/community-hubs/deltav-community-connect/b/safety-weblog/posts/two-solenoid-safety-instrumented-functionsThe practice of process safety has its own language, including concepts such as PFDavg, 1oo2 (one out of two), 2oo2, 2oo3, etc. A whitepaper, Doubling Up On Safety (signup required for download), explores a two-solenoid safety methodology that lets youen-USTelligent Community 13