Differential pressure transmitter with highly accurate...

G - Physics – 01 – L

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G01L 19/04 (2006.01) G01L 13/02 (2006.01) G01L 27/00 (2006.01)

Patent

CA 2283284

A remote seal differential pressure transmitter, when installed with its remote seal separated by a vertical distance, has an accurate output signal which is compensated for all temperature effects, including compensation of the sensors' temperature characteristics and compensation of the remote seals' temperature characteristics. Compensation for the remote seals' temperature characteristics must include compensation for the expansion and contraction of the translation fluid used in the remote seals and compensation for changes in density of the translation fluid. The changes in density and the installed height of remote seals specifically create a height/temperature error which must be compensated for when the temperature changes.

L'invention concerne un transmetteur de pression différentielle à joints à distance qui, lorsque ses joints à distance sont séparés par une distance verticale, comporte un signal de sortie précis qui présente une compensation de tous les effets de température, y compris une compensation des caractéristiques de température du détecteur et une compensation des caractéristiques de température des joints à distance. Une compensation des caractéristiques de température des joints à distance doit comprendre une compensation de l'expansion et de la contraction du fluide de translation utilisé dans les joints à distance et une compensation des changements de densité du fluide de translation. Les changements de densité et la hauteur posée des joints à distance créent spécifiquement une erreur de hauteur/température qui doit être compensée lorsqu'il y a modification de température.

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