DIFFERENTIAL PRESSURE TRANSMITTER WITH HIGHLY ACCURATE TEMPERATURE COMPENSATION

摘要

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.