/community-hubs/deltav-community-connect/b/safety-weblog/posts/self-contained-hydraulic-emergency-shutdown-systemSergio Vaz Lopes A safety instrumented function (SIF) in a safety instrumented system (SIS) contains a sensor, logic solver and final element. All must function properly in the event of a safety demand to take the process into a safe state in coordinationen-USTelligent Community 13