1OO2One Out of Two (probability)
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References in periodicals archive ?
Traditional redundant systems--whether 1oo2 or 2002--usually have the valves bolted to a backplate and connected together using either stainless steel or hard tubes.
Finally, with most piped 1oo2 or 2002 systems, there is no indication that one of the two valves has failed until or unless both valves fail.
Featuring a 1oo2 safety architecture, the controllers are rated up to Safety Integrity Level 3 (SIL 3).