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When there is an object moving towards the proximity switch and approaching a certain distance, the displacement sensor only has “perceived†and the switch will act. This distance is usually called the "checkout distance." However, different proximity switches detect different distances.
Sometimes the object to be inspected is moved one by one to the proximity switch and one by one at regular intervals, so that it repeats continuously. Different proximity switches have different response capabilities to the test objects. This response characteristic is called "response frequency".
Precautions:
Eddy current proximity switches and capacitive proximity switches are commonly used in general industrial production sites. Because these two kinds of proximity switches require less environmental conditions.
When the object to be measured is a conductive object or an object that can be fixed on a metal object, an eddy current proximity switch is generally selected because of its high response frequency, good resistance to environmental interference, wide application range, and low price.
If the measured object is non-metal (or metal), liquid level, powder height, plastic, tobacco and so on. Capacitive proximity switches should be used. This switch has a low response frequency but good stability. The environmental factors should be considered when installing.
In the case of better environmental conditions and no dust pollution, photoelectric proximity switches can be used. When the photoelectric proximity switch works, it has almost no effect on the measured object. Therefore, it is widely used in tobacco machinery in demanding fax machines.
In anti-theft systems, automatic doors typically use pyroelectric proximity switches, ultrasonic proximity switches, and microwave proximity switches. Sometimes, in order to improve the reliability of recognition, the above-mentioned types of proximity switches are often used in combination.
No matter which kind of proximity switch is chosen, attention should be paid to the requirements for various indicators such as working voltage, load current, response frequency, and detection distance. 
Talking about the proximity switch
Among various types of switches, there is a component that has "feel" ability to approach its object - a displacement sensor. This is the proximity switch, which uses the proximity sensor's sensitivity to the proximity of the object to achieve the purpose of turning the switch on and off.