NIVELCO capacitance level gauge (capacitance level gauge) is a measuring instrument that uses changes in capacitance to measure the level of dielectric materials in containers. It can directly output 4-20mA current signals. It is a two-wire level transmitter mainly used for measuring the level of conductive or non-conductive liquids and solids in containers. The electrode of the capacitive level gauge and the container wall made of conductive material inside the container form a capacitor. For a given electrode, when the dielectric constant of the measured medium remains constant, a fixed frequency measurement voltage is applied to the electrode, and the current flowing through the capacitor depends on the height of the dielectric between the capacitor electrodes and is proportional to it. Therefore