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Safety Integrity Level (SIL), also known as SIL, is distinguished by the probability of hazardous failure occurring per hour.
Four SIL levels are defined in the international IEC standards, with SIL 4 indicating a high level of integrity and SIL 1 representing a low level. Corresponding to each safety integrity level, design specifications that can reduce design errors are stipulated.
The safety levels required in the production process are assessed and determined by specialized process engineering companies. Generally, for processes with higher safety requirements, the required safety level is SIL 3.

What two aspects does the SIL certification mainly examine?
The product itself, as well as the conformity of the hardware and software functions of the intended certified product, to the requirements of IEC61508 or more detailed industry-specific functional safety standards, such as hardware failure rates and failure modes.
Another key focus in our evaluation is the quality management system utilized during the development process, as well as the qualifications of the R&D staff and the organizational structure, ensuring that the methods and document systems followed throughout the product development align with relevant standards and requirements.
Through these two aspects of examination, we can say that from the entire company to the R&D process and finally to the formation of specific certified products, a complete closed loop has been formed, ensuring that the product's safety features can be reliably and safely implemented.

The SIL functional safety certification is one of the important certifications for modern enterprises. In modern industrial production, while machinery instruments enhance production efficiency, due to the complexity of production processes and the precision of equipment, uncontrollable variables and factors are inevitable in the process of mechanized production. For example, equipment failures, instrument short circuits, and system malfunctions can lead to explosions, fires, toxic gas leaks, and other serious hazards to people's lives, property safety, and the environment, even catastrophic consequences.
How can we minimize or control this series of disasters and their consequences within an acceptable range?
Therefore, the SIL certification came into being.
In fact, equipment failures occur at various stages of the product lifecycle, just with varying probabilities. SIL certification involves intervening at the outset of product design, implementing manageable control over the entire product lifecycle according to specific standards and mature regulations, thereby reducing the likelihood of failures. This ultimately aims to control risks.

SIL certification, also known as Functional Safety Certification, focuses on the safety functions of a 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.
SIL certification is a third-party assessment, verification, and certification 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, which evaluate and confirm the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional safety certification primarily involves document management (FSM) assessments for the development process of safety equipment, hardware reliability calculations and evaluations, software assessments, environmental testing, and EMC electromagnetic compatibility testing. SIL certification is divided into four levels: SIL1, SIL2, SIL3, and SIL4, covering both product and system levels, with SIL4 being the most stringent.