1、5,7,6+67$1$5%6(1*DVPHWHUV7XUELQHJDVPHWHUVThis European Standard EN 12261:2002, with the incorporation ofAmendment A1:2006 has the status of a British Standard, present to the responsible European committee any enquiries on theinterpretation, or proposals for change, and keep the UK interests inform
2、ed; monitor related international and European developments andpromulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 52, an inside back cover and a back cover.The BSI copyright date displayed in this document indicates w
3、hen thedocument was last issued.ISBN 0 580 39744 0 BSI September 200616458 September 2006 See national foreword$PHQGPHQWVLVVXHGVLQFHSXEOLFDWLRQ$PG1R DWH all influence quantities, except the one under test, are kept relatively constant at their reference value.“ iiviiVi/ i-ViLiiiviiViv iLV/ iiiiviiVi
4、iVi iiVi ii iLVii iivi iiviiViLiiii i v v ii LV i i Vi Lii i iiviiVi iiiv iLViviiiVii /iip/iiipViVii x /iivL /iivFor the purposes of this European Standard, the following terms and definitions applyLiiimeasuring device in which the dynamic forces of the flowing gas cause a turbine wheel to rotate wi
5、th aspeed as a function of the volume flow rate. The number of revolutions of the turbine wheel is the basisfor the indication of the volume passed through the meter!It is designed to measure, memorize and display the volume of a fuel gas that has passed through it“iivolume in cubic metres, at meter
6、ing conditions3.1.3volume flow ratevolume at metering conditions divided by timerangeabilitythe ratio between Qmiand Qmax, i.e. the minimum and maximum flow rate respectively for which themeter performs within the maximum permissible errorsxaverage velocityvolume flow rate divided by the cross-secti
7、onal area of the meter connections3.1.6Vpressure containing structure of the meteriiiiimetering pressure ( )absolute gas pressure to which the indicated volume of gas is relatediiigas pressure within the piping containing the meteriiiallowable pressure range over which the meter is calibrated and pe
8、rforms within the meetrological requirements3.1.7.4!operating temperature range“range of metering temperatures over which the meter operates within the metrological requirements3.1.7.5iiipressure on which design calculations are based n in iiV i vi vViv ii V i v iviiVii Vi i ii vi L ii i Li V iVii i
9、 Viiiv iLiiiiv iiViVn* i iViiviviiViiiiVLviV ViV ViVvVivii iiiVi iii* viLii iLiiiVV v i i i v i iiiiiii ii v iii iii,iLi,iLiivi ivV +r,yyxi ii ii v i L i i i ii / i ii Li iLii iiivi/Liiv VVvLiii iiviiViiv ii iiiiiiiiViiL iv ivviiViLiii iVii6iviiVii6Vv i V i iii ii666rVVyviiiViLiiiViL iiiViv iLiii iV
10、iiLiviiVLViiVi viv 7LLiiLiiin S SVV iiVvVi v 7LLiiLiii Sx SVV iiVvVi!3.1.15 class 1,0 metermeter which has an error of indication between 2% an + 2% for flow rates Q where QminLVi iivi i-iiVvi/Li/Lip-L-L ,iiii 1V *iiVivvViiiiii ,iiiv ir iiiiiii iiii ViLii A Vii i i v iiiLii A i v iiii /i *ii *L+ 6iv
11、i ,i ,iLi /iii c1 ii 66 6i iVV iv i q-LV -i iiVv i i i -iVviV / iiVvV iiii LiiiVV* i -Vii/Li/Lipiii* i -V x xx x x x x x/ LiLi i-“x/ iiv iviiiViixxxx iiiiLViViii!Gas meters s hall be classified as class 1,0 with the maximum and minimum flow rates and nominaldiameters as shown in table 3.“/ i vi LiiV
12、vi v i i v V i iiii iiVvVviiivViiviVix “/ i vi VLV ii i Li , x v iiv iviiLii-“ iiv Liiix%. % 4ABLE !UTHORIZEDVALUESOF MAXIMUM FLOWRATES CORRESPONDING MINIMUM FLOWRATES ANDNOMINAL DIAMETERS2ANGEABILITY .OMINAL DIAMETERS $. 1MINMH 1MAX!“#MH ! HIGHSPEEDVERSION“ NORMALSPEEDVERSION PREFERRED # LOWSPEEDVE
13、RSION #ONNECTIONSAND DIMENSIONS4HE INLETAND OUTLETOFTHE METERSHALL HAVETHESAME NOMINAL DIAMETERAND CONNECTIONTYPE4HE PREFERRED OVERALL LENGTH IN MILLIMETRESOFTHE METERBETWEEN INLETAND OUTLET CONNECTIONS IS $.4OLERANCES ARE GIVEN IN )3/ h$ESIGNATION #h4HE PREFERRED LENGTH IN MILLIMETRES OF $. FORTHE
14、METERSHALL NOTBE EXCEEDED &ORSHORTERMETERSTHEMANUFACTURERSHALL BE ABLETO PROVIDE A hMAKEUPSPOOL PIECEhTO BRINGTHEIR BODY LENGTHS UPTO THEPREFERRED LENGTH WHEREREQUESTED4HE MAXIMUM OVERALL DISTANCE IN MILLIMETRES MEASURED FROMTHE EXTREMITYOF THE PROTRUDING PARTS TO THEMETER AXIS SHOULD NOTEXCEED PLUS
15、 $.&ORFLANGE CONNECTIONSREFERTO 4ABLE /iiii/ i i Liiiii v V i iiii iv iivViiVvV Lii!“ x iVivViiiix ii V ivii LiLiVi iiiviiVvixiL iiVivVi v ii v ii v ii v iiVii viv ii LVi i v ii V iii Li ivi i LiviiiiiiViviLiiiiiv iviiiiiV V iiVvii LiiiVVi / iiv iiLi x i Li Li iii i iiv iVi V iiVi/ iii Livi Vi V vviV iiVivViiiiiiv iivVLiiv iiiiii7 ii iiivivvi iv iv ii iiVi ,iLi x v
