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Selecting “Sensors” for Safety Instrumented Systems per IEC 61511 (ISA 84.00.01 – 2004)
(PDF 178 KB)

This paper will discuss sensor classifications of “sensors” for SIS applications that meet IEC 61511 (ISA 84.00.01-2004) requirements while minimizing lifecycle costs. The history of SIS standards is discussed followed by a discussion on the iterative process used for selecting sensors for SIS applications. The sensor selection includes an in-depth discussion of the two options, certified and prior-use. The paper then concludes by discussing other considerations when selecting sensors for SIS such as product capabilities and limitations, proof-test, safety accuracy and safety response time.