Measuring and testing – Fluid pressure gauge – With protective separator
Patent
1979-06-27
1980-08-26
Woodiel, Donald O.
Measuring and testing
Fluid pressure gauge
With protective separator
73716, 73720, G01L 1302
Patent
active
042189250
ABSTRACT:
A differential pressure to electrical signal transmitter has a pair of barrier diaphragms and a pair of nested internal control bellows located between the barrier diaphragms. A first internal volume defined between one barrier diaphragm and a corresponding mating support plate in the transmitter body is pressurized with a first fluid, and a second internal volume defined by the other barrier diaphragm and a respective mating support plate in the transmitter body is pressurized with a second fluid. The first volume is connected by a first fluid of conduit to a first chamber of a differential pressure sensor and is filled with a first incompressible fill fluid. The second volume is connected by a second fluid conduit to a second chamber of the sensor and is filled with a second incompressible fill fluid. The pressures of the two fill fluids act on opposite sides of the differential pressure sensor whereby an electrical output signal is produced dependent on the difference between the fill fluid pressures. The nested bellows are pressurized by the respective fill fluids acting in opposition on each bellows and are used to provide a means for absorbing a fill fluid displaced by a movement of the barrier diaphragm caused by excessive pressure. An overload bottoming of the barrier diaphragm on a mating support plate ultimately isolates the sensor from the overload input pressure and terminates the fill fluid transfer.
REFERENCES:
patent: 3313158 (1967-04-01), Giovanni
patent: 3400588 (1968-09-01), O'Connor
patent: 3712143 (1973-01-01), Weaver et al.
patent: 3756085 (1973-09-01), Hunter
patent: 3841158 (1974-10-01), Hunter
patent: 4028945 (1977-06-01), Bergamini
patent: 4072058 (1978-02-01), Whitehead
patent: 4135407 (1979-01-01), Ezekiel
patent: 4173149 (1979-11-01), Critten
Burton Lockwood D.
Halista Mitchell J.
Honeywell Inc.
Marhoefer Laurence J.
Woodiel Donald O.
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