/community-hubs/measurement-instrumentation/b/level-weblog/posts/proof-testing-level-measurement-devices-225063365Safety instrumented systems (SIS) include the sensor(s), final control element(s) and logic solver(s) for each of the safety instrumented functions (SIFs) in the SIS. To verify the SIFs are performing the amount of risk reduction intended for their applicationen-USTelligent Community 13