Designation:D5540−13(Reapproved2021)StandardPracticeforFlowControlandTemperatureControlforOn-LineWaterSamplingandAnalysis1ThisstandardisissuedunderthefixeddesignationD5540;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoverstheconditioningofaflowingwatersamplefortheprecisemeasurementofvariouschemicalandphysicalparametersofthewater,whethercontinuousorgrab.Thispracticeaddressestheconditioningofbothhigh-andlow-temperatureandpressuresamplestreams,whetherfromsteamorwater.1.2Thispracticeprovidesproceduresfortheprecisecontrolofsampleflowratetominimizechangesofthemeasuredvariable(s)duetoflowchanges.1.3Thispracticeprovidesproceduresfortheprecisecontrolofsampletemperaturetominimizechangesofthemeasuredvariable(s)duetotemperaturechanges.1.4ThevaluesstatedinSIunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesafterSIunitsareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.6Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D1066PracticeforSamplingSteamD1129TerminologyRelatingtoWaterD3370PracticesforSamplingWaterfromFlowingProcessStreamsD3864GuideforOn-LineMonitoringSystemsforWaterAnalysis3.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthisstandard,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoTh...
