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IEC 61511-3 Ed. 1.0 b:2004

Functional safety - Safety instrumented systems for the process industry sector - Part 3: Guidance for the determination of the required safety integrity levels

provides information on the underlying concepts of risk, the relationship of risk to safety integrity, the determination of tolerable risk, a number of different methods that enable the safety integrity levels for the safety instrumented functions to be determined,

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International Electrotechnical Commission [iec]
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