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OIMLTC8/SC71WDOIMLR137-1&-2Date:28April2009K:\Algemeen\OIML\OIMLgas\draftR137-1-2-3\1WDR137-1+209-04-28.docPage1of57COMMITTEEDRAFTOIMLWD1Date:28April2009Referencenumber:……….Supersedesdocument:N/AOIMLTCX/SCXCirculatedtoP-andO-membersandliaisoninternationalbodiesandexternalorganisationsfor:Title:Gasmetersdiscussionat(dateandplaceofmeeting):........Secretariat:TheNetherlandscommentsby:........vote(P-membersonly)andcommentsby:..........TITLEOFTHECD(English):OIMLR137-1and-2GasmetersPart1:MetrologicalandTechnicalRequirementsPart2:MetrologicalcontrolsandperformancetestsTITRLEDUCD(French):OIMLR137-1et-2CompteursdegazPartie1:Exigencesmétrologiquesettechniques,Partie2:ContrôlesmétrologiquesetessaisdeperformanceOriginalversionin:EnglishOIMLR137-1:2006(E)K:\Algemeen\OIML\OIMLgas\draftR137-1-2-3\1WDR137-1+209-04-28.docPage2of57Explanatorynotetothe1WD(TemporarysectiontoberemovedafterfinalizationoftheRecommendation)AfterOIMLR137-1GasmeterswasapprovedbyCIMLin2006andeffectivelypublishedin2007,andtheresponsibilityforthisRecommendationwastransferredtoTC8/SC7,thesecretarystartedtheworkdraftingPart2Metrologicalcontrolsandperformancetests.Butduringthiswork,itwasidentifiedthatafewminorchangesinPart1wouldbenecessary,althoughthereisnoformalprojectfortherevisionofPart1.Nevertheless,expectingthatthecurrentprojectforpart2willalsoleadtoarevisedPart1,thesecretaryinvestigatedwhatfurtherchangeswouldbeadvisable.ThisleadtothefollowingproposedchangesinPart1(2006):Definitionschangedincompliancewiththenew(2007)editionofthe―VIM‖.NotuseddefinitionsremovedSeparationinParts1and2inbetteraccordancewiththegeneralformatforOIMLRecommendations,presentedduringtheOIMLseminarinDouai(April2008).Inpart1onlytherequirementsarelisted,duetothefactthispartwillbeusedforlegislationandthereforeparagraph4.6isintroduced.Alsothepreviouschapters3uptoandincluding6arereshuffledtomakethedocumentinlinewiththegeneralOIMLformat.Addedrequirementsforthemainsvoltagetoclause4.1,ratedoperatingconditionsThereproducibilityrequirementisnowonlyprescribedforgasmeterswithinternalmovingparts,whilearepeatabilityrequirementisintroducedforgasmeterswithoutinternalmovingparts(4.6.1and4.6.2)ThetemperaturetestisnowprescribedfromQminuptoandincludingQmax,insteadfromQtuptoandincludingQmax(paragraph11.4.8).Thetemperaturetestwithgastemperatureunequaltoambienttemperatureisremoved.Thedampheat,steadystateanddampheatcyclictestareperformedattheuppertemperature(Table4).Thetest‗Orientationandflowdirection‘isbetterseparatedinto‗Orientation‘and‗flowdirection‘(4.6.3and4.6.4).TherequirementsforthedurabilitytestisnowfromQminuptoandincludingQmax,insteadfromQtuptoandincludingQmax(11.4.10and4.6.8).Forflowdisturbancestherequirementisthattheshifthastobe0,33MPE.However,inAnnexBstill0,33%wasmentioned.ThissentenceinAnnexBisremoved.Overviewofdocumentationfortypeevaluation(11.2)issimplifiedBibliographyisupdatedACvoltagedipsandsurgetestisbroughtinlinewithR117-1.TheDCrippletestisadded(4.6.14),inlinewithR117-1TheDCvoltagedipsareadded(4.6.14),inlinewithR117-1OIMLR137-1:2006(E)K:\Algemeen\OIML\OIMLgas\draftR137-1-2-3\1WDR137-1+209-04-28.docPage3of57ThetestmethodsforsomeEMCtests,likeESDandsurgesarechangedsuch,thatduringthoseEMCphenomenathemeterundertesthastofulfilthestatedrequirements,insteadofafterwards.ThisisinlinewiththeOIMLR117-1.Chapter9isaddedTheoriginalTable4isremoved,whiletheoriginalTable6ismovedtopart1(4.6.14).Testingoftheinfluenceofsoftwarefunctions(likecommunicatonpossiblities)onthemeteraccuracyisadded(4.6.15).OIMLTC8/SC71WDOIMLR137-1&-2Date:28April2009K:\Algemeen\OIML\OIMLgas\draftR137-1-2-3\1WDR137-1+209-04-28.docPage4of57ContentsForeword.........................................................................................................................................................31Scope......................................................................................................................................72Terminology...........................................................................................................................72.1Gasmeteranditsconstituents........................................................................................................................72.2Metrologicalcharacteristics............................................................................................................................82.3Operatingconditions.....................................................................................................................................102.4Testconditions...............................................................................................................................................112.5Electronicequipment....................................................................................................................................113Unitsofmeasurement...........................................................................................................123.1Measurementunits............................................