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Positioners and Partial Stroke Tests in Safety Applications

Posted in Final Control Element, Safety on Wednesday, February 4th, 2009. 8 comments so far
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InTech magazine has a web exclusive on the importance of safety valves in a safety instrumented system. The article, Valve failure: Not an Option, describes methods of implementing partial stroke testing (PST) to reduce the probability of failure upon demand, average (PFDavg). For those not familiar with a partial stroke test, I found this definition: […]

Considering the Tradeoffs in Safety-Certified Sensors

Posted in Measurement, Safety on Thursday, December 4th, 2008. No comments yet
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Emerson’s Dale Perry alerted me to a great article on safety-certified sensors in the November 2008 issue of Control Engineering magazine. Dale manages the Rosemount pressure measurement line of products. The article, Practice Safe Sensing; Safety-certified sensors promise to cut costs and boost performance. But the tradeoffs must be carefully considered., described the advances in […]