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What is the difference between SIL2 and SIL3 authentication?

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| 2020-06-22|Return

SIL certificationIt is a third-party evaluation, 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, IEC 61800-5-2, to evaluate and confirm the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment.Functional safety certificationIt mainly involves document management (FSM) evaluation for the development process of security equipment, hardware reliability calculation and evaluation, software evaluation, environmental testing, EMC electromagnetic compatibility testing, and other content.


SIL certification is divided into four levels: SIL1SIL2SIL3 and SIL4, including two levels of product and system. Among them, SIL4 has the highest requirements.

SIL2 and SIL3 certifications are two different levels. According to international certification standards, the SIL3 level is higher than the SIL2 level. Specifically manifested as:

For example, the likelihood of failure of an SIL1 level actuator during continuous operation per hour on average should be controlled between ≥ 10-6 and<10-5. SIL2 is ≥ 10-7 to<10-6. SIL3 ranges from ≥ 10-8 to<10-7.


Of course, the requirements for products at the SIL3 level are much higher than those of SIL2. Currently, most products are SIL2 orSIL3authenticationThe level can meet the requirements.

For more information on SIL certification, please contact Zhongnuo Testing directly

Service hotline: 18924609560 (same WeChat account)

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