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Installed between the measuring instrument and the process. Isolates the instrument from corrosive, toxic or plugging effects of the process. Operation is based on Pascal’s Law; force applied to a liquid in a confined area is transmitted undiminished throughout the liquid. Designed so that process pressure exerts a force on the diaphragm, which is transferred via the fill liquid to the measuring instrument

Type of fill liquid used will depend on the particular application. In all cases, the liquid should have a Low freezing point, High boiling point, Low viscosity, Low coefficient of thermal expansion

Siphon

Siphon or pig tail is a type of mechanical seal commonly used.
Used to protect pressure gases from thermal shock in high process temperatures. Steam and other vapors condense and form a liquid trap in the lower portion of the siphon. Usually mounted vertically to prevent thermal shock. When mounted horizontally, siphon will absorb some mechanical shock and vibration

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