G01L 110, G01L 1306
Patent
active
042211336
ABSTRACT:
A pressure measuring instrument of the vibrating-wire type comprising an elongate base on which is pivotally mounted an elongate lever parallel to the base. A vibratory wire in the form of a very thin flat ribbon of tungsten is held tautly between the lever and the base. A pair of bellows are supported on the base, on opposite sides of the pivot mounting for the lever, and apply a torque to the lever proportional to differential pressure. Counterbalance means are provided to prevent errors with changes in spatial orientation of the instrument. The lever support-structure is formed of a composite of elements providing a match of temperature expansion characteristics with the vibratory wire. An overrange protection mechanism prevents the application of excessive force to the wire.
REFERENCES:
patent: 2689943 (1954-09-01), Rieber
patent: 3358502 (1967-12-01), Johnson
patent: 3393565 (1968-07-01), Klee
patent: 3701392 (1972-10-01), Wirth et al.
patent: 3771346 (1973-11-01), Huslin, Jr.
patent: 4149422 (1979-04-01), Olsen et al.
Nudd, Jr. Howard W.
Olsen Everett O.
Ruehl Charles A.
The Foxboro Company
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