Industry’s first complete SIL 3-certified valve assemblies
These Fisher Digital Isolation final-element solutions (photo) meet the design process requirements of safety integrity level (SIL) 3 per the IEC 61508 standard, making them suitable for shutdown valves in critical safety instrumented system (SIS) applications. Without this solution, users must specify all the individual valve components, procure each one, and assemble it into a working whole. Even if these steps are done correctly, this type of custom assembly will still not provide all the benefits of the Digital Isolation assembly, says the company. The various components are specifically selected to satisfy the application requirements. The entire assembly is sold as a fully tested and certified unit, with a single serial number and associated documentation delineating the details of every part of the assembly. — Emerson, Marshalltown, Iowa