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A proximity switch is a device used to detect the approach or departure of an object and is commonly used in automated control systems. It can detect the position, direction, speed and other information of the object, and convert this information into an electrical signal output, which can be used to control the operation of the machine or equipment.

Proximity switches work by using the influence of an object on a magnetic field, electric field, or light to achieve detection. Common proximity switches include magnetic proximity switches, inductive proximity switches and photoelectric proximity switches.
Magnetic proximity switches use the action of magnetic fields, and when the detected object is close to the magnetic proximity switch, the magnetic field changes, resulting in an electrical signal output. The inductive proximity switch uses the induction principle, when the detected object is close to the inductive proximity switch, the induced current changes, resulting in an electrical signal output. The photoelectric proximity switch uses the role of light, when the detected object blocks the light, the photoelectric sensor detects a signal change, thereby generating an electrical signal output.
Proximity switches are widely used in automatic control systems, such as machine tools, automated production lines, conveyor belts, etc. It can improve production efficiency, reduce labor costs, improve safety, etc.

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