Feature: Inductive proximity switch is a position switch that can be operated without mechanical direct contact with moving parts. When an object approaches the sensing surface of the switch to the action distance, it can be operated without mechanical contact and any pressure, thus driving DC electrical appliances or providing control instructions to computer (plc) devices. The proximity switch is a kind of on-off sensor (i.e. contactless switch). It has the characteristics of travel switch and micro-switch, as well as sensing performance. It has reliable action, stable performance, fast frequency response, long application life, strong anti-interference ability, and has the characteristics of waterproof, shock proof and corrosion resistance. Proximity switch, also known as contactless proximity switch, is an ideal electronic switch sensor. When the metal detector is close to the sensing area of the switch, the switch can be contactless, pressure-free, spark-free, and quickly send out electrical instructions, accurately reflecting the position and range of the motion mechanism. Compared with general mechanical travel switches, products have many advantages in these aspects, such as general stroke control, positioning accuracy, operating frequency, service life, convenience of installation and adjustment, and adaptability to harsh environment. Products are widely used in machine tools, metallurgy, chemical industry, textile and printing industries. In the automatic control system, it can be used as the link of limit, count, position control and automatic protection. Specification: Model LJ12A3-4-J/EZ Detection distance 4mm ± 10% Set distance 0 -3.6mm Delay distance