When the detection switch is inconvenient to approach the detection object or when it is easy to be damaged when it is close to the detected object, when the space is limited, or when the detected object is small (using optical fiber for detection), a photoelectric switch can be used. It does not distinguish between metal and non-metal. It should be noted that whether the switch is determined according to whether the photoelectric switch receives the light source or not. It is divided into light-on type and dark-on type. According to the form of the output circuit, it is also divided into PNP type and NPN type; When the detection switch is easy to approach the object under test and is not easy to be damaged, the inductive type is used to detect metal objects, and the capacitive type is used to detect non-metal objects. According to the form of the output circuit, it is also divided into PNP type and NPN type; some detection switches also Knob to adjust sensitivity. Speaking of photoelectric switches, people will have questions about this, now I will answer them. The so-called photoelectric switch is the meaning of photoelectric sensor, which is the abbreviation of photoelectric proximity switch, which is realized by blocking or reflecting the light beam by the detected object, so it can detect the presence or absence of an object. The photoelectric switch is actually a kind of sensor, and its function is to detect. However, since the output circuit of the photoelectric switch is electrically isolated, it can be used in many occasions. The function of the photoelectric switch has delay, widening, external synchronization, anti-interference, high reliability, and stable working area.
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