A proximity switch is a position switch that can be operated without the need for direct mechanical contact with moving components. When an object approaches the sensing surface of the switch to the operating distance, no mechanical contact or pressure is required to activate the switch, thereby driving DC appliances or providing control commands to computer (PLC) devices. A proximity switch is a type of switch type sensor (i.e. contactless switch) that combines the characteristics of a travel switch and a microswitch. It also has sensing performance, reliable operation, stable performance, fast frequency response, long application life, strong anti-interference ability, and is waterproof, shockproof, and corrosion-resistant. The products include inductive, capacitive, Hall, AC, and DC types. Proximity switches, also known as contactless proximity switches, are ideal electronic switching sensors. When the metal detection body approaches the sensing area of the switch, the switch can quickly issue electrical commands without contact, pressure, sparks, and accurately reflect the position and travel of the motion mechanism. Even when used for general travel control, its positioning accuracy, operating frequency, service life, convenience of installation and adjustment, and adaptability to harsh environments are incomparable to general mechanical travel switches. It is widely used in industries such as machine tools, metallurgy, chemical industry, light textile, and printing. It can be used as a limiting, counting, positioning control, and automatic protection link in automatic control systems Performance characteristics