Designation:D6621−21StandardPracticeforPerformanceTestingofProcessAnalyzersforAromaticHydrocarbonMaterials1ThisstandardisissuedunderthefixeddesignationD6621;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticeservesasapracticalguidefortheperfor-mancetestingofprocessstreamanalyzersspecificallyformeasuringchemicalorphysicalcharacteristicsofliquidaro-matichydrocarbonmaterialsforproductionorcertificationofthesematerials.Thepracticemaybeapplicabletootherhydrocarbonstreamanalyzersaswell.1.2Onlyexternalmethods(completesubstitutionoftheprocessstreamwithastandard)ofcontrolsampleintroductionareincluded.Internalmethodsarebeyondthescopeofthispractice.1.3Methodsforresettingkeyoperationalparametersofanalyzerstomatchpredefinedlimitsareprovidedbyvendorsandarenotincludedinthispractice.1.4AnalyzervalidationproceduresarecoveredinPracticesD3764andD6122,notinthispractice.1.5Proceduresforstatisticallyinterpretingdatafromauto-maticsamplingprocessstreamanalyzersareoutlined.1.6TheimplementationofthispracticerequiresthattheanalyzerbeinstalledaccordingtoAPIRP-550(1),2andbeinagreementwiththeanalyzersupplier’srecommendations.Also,itassumesthattheanalyzerisdesignedtomonitorthespecificmaterialparameterofinterest,andthatatthetimeofinitialorperiodicvalidation,theanalyzerwasoperatingattheconditionsspecifiedbythemanufacturerandconsistentlywiththeprimarytestmethod.1.7Theunitsofmeasureusedinthispracticeshallbethesameasthoseapplicabletothetestprimarymethodusedforanalyzervalidation.1.8Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpractices,anddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.9Thisinternationalstandardwasdevelopedi...
