One of the main intentions for the development of capacitive sensors was basically to obtain device solutions that can be handled in applications similar to inductive sensors, but are also able to detect non-metallic materials such as wood, plastic and also liquids without contact. Capacitive sensors are mainly used for presence control or position detection of objects. In addition, such sensors can be used for filling level control, whereby this is also possible through container walls (more on this topic on page 6).
Capacitive sensors are wear-free, do not require maintenance and have a service life that is independent of the switching frequency. They do not require any actuating force and operate without
contact and do not exhibit contact bounce due to their electronic design. Such devices can be used to directly control electronic circuits as well as PLCs, relays and contactors.
You can find the complete report in the PDF file below.