/community-hubs/deltav-community-connect/b/safety-weblog/posts/streamlining-proof-testing-procedures-1931501088Click to enlarge Safety instrumented systems (SISs) require periodic proof testing of all of their safety instrumented functions (safety loops) which include the sensor, logic solver, and final element. An out-of-the-box proof testing solution fromen-USTelligent Community 13