Patent ID: 7819014

Claim:
A capacitive gage pressure transmitter, the transmitter comprising: a capacitive gage pressure sensor including: a sensor body defining a main chamber therein; a thin ring diaphragm disposed in the main chamber and dividing the main chamber into first and second portions, the second portion being under vacuum and forming a vacuum dielectric; an atmospheric reference port formed in the sensor body and maintaining the first portion of the chamber at an ambient atmospheric pressure; a process media inlet port configured to couple to a source of process media; a conductive deflectable diaphragm disposed between the second portion of the chamber and the process media inlet port; and at least one capacitive plate disposed in the second portion of the chamber relative to the diaphragm such that deflection of the conductive deflectable diaphragm generates a change in capacitance between the at least one capacitive plate and the conductive deflectable diaphragm, the capacitance being indicative of gage pressure of the process media.