Most engineers who design and verify safety instrumented functions (SIFs) understand how hard it is to design a manual proof test with high effectiveness (also called high proof test coverage).
Proof test coverage is an important variable in Safety Instrumented System (SIS) design that can impact risk reduction by an entire SIL level. This is shown in PFDavg calculations.
This webinar will explain proof test coverage, why this is an important safety parameter, and show that the real objective is to detect failures NOT detected by automatic diagnostics. It will also explain how SIS class products will have a lower proof test coverage and why a lower proof test coverage IS NOT a bad thing.