Signal Interlock SIL Rating Application Documents - Shenzhen ZhongNuo Inspection

Offer SIL Certification and SIL Rating Consultancy Services — Shenzhen Zhongnuo Testing Technology Co., Ltd.
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 of our examination is the quality management system employed during the development process, the qualifications of the R&D personnel, and the overall organizational structure, ensuring that the methods used and document systems adhered to throughout the product development meet relevant standards.
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 are reliably and safely implemented.

Safety Integrity Level, abbreviated as SIL, is distinguished by the probability of dangerous failure occurring per hour.
There are four SIL ratings specified in the international IEC standards, with SIL 4 indicating high integrity and SIL 1 representing low. For each safety integrity level, specific design specifications are set to reduce design errors.
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 applicable to all equipment used for implementing process control safety functions, mainly categorized into electrical components and safety systems.
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/pneumatic), safety switches, safety valves, cutoff valves, solenoid valves, safety interlocks, etc.
2. Safety Systems: SIS (Safety Instrumented System), ESD (Emergency Shutdown System), Instrument Protection System (IPS), Burner 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.

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're concerned with its lighting function, whether its brightness can reliably and safely meet our requirements.
SIL certification 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, etc., for the Safety Integrity Level (SIL) or Performance Level (PL) of safety equipment. Functional safety certification primarily involves the assessment of document management (FSM) for the development process of safety equipment, hardware reliability calculation and evaluation, software evaluation, 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 having the highest requirements.