Proximity switches are widely used in aviation, aerospace technology and industrial production. In daily life, such as automatic doors of hotels, restaurants, garages, automatic heat fans are used. In terms of security and anti-theft, such as data archives, accounting, finance, museums, vaults, etc., anti-theft devices composed of various proximity switches are usually installed. In the measurement technology, such as the measurement of length and position; in the control technology, such as the measurement and control of displacement, speed, and acceleration, a large number of proximity switches are also used.
Among all types of switches, there is a component that has the ability to "perceive" an object approaching it-a displacement sensor. The purpose of controlling the switch on or off is to use the sensitivity characteristic of the displacement sensor to the approaching object. This is the proximity switch.
When an object moves towards the proximity switch and approaches a certain distance, the displacement sensor will "perceive" and the switch will act. This distance is usually called the "detection distance". But different proximity switches have different detection distances.
Sometimes the objects to be inspected are moved towards the proximity switch one by one and left one by one at a certain time interval, which is repeated continuously. Different proximity switches have different response capabilities to the detection object. This response characteristic is called "response frequency".