Choosing Functional Safety Field Instrumentation

USA | Safety instrumentation

Certified, prior use or both? Fundamentals of VDI 2180

Determining the equipment to use in safety instrumented systems (SIS) and the rules for maintaining them is one of the most difficult and controversial topics in the industrial SIS marketplace. Learn more from Siemens industry experts.

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Can you justify using safety certified instrumentation?

There is a lot of confusion around Safety Instrumented Systems (SIS) and the associated protection layers. While some may claim that “IEC 61508 certified equipment” is the way to go, others defend the concept of using field data collection and analysis of previously used general purpose instrumentation as the way to select appropriate instruments.

This presentation addresses both philosophies and presents a simplified way to calculate the performance of a Safety Instrumented Function (SIF).


Key takeaways include:

  • Random vs. systematic failures

  • Proven in-use vs. prior use

  • Certified vs. evidence of suitability

  • Simplified VDI 2180 calculations



Check out Luis Garcia's recorded webinar to learn more