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Diaphragm Seal and Instrument Assembly

Diaphragm Seal and Instrument Assembly

A diaphragm seal’s main purpose is to protect the pressure instrument from the process medium. Diaphragm seals are normally connected directly to the instrument but connection may be made by a capillary. The air space behind the diaphragm membrane and inside the instrument is filled with a fill fluid which acts as a hydraulic medium. When pressure is applied to the diaphragm membrane it is hydraulically transmitted to the instrument’s sensing element by the displaced fill fluid. This allows the instrument to measure the process pressure without making direct contact with the process.

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