During a functional safety assessment of a packaged equipment manufacturer, the issue of instrumentation equipment qualification came up on the audit checklist. The IEC 61511 standard requires that all equipment used in a safety instrumented function be justified based on having either met requirements of IEC 61508 {IEC 61508 certified) or "prior use" experience.On this project, the equipment justification had not been done. So, we went through the details of the standard. At first, we were focused on the requirements for "prior use" justification.
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