There is a lot of confusion around Safety Instrumented Systems (SIS) and the associated protection layers. While some may claim that “IEC 61508 certified equipment” is the way to go, others defend the concept of using field data collection and analysis of previously used general purposes instrumentation as the way to select appropriated instruments.
This white paper addresses the controversy surrounding discussions about determining the equipment to use in safety instrumented systems (SIS) and the rules for maintaining them.