Patent ID: 6843133
Filing Date: 2005-01-18
Classification: G01L

Abstract:
1. A capacitive pressure transmitter comprising: a capacitive pressure sensor having a first and second sensor inlets, wherein each inlet is fluidically coupled to a side of a conductive deflectable measuring diaphragm; a self-contained isolator having a process fluid inlet, and an isolator fluid outlet operably coupled to the first sensor inlet, the self-contained isolator also having an isolator diaphragm disposed to fluidically isolate the process fluid inlet from the isolator fluid outlet while providing a pressure at the isolator fluid outlet related to a pressure at the process fluid inlet; a second transmitter inlet operably coupled to the second sensor inlet; sensor circuitry coupled to the capacitive pressure sensor to generate a sensor signal based upon the capacitance of the capacitive pressure sensor; and transmitter circuitry coupled to the sensor circuitry to transmit information relative to the sensor signal over a process communication loop.