Transmitter with isolation assembly for pressure sensor
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United States of America Patent
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Mar 24, 1998
Grant Date -
N/A
app pub date -
Mar 14, 1997
filing date -
Mar 14, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A process control transmitter includes a transmitter housing and transmitter circuitry adapted for providing a transmitter output related to a sensed pressure. A sensor coupling in the housing defines a pressure sensor cavity which is filled with isolation fluid. An isolation diaphragm separates the sensor cavity from a process fluid and is adapted to transmit pressure therebetween. The pressure sensor is mounted in the sensor cavity and provides an output related to pressure to the transmitter circuitry. A thermal compensation member is coupled to the sensor cavity and has a thermal expansion coefficient which is different than a thermal expansion coefficient for the sensor coupling. The compensation member is adapted to compensate for pressure changes due to thermal expansion of the components or isolation fluid.
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