Patent ID: 8887575

Claim:
A capacitive manometer assembly comprising: a diaphragm including a conductive material; an electrode structure including an inner electrode and an outer electrode, wherein the inner electrode and outer electrode are separated from one another, wherein the diaphragm is movable relative to the electrode structure between (i) a zero position when the pressure on each side of the diaphragm is the same and (ii) a maximum differential position when the maximum measurable differential pressure is applied to the diaphragm; a support structure arranged so as to support the diaphragm so that the diaphragm is constrained relative to the electrode structure, and the diaphragm is spaced from and axially aligned with the inner and outer electrodes relative to an alignment axis of the manometer; a baffle with one or more apertures configured to admit gas to a region adjacent the diaphragm, wherein the baffle is configured to reduce effects of surface deformation of the diaphragm due to reactive gas.