Safety integrity versus process availability?

摘要

Technical risk management consultant, Risknowlogy has developed a safety system metric that can be used for safety functions and systems that need to comply with IEC 61508, IEC 61511 and related functional safety standards. The new metric, dubbed Spurious Trip Level (STL), can be used by end-users, system integrators and product developers to classify the performance of safety devices, functions and systems. It is particularly important for end-users, as they can measure how much asset protection is achieved with the designed safety system.