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Photoelectric sensor is a type of switch that is turned off and on by the presence or absence of received light. The inherent advantages of such a “non-contact” switch have resulted in widespread application throughout the industrial world.

Its working mechanism is that the photoelectric switch converts the input current into a light signal on the transmitter and emits it, and the receiver detects the target object according to the intensity or presence of the received light. There are DC and AC photoelectric switches.

A photoelectric switch, also called a photoelectric sensor, is a device that detects the presence or absence of an object by measuring changes in light intensity, typically by emitting a light beam and then detecting when that beam is interrupted or reflected by an object; key characteristics include non-contact detection, long sensing distances, high speed response, ability to detect various materials (including transparent ones), and wide application in industrial automation, material handling, and everyday devices like automatic doors and hand-wave faucets.
Key points about sensor switches:

A “sensor switch” is a device that uses a sensor to detect a change in its environment (like movement, light, or temperature) and automatically triggers an action, essentially acting as a switch that turns something on or off based on the detected change; it’s commonly used in lighting systems to turn lights on when someone enters a room and off when they leave, utilizing an occupancy sensor.
Key points about sensor switches:

This article will discuss the general approach to understanding and using these diagrams for safety switch wiring installation.

Elektronikus kapcsolókban, “Sep” áll “Egy pólus,” “Dp” áll “Dupla pólus,” “ST” áll “Egyetlen dobás,” és “DT” áll “Dupla dobás”; alapvetően leírva, hogy hány független áramkört képes ellenőrizni (“pólus”) És hány pozíciót tud váltani között (“dobás”) egyetlen kapcsoló mechanizmuson belül.