Designation:D5540−13StandardPracticeforFlowControlandTemperatureControlforOn-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.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinforma-tiononlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1066PracticeforSamplingSteamD1129TerminologyRelatingtoWaterD3370PracticesforSamplingWaterfromClosedConduitsD3864GuideforOn-LineMonitoringSystemsforWaterAnalysis3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthispractice,refertoTerminologyD1129.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1approachtemperature,n—thedifferenceintempera-turebetweencoolingwatertemperatureinandsampletem-peratureout.3.2.1.1Discussion—Thistermisusedinheatexchangerapplicationsandappliestoalltypesofheatexchangers.Thetermisdefinedas:thedifferencebetweentheoutlettempera-tureinonestream...
