Fluid pressure transducer and pressure measuring instrument incl

Details Fluid pressure transducer and pressure measuring instrument incl Fluid pressure transducer and pressure measuring instrument incl

1977-06-28

1978-09-19

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

G01L 706, G01L 710

Patent

active

041144589

ABSTRACT:
A fluid pressure transducer has a sealed capsule with a thin bellows wall of flexible plastics material and rigid end walls attached to a support and to an indicator respectively, so that longitudinal expansion and contraction of the capsule due to variation of the pressure of the fluid in which the capsule is immersed give an indication of this pressure. The capsule contains a gas which imparts an effective elasticity to the capsule, the elasticity of the bellows wall itself being negligible, so that the length of the capsule is to a close approximation inversely proportional to the applied pressure. For direct pressure measurement the floating end of the capsule may carry an indicator which is visible through a wall of a rigid capsule-enclosing casing to which the pressure to be measured is applied. An instrument for use as a depth gauge may incorporate the transducer, which for this application may include a calibrated flow restrictor through which fluid pressure is applied to the capsule, such that the consequent delay in the depth reading provided by the transducer indicates to a diver the length of successive decompression stops during an ascent from depth.

REFERENCES:
patent: 2689481 (1954-09-01), Quiat
patent: 2770134 (1956-11-01), Galperin
patent: 3777573 (1973-12-01), Alinari
patent: 3908461 (1975-09-01), Turpen

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