Ever wondered how to proof test a safety instrumented system? Proof test is a term that was first coined in the original IEC 61511 standard (functional safety – safety instrumented systems for the process industry sector). Unlike regular testing to see if a system performs as required by a specification, a SIF proof test should be

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For the third blog of this series, the focus is on proof testing. This article will look at what proof testing is, why it’s needed, and give some outline examples of proof test procedure requirements.What is “proof testing” and why is it needed?The term “proof testing” was first introduced in the  IEC 61511 [1] standard when

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Operation and maintenance procedures for Safety Instrumented Systems (SIS) will vary from company to company. However, there are some specific requirements that need to be covered for safe continued operation. The first blog on this topic discussed general operation and maintenance (O&M) requirements for sustaining the integrity of a SIS. This second article discusses the requirements

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