ForewordIntroductionScopeNormative referencesTerms and definitionsSymbols and abbreviationsSymbolsAbbreviationsPrincipleGeneralLimitationsMeasurement site and installationTesting laboratories performing SRM measurementsOngoing quality assurance during operationGeneralProcedures to maintain ongoing qualityChoosing control chartsGeneralShewhart chartEWMA chartBuilt-in methodsSetting parameters for control chartsCalculation of the standard deviation S using performance dataSetting limits for control chartsAlternative approach for setting the control chart limitsZero and span measurementsGeneralFrequency of zero and span measurementsExtractive gas analysis systemsIn situ and cross-stack gas-monitoring AMSAutomatic zero and span checksReplacing gas bottles or other surrogatesDocumentation of control chartsCheck on validity of measured valuesAnnual surveillance test (AST)Functional testParallel measurements with an SRMData evaluationCalculation of variabilityTest of variability and validity of the calibration functionAST reportDocumentationAST functional test of AMS (normative)GeneralAlignment and cleanlinessSampling systemDocumentation and recordsServiceabilityLeak testZero and span checkLinearityInterferencesResponse timeReportTest of linearity (normative)Description of the test procedureEstablishment of the regression lineCalculation of the residuals of the average concentrationsTest of the residualsDocumentation (informative)PrincipleSetting-up of the AMS fileManagement of the AMS fileComposition of the AMS fileIdentification recordFollow-up recordVerification reportCalibration reportIntervention reportShewhart control charts (informative)Exponentially weighted moving average (EWMA) charts (informative)Example of calculation of the standard deviation σ of the AMS at zero and span level (informative)Bibliography