August 2015

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HP Viewpoint: Must devices be certified for use in safety instrumented systems?

For decades, process industries have used different forms of safety control based on what was available in the market. The simple answer to the question of whether SIS devices need to be certified is, "No," but operators and the industry as a whole continue to ask for certification anyway. Why is this?

Gruhn, P., Rockwell Automation

Process safety is a major concern to anyone working in a process facility. An estimated 25,000 facilities covered by the Occupational Safety and Health Administration (OSHA) Process Safety Management of Highly Hazardous Chemicals regulation will have safety instrumented systems (SIS). For decades, process industries have used different forms of safety control based on what was available in the market. The simple answer to the question of whether SIS devices need to be certified is, “No,” but operators and the industry as a whole continue to ask for certification anyway. Why is this? There are several reasons. There is a growing trend for users to specify that all field devices be

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