SCADA / Process Safety

SIL Verification Calculator

Verify Safety Instrumented Function (SIF) loop PFDavg, achieved SIL level, architecture constraints, and proof-test interval recommendations per IEC 61511-1 §6.3 and IEC 62061.

Presets

Sensor / Transmitter

SIL (Target)

Voting Architecture

Proof Test Interval

Proof Test Interval (hours) Hours between proof tests. 8760 h = annual testing.

Common Cause Failure (β)

β-Factor (common cause)

IEC 62061 §6.7.3: typically 2–10%, default 5%

Architecture Constraints

Sensor HFT Leave blank to use default failure rates (λ_DU=1×10⁻⁷, MTTF=87600 h)

Sensor SFF (%) IEC 62061 §6.7.3: typically 2–10%, default 5%

Verify Safety Instrumented Function (SIF) loop PFDavg, achieved SIL level, architecture constraints, and proof-test interval recommendations per IEC 61511-1 §6.3 and IEC 62061.