Differential pressure measurement arrangement utilizing dual transmitters

A two-wire transmitter in a process control system for sensing process variables representative of a process, comprising:

• a module housing;
• a pressure sensor coupled to the module housing for sensing a pressure of the process and providing a sensor pressure output;
• a process variable input for receiving a process variable signal from an external process variable sensor located outside of a module housing;
• an analog to digital converter coupled to the pressure sensor providing a digital pressure output representative of the sensor pressure output;
• compensation circuitry in the module housing receiving the digital pressure output and providing a compensated output;
• an electronics housing coupled to the module housing;
• a microprocessor in the electronics housing coupled to the compensation circuitry for receiving the compensated output from the compensation circuitry and the process variable signal and responsively calculating a physical parameter related to the process;
• and
• output circuitry coupled to a two-wire process control loop for receiving the calculated physical parameter from the microprocessor and responsively transmitting the physical parameter on the two-wire process control loop.