Capacitive liquid level gauges measure the level of liquid level by measuring changes in capacitance.
It is a metal rod inserted into a liquid container. The metal rod serves as one pole of the capacitor, and the container wall serves as the other pole of the capacitor. The medium between the two electrodes is the liquid and the gas above it. Since the dielectric constant ε1 of the liquid is different from the dielectric constant ε2 on the liquid surface, such as: ε1gt; ε2, when the liquid level rises, the total dielectric constant value between the two electrodes of the capacitive level meter increases. Therefore the capacitance increases. On the contrary, when the liquid level drops, the ε value decreases and the capacitance also decreases. Therefore, the capacitive level gauge can measure the level of the liquid through the change in capacitance between the two electrodes. The sensitivity of the capacitance level meter mainly depends on the difference between the two dielectric constants. Moreover, only constant ε1 and ε2 can ensure accurate liquid level measurement. Because the measured medium is conductive, the metal rod electrodes are covered with an insulating layer. . The capacitive level gauge is small in size, easy to achieve remote transmission and adjustment, and is suitable for liquid level measurement of corrosive and high-pressure media.