Transmitter with isolation assembly for pressure sensor

Details Transmitter with isolation assembly for pressure sensor Transmitter with isolation assembly for pressure sensor

1997-03-14

1998-03-24

Dougherty, Elizabeth L.

Measuring and testing

Fluid pressure gauge

With pressure and/or temperature compensation

73706, 73723, G02C 1904

Patent

active

057315221

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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