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Safety Integrity Level (SIL), also known as SIL, is differentiated by the probability of dangerous failure occurring hourly.
Four SIL levels are defined in the international IEC standards, with SIL 4 indicating high integrity and SIL 1 indicating low. For each safety integrity level, specific design specifications that can reduce design errors are stipulated.
The safety level required in the production process is assessed and determined by a specialized production technology company. Generally, processes with higher safety requirements need a safety level of SIL3.

SIL functional safety certification is one of the important certifications for modern enterprises. In the modern industrial production that relies on machinery and automation, while improving production efficiency, the precision of instruments and equipment often leads to uncontrollable variables and factors in the process of mechanized production. For instance, equipment failures, instrument shorts, and system malfunctions can cause explosions, fires, and toxic gas leaks, posing severe threats to people's lives, property safety, and the environment, and even leading to catastrophic consequences.
How can we control this series of disasters and their consequences to a minimum or within an acceptable range?
Therefore, the SIL certification came into being.
In fact, equipment failures occur at various stages of the product lifecycle, but with varying probabilities. SIL certification involves intervening at the outset of product design, managing the entire lifecycle of the product in accordance with specific standards and mature regulations, thus minimizing the likelihood of failures. This achieves the goal of controlling risks.

SIL certification, also known as functional safety certification, focuses on the safety functions of the product. Obtaining SIL certification is to verify whether these safety functions can be reliably and safely implemented.
For instance, with a lighting fixture, we are concerned with its lighting function, whether its light intensity can reliably and safely meet our requirements.

As the widespread recognition of industrial accidents and their impact on society grows, more and more companies are realizing the importance of safety.
In modern process industries, due to complex processes and numerous equipment, any failure can have severe consequences for employees, the public, equipment, or the environment.
The SIL certification process is about helping companies fully leverage their good engineering practices and safety technologies (IEC61508 and IEC61511) to prevent industrial accidents from recurring. This is because these experiences and technologies are based on a wealth of practical experience and lessons learned.
With the issuance of the IEC 61508 and IEC 61511 series standards, a systematic functional safety assessment and testing process can effectively address this issue.
SIL certification is a third-party evaluation, verification, and certification process based on standards such as IEC 61508 (GB/T 20438), IEC 61511 (GB/T 21109), IEC 61513, IEC 13849-1, IEC 62061, and IEC 61800-5-2, assessing and confirming the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional safety certification primarily involves documentation management (FSM) assessments for the development process of safety equipment, hardware reliability calculations and evaluations, software assessments, environmental testing, and EMC electromagnetic compatibility tests. SIL certification is divided into four levels: SIL1, SIL2, SIL3, and SIL4, encompassing both product and system levels, with SIL4 being the most stringent.