Note the use of photoelectric switch

Photoelectric switches can be used in various applications. In addition, when using the photoelectric switch, you should also pay attention to environmental conditions, so that the photoelectric switch can work normally and reliably.

　　 Strong light source: The photoelectric switch can generally work stably when the ambient illuminance is high. However, it should be avoided that the optical axis of the sensor faces strong light sources such as sunlight and incandescent lamps. When the angle between the optical axis of the sensor (receiver) and the strong light source cannot be changed, a light-shielding plate or a long light-shielding tube can be installed around the sensor.

　　 Mutual interference: MGK series of new photoelectric switches usually have the function of automatically preventing mutual interference, so there is no need to worry about mutual interference. However, when several groups of HGK series through-beam infrared photoelectric switches are installed in parallel and close to each other, they should prevent adjacent groups and mutual interference. The most effective way to prevent this kind of interference is to set the emitter and the receiver crosswise, and open the group distance when more than 2 groups. Different frequency models can also be used.

　　 HGK series reflective photoelectric switch is an effective way to prevent mutual interference is to open the gap. And the farther the detection distance is, the larger the interval should be, and the specific interval should be determined according to the debugging situation. Of course, models with different operating frequencies can also be used.

Mirror angle: When the measured object is shiny or encounters a smooth metal surface, the reflectivity is generally very high, which is similar to a mirror surface. At this time, the projector and the detected object should be installed at an angle of 10-20° to make The optical axis is not perpendicular to the detected object, thereby preventing malfunction.

　　Background object: When using a reflective diffuser, sometimes the detected object is close to the background object, the photoelectric switch or the background is smooth and other objects with high reflectivity, which may make the photoelectric switch unable to detect stably. Therefore, you can switch to a distance-limited projector and receiver, or use methods such as staying away from the background object, removing the background object, painting the background object in matte black, or trying to make the background object rough and dark.

　　 Self-diagnosis: During installation or use, there may be problems such as slight deviation of the optical axis, lens contamination, dust accumulation, external noise, and ambient temperature out of range due to the influence of the table or background and the vibration of the use. These problems may cause the photoelectric switch to deviate from the stable working area. At this time, the self-diagnosis function of the photoelectric switch can be used to notify the user through the STABLITY green stability indicator to remind the user to adjust it in time.

　　Impact of the table surface: As shown in the figure, when the projector and the light receiver are installed close to the table surface, part of the light beam reflected by the table surface may illuminate the light receiver and cause unstable operation. For this, the light receiver and the projector can be separated from the table by a certain distance and the light shielding plate can be installed.