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Level 2 Light Curtain VS Level 4 Light Curtain: Key Differences in Industrial Safety Protection
Jul 14,2025
In industrial production, safety light curtains, as important safety protection equipment, play a vital role in protecting operators from mechanical injuries. Among them, Type 2 light curtains and Type 4 light curtains are two common types, and there are significant differences between them in many aspects.
1
Production cost
Type 2 light curtains have cost advantages. Their relatively simple hardware configuration, such as a single CPU processor, makes the production and manufacturing costs lower, and the selling price is more affordable.
Type 4 light curtains have significantly higher costs than Type 2 light curtains due to the use of more advanced and complex hardware such as dual CPU processors, as well as higher requirements for manufacturing technology and materials.
2
Product performance
The Type 2 light curtain uses a single CPU processor, which is controlled by a single MCU for output, and usually has a large optical angle. When facing complex environments, its anti-interference ability is relatively weak.
The Type 4 light curtain uses a dual CPU processor, and the dual MCU controls the output simultaneously, with a smaller optical angle. This design makes the Type 4 light curtain perform better in anti-interference ability. In complex industrial environments, such as the presence of a large amount of electromagnetic interference, strong light interference, etc., it can still ensure stable and reliable operation.
3
Self-checking function
The Type 2 light curtain adopts a periodic self-checking method, which means that when a fault occurs, it may cause the safety function to be temporarily lost, but it can be detected in the next self-checking cycle.
The Type 4 light curtain has a powerful self-diagnosis function, which can not only perform fault checks, but also realize high-level redundant fault mutual checks. Even if one of the components fails, it will not cause the loss of the safety function, and the safety function always exists, which greatly improves the safety.
4
Scope of application
Type 2 light curtains are generally suitable for small equipment or equipment with relatively low risk levels. They are commonly used in general automated production equipment, robot workstations, and some material picking and placing devices. The degree of injury that may be caused in these scenarios is relatively moderate or small.
Type 4 light curtains are mainly used in equipment with high risk factors, such as hydraulic presses, punch presses, plate shears and other equipment with large vibrations, as well as high-risk occasions that may lead to serious consequences such as serious personal injury or even death. In these occasions, Type 4 light curtains can provide a higher level of security.
When choosing a safety light curtain, companies need to comprehensively consider cost, performance, equipment risk level, application scenarios and other factors, weigh the pros and cons, and choose the product that best suits their needs, so as to ensure the safety of personnel and stable operation of equipment in the industrial production process. With the continuous improvement of industrial safety standards, Type 4 light curtains will be more widely used in high-risk industries due to their excellent performance advantages, but Type 2 light curtains will continue to play an important role in some low-risk scenarios due to their cost advantages.
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