Are two safety switches required for PLe / SIL3?

Are two safety switches required for PLe/SIL3? There is a lot of interest in the question whether it is mandatory to use 2 safety switches for PLe applications. Oversizing creates mechanical fault exclusion 1 amGard Pro switch achieves PLe This discussion has been going on for years but has only really come to the attention …

Are two safety switches required for PLe / SIL3? Lees verder »