Patent ID: 7779698

Claim:
A pressure transmitter comprising: a pressure sensor including: a pair of process fluid pressure ports, each port having a deflectable diaphragm adapted for exposure to a process fluid, a first deflectable diaphragm being coupled to a first beam and a second deflectable diaphragm being coupled to a second beam; a crossbeam spanning the first and second beams and having a paddle member depending therefrom the paddle member having a plurality of capacitive plates, each of the capacitive plates forming a part of a different variable capacitor; a first variable capacitor disposed within the pressure sensor, and having a capacitance that varies with differential pressure between the process fluid ports, the first variable capacitor being formed at least in part by one of the plurality of capacitive plates; a second variable capacitor disposed within the pressure sensor, and having a capacitance that varies with line pressure, the second variable capacitor being formed by another of the plurality of capacitive plates; a loop communicator coupleable to a process communication loop and configured to communicate over the loop; a controller coupled to the loop communicator; and measurement circuitry coupled to the controller and to the pressure sensor to provide at least one of an indication of differential pressure and line pressure over the process communication loop.