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Safety Function: The level transmitter will de-energize a safety critical output when exceeding any of the configured alarm limits within the stated accuracy and meet the rigorous, international Safety Integrity Level (SIL) standards. SIL Safe Failure Fraction. Hardware Fault Tolerance*. 0. 1. 2. < 60%. SIL1. SIL2. SIL3. 2. /14. /0. 4. SIL manual. This manual contains the manuscripts of various contributors, PDF probability density function. PFD probability of failure on demand. PDF | The need of reducing costs and shortening development time is resulting in a more and more pervasive use of Commercial-Off-The-Shelf components. RISK REDUCTION | SIL - SAFETY INTEGRITY LEVEL AND FUNCTIONAL SIL 2. SIL 1. SIL 2. SIL 3. SIL 2. SIL 3. SIL 3. SIL 3. SIL 3. SIL 4. SIL 3. SIL 4 b. Understanding Safety Integrity Level (SIL) and It's Effects Table 2. To be considered for a specific SIL level application, a Type A “Simple” device (such as a 16. 1. The Systematic Capability Rating. 2. The Architectural Constraints for the element. 3. The PFDavg calculation for the product. The SIL level of a product is. Safety integrity level (SIL) is defined as a relative level of risk-reduction provided by a safety concept out of context such as, "This is a SIL 3 heat exchanger" or "This software is SIL 2". M.J.M. Houtermans, "SIL and Functional Safety in a Nutshell (Risknowlogy Best Practices Series, 1st Edition, eBook in PDF, ePub, and Safety integrity level (SIL) is defined as a relative level of risk-reduction provided by a safety concept out of context such as, "This is a SIL 3 heat exchanger" or "This software is SIL 2". M.J.M. Houtermans, "SIL and Functional Safety in a Nutshell (Risknowlogy Best Practices Series, 1st Edition, eBook in PDF, ePub, and HFT. SFF. 0. 1. 2. SIL. PL. < 60%. –. SIL 1. SIL 2. 1 b, c. 60% up to < 90%. SIL 1. SIL 2. SIL 3. 2 d. 90% up to < 99%. SIL 2. SIL 3. SIL 4. 3 e. 99% up to > 99%.