Safety-integrity-level meaning

A measurement of the effectiveness of safety systems based on the probability of tolerable incidents that can occur within a number of processing demands. For example, SIL level 4 means that for every 10,000 demands on the system, there could be one incident. See safety instrumented system. Probability Categories SIL From To 1 1 in 10 1 in 100 2 1 in 100 1 in 1,000 3 1 in 1,000 1 in 10,000 4 1 in 10,000 1 in 100,000
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