Nazim Nazir et al. 2026. Modernizing Legacy Safety Instrumented Systems: A SIL 2 Predictive Gas Detection Framework for Global IEC 61511 Compliance and Industrial Risk Reduction. International Journal of Computer Information Systems and Industrial Management Applications. 18, 23s (Sep. 2026), 1088–1117. DOI:https://doi.org/10.70917/ijcisim-2026-5682.