1、Designation:D662121Standard Practice forPerformance Testing of Process Analyzers for AromaticHydrocarbon Materials1This standard is issued under the fixed designation D6621;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of
2、last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice serves as a practical guide for the perfor-mance testing of process stream analyzers specifically formeasuri
3、ng chemical or physical characteristics of liquid aro-matic hydrocarbon materials for production or certification ofthese materials.The practice may be applicable to otherhydrocarbon stream analyzers as well.1.2 Only external methods(complete substitution of theprocess stream with a standard)of cont
4、rol sample introductionare included.Internal methods are beyond the scope of thispractice.1.3 Methods for resetting key operational parameters ofanalyzers to match predefined limits are provided by vendorsand are not included in this practice.1.4 Analyzer validation procedures are covered in Practic
5、esD3764 and D6122,not in this practice.1.5 Procedures for statistically interpreting data from auto-matic sampling process stream analyzers are outlined.1.6 The implementation of this practice requires that theanalyzer be installed according to APIRP-550(1),2and be inagreement with the analyzer supp
6、liers recommendations.Also,it assumes that the analyzer is designed to monitor thespecific material parameter of interest,and that at the time ofinitial or periodic validation,the analyzer was operating at theconditions specified by the manufacturer and consistently withthe primary test method.1.7 T
7、he units of measure used in this practice shall be thesame as those applicable to the test primary method used foranalyzer validation.1.8 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establi
8、sh appro-priate safety,health,and environmental practices,and deter-mine the applicability of regulatory limitations prior to use.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for
9、theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D3437 Practice for Sampling and Handling Liquid CyclicProductsD3438 Practice for Sampling and Handling Napht
10、halene,Maleic Anhydride,and Phthalic AnhydrideD3764 Practice for Validation of the Performance of ProcessStream Analyzer SystemsD3852 Practice for Sampling and Handling Phenol,Cresols,and Cresylic AcidD6122 Practice for Validation of the Performance of Multi-variate Online,At-Line,Field and Laborato
11、ry InfraredSpectrophotometer,and Raman Spectrometer Based Ana-lyzer SystemsE456 Terminology Relating to Quality and StatisticsE1655 Practices for Infrared Multivariate QuantitativeAnalysis3.Terminology3.1 Definitions:3.1.1 accuracy,ncloseness of agreement between a testresult and an accepted referen
12、ce value.3.1.2 analyzer output,nsignal that is proportional to thequality parameter being measured and suitable for input toreadout instrumentation.3.1.2.1 DiscussionIt may be pneumatic,electrical,digital,etc.,and expressed as psi,mv,sec.,etc.1This practice is under the jurisdiction of ASTM Committe
13、e D16 on Aromatic,Industrial,Specialty and Related Chemicals and is the direct responsibility ofSubcommittee D16.09 on On-Line Analysis.Current edition approved Nov.1,2021.Published December 2021.Originallyapproved in 2000.Last previous edition approved in 2017 as D6621 00(2017).DOI:10.1520/D6621-21
14、.2The boldface numbers in parentheses refer to the list of references at the end ofthis practice.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document S
15、ummary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principl
16、es on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?3.1.3 analyzer result,nnumerical estimate of a physical,chemical,or quality parameter produced by applying thecalibration model to the analyzer output signal.3.1.4 bias,nthe difference between the expectation of theresults and an accepted reference value.3.1.5 control sample,nmat
