Table 1 : Hardware safety integrity : architectural constraints on type A safety-related subsystems Application of safety integrity level assessement procedureĥ.1.1 Description and functional analysisĥ.2 These are the “ worst cases ” assumptions for the SIL calculationsĥ.2.8 quality requirement observance examinationĥ.3 Case study of Safety level detection safety deviceĥ.4 Case study of pressure and température safety devicesĦ.1 Main differences between ATEX standards and IEC 61508Ħ.2 Classification of ATEX safety devices according to IEC 61508įigure 2 : Failure distribution according to their effectįigure 4 : Redundant system state modellingįigure 5 : Redundant system state reduced modellingįigure 8 : Pressurised box protection device

Risk analysis – HAZARDOUS event definitionĤ.3 Second stage : failure rate predictionĤ.4 Third stage : failure modes effects and criticality analysis (FMECA)Ĥ.5 Fourth stage : modelling of the system's various statesĤ.5.3.1 Influence of testability on safetyĤ.6 Fifth stage : Safety integrity level assessmentĥ. Safety requirements of IEC 61508 standardĢ.1 Safety system grading - ClassificationĢ.2 Architectural constraints on hardware safety integrityĢ.3 Quantitative requirements of IEC 61508Ģ.5 Differences between hardware fault tolerance of IEC 61508 and of ATEX standardsĢ.6 Differences between IEC 61508 safety - reliabilty and of ATEX standards infaillible componentsģ. Scope of the document– limits of the studiesĢ. Annex D - Study of ‘ Used Safety Devices’ġ.

RSS Guard 4.5.4 instal