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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 means:
A SIL1-rated actuator should have a failure probability of ≤10^-6 to <10^-5 during continuous operation per hour.
SIL2 is ≥10^-7 to <10^-6. SIL3 is ≥10^-8 to <10^-7.
Of course, the requirements for products at SIL3 level are significantly higher than those at SIL2.
Most products currently meet requirements with SIL 2 or SIL 3 certification levels.

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 Functional Safety Certification is applicable to all equipment used for implementing process control safety functions, mainly divided into electrical components and safety systems categories.
1. Electrical Components: Actuators, solenoid valves, field sensors, pressure transmitters, temperature transmitters, level transmitters, level switches, programmable controllers, logic solvers, field safety actuators (pneumatic/liquid-powered/electric), safety switches, safety valves, gate valves, solenoid valves, safety interlocks, etc.
2. Safety Systems: SIS (Safety Instrumented System), ESD (Emergency Stop System), Instrument Protection System (IPS), Burn Management System (BMS), F&G (Fire and Gas Protection System), HIPPS (High-Pressure Pipeline Protection System), PSD (Process Shutdown System).
3. Other: Electronic/Electrical/Programmable electronic products with safety requirements.

The standard for SIL (Safety Integrity Level) certification primarily includes:
1. IEC61508—Establishes fundamental safety requirements for both the operational and fault prediction capabilities of conventional systems. These requirements encompass general safety management systems, specific product design, and process design that meets safety requirements, aiming to prevent both systematic design failures and random hardware failures.
2. IEC61511 – A functional safety standard specifically for safety instrumented systems in the process industry. It is a domain standard released by the International Electrotechnical Commission (IEC) following the foundational functional safety standard IEC61508. In China, the coordinating standard for IEC61511 is GB/T 21109.
3. ISO 13849-1 – Comprehensive safety assessment from components to the entire system. This standard also provides designers with more quantifiable methods for design implementation.
4. IEC62061 – Standard in the field of electrical systems.
5. IEC61326-3-2—Additional requirements for the electromagnetic compatibility immunity levels of safety-related equipment, including low probability occurrence end conditions at the site.
6. ISO 26262 – Primarily focused on specific electrical components, electronic devices, and programmable electronic devices in the automotive industry, these are specialized parts used exclusively in the automotive sector, aimed at enhancing the functional safety of automotive electronic and electrical products.
SIL certification is a third-party assessment, 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, 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.