Transmitter with isolation assembly for pressure sensor
US5731522A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1997 |
| Grant date | Mar 24, 1998 |
| Priority date | — |
| Expiry date | Mar 14, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L19/0046
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.