Patent ID: 6907790

Claim:
A pressure measurement device, comprising: an inlet couplable to a pressurized process fluid; an absolute pressure sensor coupled to the inlet and providing a process sensor output representing absolute pressure of the process fluid; a field wiring compartment with an electrical connector couplable to a control system; a bus coupled to the electrical connector and providing serial communication and energization to the pressure measurement device; an atmospheric pressure sensor module connected to the bus at the electrical connector, the bus providing the energization to the atmospheric pressure sensor module and the bus receiving a serial communication signal from the atmospheric pressure sensor module, the serial communication signal including numeric data representing atmospheric pressure; and a circuit coupled to the bus at the electrical connector and receiving the process sensor output and receiving the serial communication signal from the bus, the circuit providing a gage pressure output couplable to the control system as a calculated difference between the sensed absolute pressure and the received numeric data.