Capacitance Level Sensor

A capacitance is formed between the probe and the vessel wall.As the level of the measuring medium rises or falls capacitancebetween the probe and vessel wall changes proportionately. Ahigh frequency sine wave is applied between the probe andtank wall. A change of medium level will induce a change in thecurrent of the applied sine wave. From when thecapacitance in the vessel increase, impedance will decreaseand current will increase and vice-versa. (Z=Resistance,C=Capacitance, F= Frequency)