Title:
METHOD OF AND APPARATUS FOR MAINTAINING OVER RANGE PRESSURE OF CONVERTER FOR DIFFERENTIAL TRANSMISSION
Document Type and Number:
Japanese Patent JPS54138965
Kind Code:
A
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.
Inventors:
FUREDERITSUKU DEII EZEKIIRU
Application Number:
JP4024879A
Publication Date:
October 27, 1979
Filing Date:
April 03, 1979
Export Citation:
Assignee:
FOXBORO CO
International Classes:
G01L13/02; G01L19/06; F15B5/00; (IPC1-7): F15B5/00
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