Capacitance & Rf Admittance Type Level Transmitter:A capacitance is formed between the probe and the vessel wall. As the level of the measuring medium rises or falls capacitance between the probe and vessel wall changes proportionately. A high frequency sine wave is applied between the probe and tank wall. A change of medium level will induce a change in the current of the applied sine wave. From when the capacitance in the vessel increase, impedance will decrease and current will increase and vice-versa. (Z=Resistance, C=Capacitance, F= Frequency).
Capacitance & RF Admittance Type Level Transmitter: