IEC 61508 Functional Safety Assessment Rosemount Inc. - Exida

Management summaryThis report summarizes the results of the functional safety assessment according to IEC 61508carried out on the:‣ Model 3051 C/T/L Safety Pressure Transmitter with option code QTThe functional safety assessment performed by exida consisted of the following activities:- exida certification assessed the development process used by Emerson ProcessManagement through an audit and creation of a detailed safety case against therequirements of IEC 61508.- exida certification performed a detailed Failure Modes, Effects, and Diagnostic Analysis(FMEDA) of the devices to document the hardware architecture and failure behavior. Thisincluded detailed Markov models of the fault tolerant architectures done in order to showaccurate average probability of failure on demand.The functional safety assessment was performed to the requirements of IEC 61508, SIL 3. A fullIEC 61508 safety case was prepared using the exida SafetyCaseDB tool, and used as the primaryaudit tool. Hardware and software process requirements and all associated documentation werereviewed. Also, the user documentation (safety manual) was reviewed.The results of the Functional Safety Assessment can be summarized by the following statements:The Model 3051 C/T/L Safety Pressure Transmitter with option code QT was found to meetthe requirements of SIL 2 for random integrity @ HFT=0, SIL 3 for random integrity @ HFT=1and SIL 3 capable for systematic integrity.The manufacturer will be entitled to use the Functional Safety LogoThe manufacturermay use the mark:© exida Certification rosemount 11-07-062 r007 v1 r1 iec 61508 assessment.docx, 3/8/2012Michael Medoff Page 2 of 21