| 摘要 |
<p>A capacitive pressure sensor for an industrial process transmitters comprises a housing, a sensing diaphragm, an electrode and a fill fluid. The housing includes an interior cavity and a channel extending from an exterior of the housing to the cavity. The sensing diaphragm is disposed within the interior cavity opposite the electrode. The fill fluid occupies the interior cavity such that a pressure from the channel is conveyed to the sensing diaphragm to adjust a capacitance between the electrode and the sensing diaphragm. The fill fluid has a dielectric constant higher than about 3.5. In various embodiments, the pressure sensor has a diameter less than approximately 3.175 centimeters (~1.25 inches), the electrode has a diameter less than approximately 1 cm (~0.4 inches), the pressure sensor has a capacitance of approximately 5 to approximately 10 pico-farads, and the fill fluid is comprised of hydraulic fluid having a liquid additive.</p> |
