Why am I not on “the list?”
Tuesday, January 17, 2012Many will agree that exida's Safety Equipment Reliability Handbook (SERH) and the Safety Automation Equipment List (SAEL) are very useful tools for choosing products to use in safety instrumented systems. The SAEL shows a product’s IEC 61508 and cyber security compliance information. In addition, the SERH has a full set of failure rate and failure mode data for each product. However not every product on the market is included. So some may wonder why certain equipment, with published reliability data and/or IEC 61508 certification, is not listed in the SERH and/or SAEL. The reason is simple: the analysis and/or assessment done on the product does not meet exida’s reasonability checks for listing the specific…