Expansion chamber for use with a pressure transmitter

A pressure monitoring system (200) provides a pressure sensor (214) and a body that has a first coefficient of thermal expansion and includes at least one opening (226) for accessing a process fluid.At least one isolation diaphragm (230) is coupled to the body and positioned in the at least one opening (226). The at least one isolation diaphragm (230) has a first surface in communication with theprocess fluid. At least one passageway (222) is located in the body and configured to contain a fill fluid in communication with a second surface of the first isolation diaphragm. The at least one passageway (222) is positioned between the first isolation diaphragm (230) and the pressure sensor (214). At least one expansion chamber (242) is coupled to the first passageway and includes an insert (246) having a second coefficient of thermal expansion. The first coefficient of thermal expansion of the body is greater than the second coefficient of thermal expansion of the insert (246).