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ANSI/ISA 61511.3-2018 (IEC 61511-3:2016)

Functional Safety û Safety Instrumented Systems for the Process Industry Sector û Part 3: Guidance for the determination of the required safety integrity levels (IEC 61511-3:2016, IDT)

This part of IEC 61511 provides information on:  -the underlying concepts of risk and the relationship of risk to safety integrity (see Clause A.4); -the determination of tolerable risk (see Annex K); -a number of different methods that enable the safety integrity level (SIL) for the safety instrumented functions (SIF) to be determined (see Annexes B through K); -the impact of multiple safety systems on calculations determining the ability to achieve the desired risk reduction (see Annex J).

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The International Society of Automation [isa]

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