Operating Principle of Capacitance Level Sensors

Capacitance level instruments operate on the basic principle of the variation of the electrical capacity or capacitance of a capacitor formed by the sensor, vessel wall and dielectric material. A capacitor is made up of two conductive plates which are separated from each other by a dielectric. The storage capability of a capacitor defined by the capacitance, C, is directly dependent on the plate areas (A), their distance apart (d) and the dielectric constant of the material between the plates:

C = ЄA/d

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