Measuring principle of capacitive level meter

What is the working principle of capacitive level sensor/capacitive level gauge? The principle of capacitive level sensor (capacitive level gauge) is to form a capacitor between the electrode inserted into the silo and the silo wall. When the change of the position causes the change of the capacitance, the corresponding control signal is obtained through the conversion circuit. Because the capacitance changes continuously, the sensor can be used as continuous level measurement, or as a crop level switch as an alarm or input signal for feeding and unloading equipment. The level sensor has the characteristics of low cost, no mechanical wear, and convenient installation and maintenance. The traditional way is to realize the conversion of capacitance to frequency through the frequency modulation oscillator circuit, and then obtain the corresponding voltage or current signal through the amplitude limiting amplification and the linearization of the frequency discriminator. If the electrode (probe) sticks to the material after a period of use, it will often cause the controller to malfunction. Now it has been developed from the traditional detection of capacitance to the method of detection of the admittance between the probe and the warehouse wall. Depending on the size of the range and the different control methods, the electrode is designed as a rod (rod) type, which can be applied to various silos. When installing this type of level sensor, you should pay attention to selecting a suitable installation point and avoid the feeding port; pay attention to the shielding and grounding of the signal line to prevent interference. However, the change of the temperature, humidity, moving speed of the material in the warehouse, and the influence of the material sticking to the warehouse wall and electrodes, etc., cause the change of the dielectric constant of the capacitor. Therefore, if it is used for continuous level detection, its measurement accuracy is not high, and it is usually used as a level switch. Probes and level switches must be regularly checked and calibrated.
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