Pressure-sensor apparatus

A pressure-sensing module, comprising:

• a housing including a process-fluid port configured to be coupled to a process-fluid-flow circuit, the housing defining a first chamber into which the process fluid can flow through the process-fluid port;
• an isolator assembly disposed within the housing and including a fill port, the isolator assembly configured to define a second chamber into which pressure-coupling fluid may be injected through the fill port;
• an electronic circuit disposed within the second chamber and configured to be pressure coupled by the coupling fluid and isolator assembly to the flow circuit, the electronic circuit further configured to produce at least one electrical signal proportional to a magnitude of the pressure of the flow circuit;
• and
• a plug having first and second ends and occupying the fill port thereby sealing the second chamber, the first end being exposed to the process fluid in the first chamber, the second end being exposed to the coupling fluid in the second chamber.