Pressure sensor for a pressure transmitter
US6484585B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 26, 2000 |
| Grant date | Nov 26, 2002 |
| Priority date | — |
| Expiry date | Oct 26, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L19/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pressure transmitter in a process control system for transmitting pressure on a process control loop includes a transmitter housing, an isolation diaphragm configured to couple to a process fluid, and a pressure sensor body of a brittle corrosion resistant material operably coupled to the housing and positioned in the housing. The pressure sensor comprising a first portion bonded to a second portion by a fusion bond, the fusion bond substantially free of foreign material. An isolation fluid is configured to fluidically couple the pressure sensor body to the isolation diaphragm to thereby couple the pressure sensor to a pressure of the process fluid. Measurement circuitry in the transmitter housing coupled to the pressure sensor provides an output which is a function of capacitance, a loop interface in the transmitter housing coupled to the measurement circuitry configured to transmit a pressure related signal on the process control loop as a function of the pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.