Signal Machine SIL Certification Application Guide - Shenzhen ZhongNuo Testing

Offer SIL Certification and SIL Rating Consultancy Services – Shenzhen Zhongnuo Testing Technology Co., Ltd.
SIL 2 and SIL 3 certifications are two different levels. According to international certification standards, the SIL 3 level is higher than the SIL 2 level. Specifically, this is manifested as:
A SIL1-rated actuator should have a failure probability of ≤10^-6 to <10^-5 during continuous operation per hour.
SIL2 ranges from ≥10^-7 to <10^-6. SIL3 is from ≥10^-8 to <10^-7.
Of course, the requirements for a SIL3 rating are significantly higher than those for a SIL2.
Most products currently meet the requirements with SIL 2 or SIL 3 certification levels.

What two main aspects does the SIL certification primarily examine?
The product itself, as well as the conformity of the hardware and software functionalities 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 of our evaluation is the quality management system used during the development process, the qualifications of the R&D staff, and the organizational structure, ensuring that the methods and document systems followed throughout the product development process meet relevant standards.
Through these two aspects of evaluation, we can state 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 the reliable and safe realization of product safety functions.

Safety Integrity Level (SIL), abbreviated as SIL, is differentiated by the probability of hazardous failure occurring per hour.
There are four SIL levels defined in the international IEC standards, with SIL 4 indicating high integrity and SIL 1 representing low. Each safety integrity level corresponds to design specifications that can reduce design errors.
The safety level required in the production process is assessed and determined by a specialized production technology company. Generally, processes with high safety requirements need a safety level of SIL3.

As the recognition of industrial accidents and their impact on society becomes widespread, more and more companies are realizing the importance of safety.
In modern process industries, due to the complexity of processes and the multitude of equipment, any failure can have severe consequences for employees, the public, equipment, or the environment.
The SIL certification process involves helping companies fully leverage their good engineering practices and safety technologies (IEC 61508 and IEC 61511) to prevent the recurrence of industrial accidents. This is because these experiences and technologies are based on extensive 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 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, encompassing both product and system levels, with SIL4 being the most stringent.