Method and apparatus for overrange protection of the transducer

Details Method and apparatus for overrange protection of the transducer Method and apparatus for overrange protection of the transducer

1978-04-03

1979-01-23

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

73706, G01L 900

Patent

active

041354079

ABSTRACT:
A method and apparatus for protecting the transducer in a liquid-filled differential pressure transmitter having stroke limited, isolation diaphragms from exposure to overrange pressure are disclosed. Bidirectional overrange pressure protection is provided through the use of a single, preloaded bellows that is restrained by a preloaded stop means preferably including a preloaded mechanical spring. The bellows remains stationary when the differential pressure transmitter is exposed to a normal, operational differential pressure. When an overrange pressure is applied to the transmitter, the bellows expands or contracts to accommodate the liquid displaced by either of the isolation diaphragms thereby protecting the transducer from the overrange pressure. Upon removal of the overrange pressure condition, the protection apparatus automatically resets itself.

REFERENCES:
patent: 3058350 (1962-10-01), Brown
patent: 3313158 (1967-04-01), Giovanni
patent: 3756085 (1973-09-01), Hunter
patent: 4028945 (1977-06-01), Bergamini

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