Differential pressure transducer with strain gauge

Details Differential pressure transducer with strain gauge Differential pressure transducer with strain gauge

1979-08-20

1980-09-09

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

338 4, 7386147, G01L 906, G01F 138

Patent

active

042211344

ABSTRACT:
To provide a low cost electrical readout for differential fluid pressure, a strain gauge, preferably a piezo-resistive semiconductor, is bonded to a flexible strip of metal sandwiched diametrically between a matched pair of diaphragms circumferentially sealed in a fluid-tight cavity, preferably formed by a pair of modified orifice plates. Opposite sides of the diaphragm assembly are in fluid communication via suitable tubing with a fluid restrictive device, formed in one embodiment by a vane-type flowmeter. An inlet and outlet formed in each orifice plate allows shunted fluid to flow across opposite faces of the diaphragm assembly so that the semiconductor strain gauge can be used to sense the temperature of the fluid in the conduit. Replaceable inserts in the face of each orifice plate permit simple alteration of the device to meet desired operational parameters.

REFERENCES:
patent: 2816441 (1957-12-01), Ezekiel
patent: 3343420 (1967-09-01), Kondo et al.
patent: 4161887 (1979-07-01), Stone et al.
patent: 4172388 (1979-10-01), Gabrielson

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