Light curtains are divided into safety light curtains with a safety rating and ordinary light curtains without a safety rating.

Safety light curtains are mainly used in industrial automation.

In modern factories, people and machines work together in some potentially dangerous machinery and equipment, such as stamping machinery, shearing equipment, metal cutting equipment, automated assembly lines, automated welding lines, mechanical transmission and handling equipment, and hazardous areas (toxic, high-pressure, high-temperature, etc.), which are prone to cause personal injuries to the operating personnel.

The photoelectric safety device generates a protective light curtain by emitting infrared rays. When the light curtain is blocked, the device sends out a blocking signal to control the potentially dangerous machinery and equipment to stop working and avoid safety accidents.

Installation of photoelectric safety protection device can effectively avoid the occurrence of safety accidents, avoid the danger of operating workers and third parties, reduce the comprehensive cost of accidents, in favor of the company itself, operating workers and society.

Safety light curtains are generally categorized into safety level 2 and safety level 4.

Ordinary light curtains that do not have a safety level are generally used in elevators or in the security field to prevent intrusion detection.

When used in the security field to prevent intrusion detection, 3C certification is required.

The most common application of ordinary light curtains without safety level is elevator light curtains.

Design methods to improve the reliability of light curtains.

In actual working conditions, the light curtain damage or instability is often due to unstable voltage, poor grounding, interference with ambient light, dust, water and other reasons.

Therefore, in order to improve the fault-free working time of the light curtain products, it is recommended to consider the following factors when designing the light curtain:

- IP65 protection level

- Ambient light intensity of 100,000 Lux or more

- Fluorescent lamps with a light intensity of 3000 Lux or more

- Metal enclosure, grounding-free design

- Passed a static discharge test of at least 4000V.

- Withstand instantaneous surge of 1000V

- Withstand group pulses of 4000V or more