Measuring and testing – Fluid pressure gauge – Combined
Patent
1985-08-26
1986-04-01
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
Combined
73724, 361283, 137 681, G01L 912, F16K 1740
Patent
active
045790019
ABSTRACT:
A conventional rupturable curved disc in a pressure relief valve for high pressure cylinders serves as one plate of a capacitor. A curved segmented disc, alterable in curvature in response to deformation of the adjacently located curved disc, serves as the other plate of the capacitor. The segmented disc accommodates and conforms to the normal expected deformation of the curved disc, which deformation is due to repeated fill cycles of the cylinder, without altering the maximum and minimum capacitance during each cycle. The segmented disc physically bears against a translatable electrically conductive plunger element. The plunger element is electrically connected to an impedance variation sensing circuit, which circuit senses and provides an output signal responsive to a change in the capacitance between the curved and segmented discs during each cycle; such output signal reflects the actual pressure, and hence state of fill, of the cylinder.
REFERENCES:
patent: 4232698 (1980-11-01), Hosterman
patent: 4408194 (1983-10-01), Thompson
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