Elevator light curtain is an important safety equipment in the elevator operation, how to prevent the light curtain interference and affect the safety is an important factor to consider, the interference is divided into light source interference and non-light source interference (such as other electrical appliances such as inverters). In the indoor environment of the light curtain sensor connected to a good shielded wire (light curtain comes with) is able to achieve the effect of anti-interference from other light sources, if not that is the product itself is not pass. For other non-light source interference regular products are completely shielded (except in special circumstances). If there are three reasons for interference: 1, the light curtain sensor itself is not qualified design, 2, used in the outdoors or can be direct sunlight to the place (light curtain sensor is designed in accordance with the indoor environment), 3, other electrical interference is very strong.