Method and apparatus for capacitance temperature compensation and manufacturability in a dual plate capacitive pressure transmitter
US5237285A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 18, 1991 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Oct 18, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A two wire transmitter responsive to a pressure differential sensor includes a fixed module and a removable module. The fixed module is adapted for connection to an analog removable module having a compensation capacitance M.sub.A C.sub.DA or a digital removable module having compensation capacitance C.sub.DD. Capacitance compensation circuitry is included in the fixed module which includes a compensation capacitance C.sub.DM which is selected whereby M.sub.A C.sub.DA equals C.sub.DD when the analog removable module and the digital removable module are calibrated. This provides a pressure transfer function which is more linearized and less susceptible to temperature variations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.