Cooling for industrial process variable transmitters

A pressure transmitter assembly for measuring a process pressure of an industrial process, comprising:

• a pressure sensor configured to sense the process pressure;
• a process coupling configured to couple the pressure sensor to the industrial process;
• and
• a thermocouple electric cooling element coupled to the process coupling configured to conduct heat away from the coupling in response to an applied electric signal;
• wherein the process coupling includes an isolation diaphragm coupled to a capillary tube to thereby couple a process pressure applied to the isolation diaphragm to the pressure sensor.

A process coupling for coupling a process variable transmitter to a process fluid of an industrial process comprising:

• an elongate housing having a flange configured to couple the process fluid and an opposed transmitter coupling configured to couple to the process variable transmitter;
• a capillary in the elongate housing which conveys a process pressure at the flange to the transmitter coupling;
• a tube carried by the elongate housing which extends in a direction between the flange and the process variable transmitter coupling;
• and
• a phase change material carried in the tube configured to reduce heat transfer from the industrial process to the process variable transmitter.