Patent ID: 7624642

Claim:
A differential pressure transmitter comprising: first and second process fluid inlets; a differential pressure sensor having first and second sensor inlets; a first isolator diaphragm disposed proximate the first process fluid inlet and operably coupled to the first sensor inlet through a first fill fluid volume; a second isolator diaphragm disposed proximate the second process fluid inlet and operably coupled to the second sensor inlet through a second fill fluid volume; transmitter circuitry operably coupled to the differential pressure sensor and configured to measure an electrical parameter of the sensor and provide an indication thereof; a third fluid volume substantially surrounding the differential pressure sensor, the third fluid volume exerting a compressive force on the differential pressure sensor; and first and second secondary isolator diaphragms, wherein the first secondary isolator diaphragm is operably coupled to the first isolator diaphragm and separates the first fill fluid volume from the third fluid volume, and wherein the second secondary isolator diaphragm is operably coupled to the second isolator diaphragm and separates the second fill fluid volume from the third fluid volume.