This type of switch consists of an electronic unit and a sensing probe connected by a co-axial cable. The system consists of oscillators, a detector & an output relay which is controlled by the detector. There are just terminals available for attaching the single cable. The probe also has an active section and a shield section that are isolated from the vessel's ground and one another. The probe for safety purposes does not contain any electronics or other sensing elements. It is used for detecting and measuring material by capturing changes in capacitance value. It is used in various fields in environmental protection, industrial process control, chemicals, and others.