Capacitance level switch detects and measure material by capturing change of capacitance value. Ground electrode and detection electrode of the level switch function same as these metal plates. Insulator between the metal plates roles material to measure to detect level. Two concentric tubes acting as electrodes within a tank are coupled to form a capacitor. The amount of energy the capacitor can store, known as the capacitance, is affected by the volume of liquid. As the liquid level fluctuates, so does the amount of stored energy.