Capacitive sensors are also often known as the capacitance meter, capacitance level meter capacitive sensing element is working under the principle of a cylindrical capacitor, the capacitor from the inside of two insulated coaxial cylindrical plate electrode and the outer electrodes, while between the two cylinder filled with a dielectric constant e of the electrolyte, the capacitance between the two cylinders is C = 2ΠeL / lnD / d, where L is the length of the two tubular portions overlap each other; D diameter of the outer cylinder electrode; d is the diameter of the inner cylinder electrode; e is the dielectric constant of an intermediate medium. One of the actual measurement D, d, e are essentially the same, so you can know the level measured at the level of C, which is the capacitive sensor is easy to use, simple structure and high sensitivity, low price and other characteristics of the reasons .

keywords: Sensors, pressure sensors, capacitive pressure sensor,