Sensor and the wall of the vessel form two electrodes of the electric capacitor. The change in the capacitance of the capacitor, caused by the change in the level in the vessel, is converted by the built-in electronics into the corresponding output signal. Capacitive level switches can be rod or cable version, they do not require special installation conditions and can be used in different industries.
Options and specifications are given in the product catalog, which you can download at the bottom of this page.