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Manufacturers of safety related equipment compliant with BS EN
61508:2010 perform analysis of their equipment to determine the:
failure modes;
estimated dangerous detected and undetected failure rates;
diagnostic coverage;
environmental limits;
estimated equipment lifetime;
periodic proof test and
maintenance requirements.
This information should be provided in the safety manual and include
any specific requirements for proof testing of the equipment.
Vendor data therefore provides the undetected dangerous failure rate,
specific proof test requirements and the percentage coverage these
requirements are estimated to provide.
Introduction