Capacitive level sensors usually use radio frequency technology.
It mainly uses the electrical characteristics of capacitors to detect the level of solid particulate materials, conductive liquids and non-conductive liquids and similar materials such as cement in the container.

The clothed or bare electrode (probe) is immersed in the tank as the first conductive part of the capacitor. The metal body of the tank will act as the other conductor.

In non-metallic and plastic tanks, double electrode systems should be used so that the second electrode can act as the other capacitor conductor. The capacitive level sensor measures the change in capacity that occurs as the material in the tank moves (decreases or decreases) along the probe of the sensor. This capacitance value can be used for a linear measurement or to obtain the level information at a certain point as a contact output.

Advantages:

• Withstands high pressure.
• It can withstand high temperatures.
• It can be easily installed.
• It has no moving parts.
• No cleaning is required.
• It is not affected by vibration.
• Unaffected by foam, splashing, and coating of the probe.
• The trigger level can be changed by the user.