Measuring and testing – Speed – velocity – or acceleration – With means for retaining reading
Patent
1975-04-03
1976-07-06
Woodiel, Donald O.
Measuring and testing
Speed, velocity, or acceleration
With means for retaining reading
73205R, 73398R, G01L 708, G01L 910
Patent
active
039675041
ABSTRACT:
A differential pressure transmitter of the sensing diaphragm type is disclosed having low side overrange protection in which the central hub of the sensing diaphragm is releasably biased against the free end of the resilient spring in the transmitter body. A valving mechanism is provided so that under conditions of low side overrange, after the sensing diaphragm has separated from the spring, the valving mechanism provides a chamber of nonresilient body walls behind the sensing diaphragm filled with trapped fill fluid so that the sensing diaphragm is not distorted beyond its elastic limit by the high negative differential pressure.
REFERENCES:
patent: 2977991 (1961-04-01), Bauer
patent: 3289479 (1966-12-01), Tausch
patent: 3841158 (1974-10-01), Hunter
Beckman Instruments Inc.
Harder P. R.
Steinmeyer R. J.
Woodiel Donald O.
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