According to different photoelectric switch manufacturers, the classification of various photoelectric switches adopts different standards and classification methods, representing different attribute categories. Some of the classification methods between them are cross, and the photoelectric switch will not pass the classification method at the time of purchase. Simplify, integrate and use multiple levels of corresponding options.

　　 1. Classification by detection method

　　 One is the light quantity method. Most photoelectric switches are used to detect whether the object is the light quantity method, whether the light source is shielded or reflected by the object, and the amount of light radiation and shadow changes caused by the object to detect whether there is an object. In addition, photoelectric switch manufacturers have also introduced a triangulation ranging method. The amount of light is easily affected by the flatness, roughness and color of the surface of the object. Therefore, distance detection is required in some demanding occasions. The laser measurement method is that the laser emits a light signal to the target, and then receives the reflected light signal of the target. Photoelectric switch manufacturers say that the distance to the target is calculated by measuring the optical signals before and after.

　　 2. Classification of light source types

　　 According to different photoelectric switch manufacturers, most light sources currently use light-emitting diodes. According to different uses, incandescent lamps (visible light) require white light sign detectors due to their relatively short service life and shock resistance. Light-emitting diode (LED) type (visible light and near-infrared light) is easy to modulate, has long life, small size, and low power consumption. The advantage of earthquake is the ideal light source photoelectric switch. Manufacturers of photoelectric switches indicate that they can be used for various purposes. ) Mainly used for photoelectric systems (image sensors, etc.), ultraviolet (invisible light), visible light (fluorescence finishing defects, foreign objects in food, etc.) to detect objects through ultraviolet radiation. The gas laser (visible light) beam is relatively strong. The photoelectric switch manufacturer's description is used for flaw detection system, bar code system and strong light attenuation occasions, such as steam, flame, etc.

　　The photoelectric switch manufacturer has also corrected some people's mistakes. Some people think that only high-priced products are needed when purchasing photoelectric switches, but in fact, due to differences in adaptation to the space environment, high-priced products cannot fully guarantee the applicability, so they can choose arbitrarily based on the basic principles, component structure and working range of photoelectric switches. After the installation is completed, the state of the photoelectric switch is judged by tracking measurement.