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