Capacitive sensors are used in industrial automation to detect the presence of objects and for the limit level measurement of liquids. They can reliably detect all solids, bulk goods, liquids, metals and non-metals. As they are non-contact, reaction-free and work through container walls, there is no wear.
Sensing range is a distance up to which the sensor can detect the presence of differnt media. We set it with the help of amplification, which depends on the dielectric constant of the media we want to detect. Detection is also possible through non-metals, assuming that the dielectric constant of the media is significantly greater than constant of the material through which the detection is performed.