ASperiso4064:2014awatermeterisdesignatedbythenumericalvalueofpermanentflowrate,Q3,andr.aseriesofvaluesofQ3rangingfrom1m3/h to 6300 m3/h is given in theStandard.thelistmaybeextendedtohigherorlowervaluesintheseries.SimilarlythevaluesofQ3/Q1,rangingfrom40to1000isalsopresented.theratiooftransitionalflowratetominimumflow rate,Q2/Q1,is1.6andtheratioofmaximumflowratetopermanentflowrate,Q4/Q3,is1.25.thusonselectingrandQ3allotherflowratescanbecalculated.theintroductionofrratioistohaveflexibilityinchoosingminimumflowrateforthemetersbasedonthesensortype.whileselectingwatermeterstheutilitieshavetospecifytheexpectedmaximumandminimumflowrateinthewaterdistributionlinessothatasuitablemeterspecificationcanbeframed.Q3/Q1ratioof80isnearlyequivalenttoclassbmetersasperis779andiso4064:1993. Q3 of 2.5 m3/h and R 80 has Q1 0.031 m3/h and Q4 3.125 m3/h which is very muchclosetotheflowrangeof15mmclassbwatermeter。
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