·Photoelectric switch is the abbreviation of photoelectric proximity switch, which uses the blocking or reflection of light beam by the detected object to connect the circuit by the synchronous loop, thus detecting the presence or absence of the object.

·Objects are not limited to metals, and all objects that can reflect light (or block light) can be detected.

·The photoelectric switch converts the input current into an optical signal at the transmitter and emits it to the receiver, and then detects the target object according to the intensity or absence of the received light.