The density of the beam determines how well a body part can pass through the light curtain before being detected. According to ergonomic data, the diameter of the fingers of an adult should be no less than 14 mm, the thickness of the palm should be no less than 30 mm, and the diameter of the wrist should be no less than 40 mm. For example, if the distance between the optical axes of the safety light curtain used is 40 mm, the diameter of the optical axis is 20 mm, and the resolution is 4020=60 mm, then fingers, palms, wrists and arms can pass through the light curtain without being detected . Therefore, if we want to achieve higher safety, we need to use higher resolution safety light curtains.

When using light grids and safety light curtains, there are certain requirements for installation. People are not allowed to bypass the grating and light screen to enter the hazardous area, and there is no surface reflection light near the grating and light screen, so the receiver can receive the reflected light and cannot output the safety switch signal. In addition, there are certain requirements for the use environment of gratings and light curtains. If there is too much dust in the environment, it will affect the emission of light, thus affecting the use of light grids and safety light curtains.