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Safety Instrumented Function (SIF)

A combination of sensors, logic solver and final elements with a specified safety integrity level that detects an out-of-limit (abnormal) condition and brings the process to a functionally safe state without human intervention, or by initiating a trained operator response to an alarm. The SIF:

  • protects against a specific hazard,
  • performs a specific safety function,
  • has a range of probability of failure on demand (PFD) related to the SIL,
  • is independent from other protection or mitigation systems.

Reference: Layer Of Protection Analysis - Simplified Process Risk Assessement, 2001, CCPS, ISBN 0-8168-0811-7


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