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 ...

Compare: NOISE CRITERION, NOISE RATING, SOUND TRANSMISSION CLASS. However, in the situation with face-to-face conversation of non-familiar speech material, the following chart shows the speech ...