ARCHIVESHISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(73)595
Vol.1973/0120

Disclaimer
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COMMISSION OFTHEEUROPEAN COMMUNITIES
COM(73)595final
Brussels ,18April1973
i
PROPOSAL FORA
,COUNCIL DIRECTIVE OÎTTHE
APPROXIMATION OPTHELAWSOPTEEMEMBERSTATES
RELATING TOCOLD-WATER METERS
(submitted ,to*theCouncil ToytheCommission )
COM(73)595final

111/974/72/rev,2-E
AIMS
ThisDirective islaiddownpursuant toArticle 100oftheTreatyandin
conjunction withCouncilDirectiveof26July1971^ontheapproximation
ofthelawsoftheMemberStatesrelating tocommonprovisions forboth
measuring instruments andmethodsofmetrological control.
TheaimofthisDirective istoremovethetechnical barriers tointra-
Cornmunity tradewhichexistatpresentwithregardtowatermetersowing
tothedisparity inthenational lawsgoverning suchmetersintheMember
States.
Acomparative studyofthesystemsusedforwatermetersintheMember
Statesshowedthatthedifferences relatednotonlytothetechnical
specifications forconstruction andtotheconditions ofuse,butalsoto
theprecision andthecontrolmethodsappliedtothesemetersbeforethey
aremarketed andused.
Thesituation withregardtotradeissimilar,formanufacturers are
compelled todiversify theirproduction inordertotakeintoaccount
theregulations inforceintheMemberStateinwhichthewatermeters
aretobeused,andcontrols havetoberepeated andcarriedoutin
different ways.
Sincepresentnational lawsarejustified bytherightfuldesireto
protecttheconsumer andtheuser,theharmonization oftheselawsseems
tobetheonlysuitable methodofremovingthedifficulties resulting
fromtheirdivergence andofcreatingtheconditions recfuired for
establishing thecommonmarket.
(1)OJNoL202,6September 1971.

-2- 111/974/72/reVo2-E
Population growth,urbanization ,sanitation ,modernlivingand
industrialization havenecessitated theuserofever-increasing
quantities ofwaterinspecificareas,andfacilities alreadyin
existence ,suchaswells,aqueducts ,etc.,havehadtohesupplemented
bylargerandlargerinstallations ..
Inthecountries oftheEuropean Economic Community thewaterrequire­
mentswhichhavetobemetnowconstitute adifficult andcostly
problem :thewaterhastobeobtained andthendistributed in
accordance withprecisebacteriological standards .Fromacommon,freely
available ,cheapsubstance ,atleastinmostofthetemperate regions
intheCommunity ,waterhasbecomeaprecious commodity thepriceof
whichisconstantly rising.
Localdistribution services ,bothpublicandprivate ,haveforalong
timebeencontenttosupplywaterfora"lumpsum"onthebasisof
varyingcriteria :numberofinhabitants ,sizeoftheareaserved,etc.
Theamountspaidbyuserswerenotinproportion tothequantities
consumed ,andallowedconsiderable wastagetooccur.
Ithasgradually becomenecessary tomeasurewaterbymeansofmeters
whichgiveasufficiently accurateindication ofthequantities ofwater
used.
Thisistheoriginofthewaterengineering industry ,whichcovers }apart
fromthemanufacture ofmeters,theproduction ofalltheequipment
required forcatchment andtreatment andforinvoicing onthebasisof
periodical meter-readings .
Thepresentsituation asregardsthemeasuring ofwaterisasfollows:
generally speaking ,everynewhomeisfittedwithahousehold meter.As
approximately twomillion newhomesarebuilteveryyearintheCommunity ,
anequivalent numberofnewmetersareinstalled everyyear.Asexisting
watermetersha\retobereplaced orrepaired atleastevery20years,at
leastthesamenumberagainshouldbeestimated .Theproduction ofmeters
otherthanforhousehold use,i.e.,largerorspecialmeters,maybe
estimated asbeingone-tenth ofthatofhousehold metersfornewhomes,
theiraveragecostbeingofanatleastcomparable order.

-3- III/974/72/rev.2-E
Onthebasisofanaveragevalueof10u.a.forsmallmeters,the
production ofwatermeterswouldalonerepresent avalueofmorethan
60millionu.a.Theturnover "basedontheuseofthesemetersis
difficult toestimate asthepriceofwatervariesfrom0.2to.morethan
0.5u.a.percubicmetreandthenumberofmetersinuseisdifficult to
calculate .Ifafigureof50millionistakenasthenumberofmeters
inuse,registering onaverage50cubicmetresofwaterayearatan
averagepriceof0.3u.a.,thetotalreachedwouldbe800millionu.a.
forthevalueofwaterconsumed andinvoiced .
Inthelightofallthesefigures,although onlyapproximate ,andthe
factthatthepriceofwaterisbeingincreased everywhere ,owingtothe
increasing expenditure forcatchment ,pipingandtreatment ,itispossible
toappreciate theimportance ofharmonizing theconditions relatingto
theconstruction ,precision andcalibration ofwatermeters.
Thetechnical Annextotheattached Directive hasbeendrawnupinthe
lightoftheopinions ofgovernment expertsfromKemberStatesandof
representatives ofbothconstructors andusers,i.e.,waterdistributors ,
withtheaim,also,ofprotecting consumers 1interests .

-4- III/974/72/rev.2-E
HAIÎMOETZATIOZT KETHCD
Themethodofharmonization usedisofthetypeknownasoptional ,
similartothatusedformostofthespecialDirectives onmeasuring
instruments .Theoptional harmonization methodisrecognized inthe
samewayasthetotalharmonization method "byCouncilDirective of
26July1971relatingtocommonprovisions forbothmeasuring
instruments andmethodsofmetrological control.Theuseofthe
totalmethodwouldraiseseriousproblems unlessthemainbodyof
non-technical provisions ,relatinginparticular totheuseofwater
metersandcontrolcharges,hadbeenharmonized .
Theadoption oftheoptional harmonization methodmeansthatwatermeters
whichmeettherequirements ofthisDirective maybefreelymarketed 'and
usedthroughout theCommunity andwithinindividual MemberStates,as
maymeterswhichhavesatisfactorily undergone national controls within
individual MemberStates.
CONSULTATION OPTH3EUROPEAN PARLIAMENT ANDTHEFECHOIIIC ANDSOCIAL
–RT~r-Il'ili»111ni■•-11111 UNMImm■■■■■■1 1m1m 11 mi<11NriunN1MI■!■■■1RIir 1-n
COÎMITTEE
Theopinionofthesetwobodiesisrequired underthesecondparagraph
ofArticle 100.Theimplementation oftheDirective willmakeit
necessary forcertain MemberStatestoamendtheirlaws.

-5- 111/974/72/rev.2-E
AFiUTCTOTHELISTOFAI'ÏS
Lavsrelating towatermetersinforcemMemberStates
5SLCIU M
ITone
EElWARK
ITone
WESTGERÎIAÏJY
–Lawrelating tometrology andtheverification ofweightsandmeasures
(Calibration Law-Eichgesetz )of11July1969°
–Rulesontheverification ofveightsandmeasures intheversionofthe
14thRegulation amending therulesontheverification ofweightsand
measures 0
ERAÏÏCE
-Ordonnance Kb45-2405of18October 1945onmeasuring thevolumeof
liquids.
-Debretof30November 1944issuingagovernment regulation onthe
controlofmeasuring instruments .
-SecretNo72-535of10May1971issuingaregulation onthecategory
ofmeasuring instruments represented bywatermeters.
–ArrêteduPréfetdelaSeineof12August1957»
IRELAED
Uone
ITALY
ITone
LUXEMEOURCr
None
KSTHBRLAMDS
ïïone
UNITED IŒMÏÏXM
None

-6- 111/974/72/rev.2-
PROPOSAL FORACOTOICIL DIRECTIVE
ontheapproximation ofthelawsoftheMemberStates
relatingtocold-water meters
(presented "bytheCommission totheCouncil)
THECOUNCIL OPTEEEUROPEAN COMMODITIES .
I
HavingregardtotheTreatyestablishing theEuropean Economic Community ,
andinparticular Article 100thereof;
HavingregardtotheProposal fromtheCommission ;
HavingregardtotheOpinionoftheEuropean Parliament ;
HavingregardtotheOpinionoftheEconomic andSocialCommittee ;
WhereasintheMemberStatestheconstruction andthemethods ofcontrol
ofwatermetersaresubjecttomandatory provisions whichdifferfrom
oneMemberStatetoanotherandthushindertrade;whereasthese
provisions shouldtherefore beapproximated ;
WhereasCouncilDirectiveof26July1971^"^ontheapproximation ofthe
lawsoftheMemberStatesrelatingtocommonprovisions forboth
measuring instruments andmethodsofmetrological controllaiddownthe
procedures forEECpatternapproval andEECinitialverification ;whereas
inaccordance withthisDirective ,thetechnical requirements forthe
designandfunctioning ofwatermetersshouldbelaiddown;whereassuch
requirements mustbemet,andthecontrols mustbecarriedout,andthe
appropriate signsandmarksaffixed,beforetheseinstruments canbe
freelyimported,marketed andused;
Whereastheabovementioned Directive alsostipulates thattheseparate
directives mayspecify,whereconditions allow,thedateonwhicheach
MemberStatewillrevoketheprovisions ofnationaloriginapplicable
toinstruments coveredbyCommunity provisions ;whereasinthiscase,
itisnotyetpossible tofixthisdate;
HASADOPTED THISDIRECTIVE :
(l)OJNoL202,6September 1971.

-7- 111/974/72/reVo2-E
Article 1
ThisDirective shallapplytocold-water meters,whichareintegrating
measuring instruments forcontinuously determining thevolumeofwater
(andnootherliquid),passingthroughthan,"bymeansofadirect
meohanical processinvolving theuseofvolumetric chambers with
movablewallsortheactionofthevelocityofthewateronthe
rotationrateofamovablepart(turbine,impeller,etc.).'Water
shallbeconsidered tobe"cold"whenitstemperature isintherange
0-40°C.
Article 2
WatermeterswhichmaybeartheKiXJmarksandsignsaredescribed in
theAnnextothisDirective .Thesewatermeterscomprise ameasuring
devicelinkedtoailindicating device.TheyshallbesubjecttoEEC
patternapproval andsubmitted toEECinitialverification .
Article 3
NoMemberStatemayprevent,prohibit orrestricttheplacingonthe
marketorentryintoserviceof;atermetersbearingtheESCpattern
approval signandtheEECinitialverification mark.

-8- 111/974/72/rev.2-E
Article 4
1.MemberStatesshallputintoforcethelaws,regulations and
administrative provisions neededinordertocomplywiththis
Directive withineighteen monthsofitsnotification andshall
forthwith informtheCommission thereof .
2.MemberStatesshallensurethatthetextoftheprovisions of
•national lawwhichtheyadoptinthefieldcoveredbythis
Directive arecommunicated totheCommission ..
Article 5
ThisDirective isaddressed totheMemberStates .
DoneatBrussels .

-1- 111/974/72/rev.2-E
ΑΙΐΝΕΧ
I.TER?HITOLOCT AKDBEFIHITI0H5
1.1Plowrate
Theflowratexsthevolumeofwaterpassingthroughthemeterperunit
time,thevolume "beingexpressed incubicmetresorlitresandthetime
inhours,minutesorseconds.
1.2Volumecelivered
Thevolumedelivered ,isthetotalvolumeofwaterpassedthroughthe
meterinagiventime.
1.3Maximum flowrate
Themaximumflowrate,Qp^-y,isthehighestflowrateatwhichthemeter
canfunction overbriefperiodswithout damage,andwithoutexceeding
eitherthemaximumpermissible errorsorthemaximumpressure-loss value.
1.4Nominalflowrate(Qr,)
Thenominalflowrate,Qn,isequaltohalfthemaximumflowrate,O^y.
Itisexpressed incubicmetresperhourandisusedtodesignate the
meter.
Atthenominalflowrate,Qn,themetershouldbeabletofunctionin
normaluse,i.e.,incontinuous andintermittent operating conditions ,
withoutanychangeinitsmetrological capacities andwithoutexceeding
themaximumpermissible errors.

-2- 111/974/72/rev.2~E
AHHEX
1.5Minimumflowrate(Q^in)
Theminimumflowrate,Qmin,istheflowrateabovewhichthemaximum
permissible errorsmustbetakenintoaccount.-Itisfixedasa
function ofCL,.
1.6Flowrange
Theflowrangeofawatermeterliesbetweenthemaximumandminimum
flowrates,Qmaxand Itisdividedintotworegions,termedupper
andlower,withdifferent maximumpermissible errors.
1.7Transitional flowrate(Q-fc)
Thetransitional flowrateistheflowratewhichdividestheupper
andlowerregionsoftheflowrangeandtherateatwhichthereisa
changeinthemaximumpermissible errors.
MYTHOLOGICAL CHARACTER ■
J Maximumpermissible errors
Themaximumerrorpermitted inthelowerregion,fromQmininclusive
toQ-tnon-inclusive ,is«jfo.
Themaximumerrorpermittedintheupperregion,fromfy.inclusiveto
CL.'inclusive ,isi2

-3- III/974/72/rev.2-E
AHÏÏEX
2.2Characteristics ofnotrolo^ical classes
ClassesQn
<15»Aj>15m"Vli
ClassAî
Sain0.04
0.100.15^
0.30Q
ClassB:
Snin
%0.02
0.03Q.71|0.04\
|C"20Sl
1
Class C:
Sain
%\
|
|0.01^
I0.015^
!I
I
I0.006
:0.015
111*TECHNOLOGICAL characteristics ■
3.1Principle
Themetersshouldbeconstructed insuchaw?yastoensurelongtamper-
proofserviceandshouldconformwithsafetyandpublichealthregulations
undernormalconditions ofuse.

-4- in/974/72/rev.2-E
AMEX
Theyshouldhecapableofwithstanding anaccidental reversal offlow
withoutanydeterioration orchangeintheirmetrological properties ,
andtheyshouldhecapableofrecording suchareduction .
3.2Materials
Thevariousconstituent partsofthemetersmaybeconstructed using
anymaterialsuitedtonormaluseconditions ,totheconditions relating
topublichealthandto:
–mechanical strength
–corrosion resistance
–dimensional stability
–behaviourinrelationtotemperature (0~40°C)
-•behaviour inrelation todeposits .
3.3Pressure-tightness .–•-
Themetersmustwithstand-withoutfunctioning defect,outleakage,
seepagethroughthewallsorpermanent deformation -thecontinuous
waterpressureforwhichtheyaredesigned .Theminimumvalueofthis
pressureis10bars.
' *
3.4Pressure loss
Thepressurelossthroughthemeterisdetermined bypatternapproval
tests,andmustnotexceedonebar*

-5- 111/974/72/rev.2-
A1TWX
Forcertainpatterns,thepressurelossmaybelessthanone"bar.Prom
thetestresultsthepatterns canbedividedintofourgroupsaccording
totheirconformity withoneofthefollowing maximumvalues:1,0.6,
0.3and0.1"bar.Therelevant valueisshowninthepatternapproval
decision .
3.5Indicating device
/
Theindicating devicemustallow,"bysimplejuxtaposition ofitsvarious
constituent parts,areliable ,easyandunambiguous readingofthe
volumeofwatermeasured ,expressed incubicmetres.Thevolumeis
giveneitherby*
(a)thepositionofoneormoreneedlesoncirculardials;
(b)arov/ofconsecutive digitsinoneormoreapertures ;
(c)acombination ofthesetwosystems.
Thecubicmetreanditsmultiples aretobeindicated inblack,and
sub-multiples ofthecubicmetrearetobeshowninred.
Thevisibleheightoftherowofdigitsmustbeatleast4mm.
Ondigitalindicators (types(b)and(c))visibledisplacement ofall
digitsmustbeupwards.Ifthereverseisthecase,thisshallbe
indicated byanarrow.Theadvanceofanygivendigitmustbecompleted
whilethedigitimmediately following passesthroughthefinalone-tenth
ofitsadvance.Acommamustbeplacedafterthefigureindicating the
numberofcubicmetres.

-6- IIl/974/72/reVo2-H
ΑΙΓιΤχ:
Indicators ofthedialtype(aandc)shouldrotateinaclockwise
direction .Thevaluesincubicmetresforeachdialshouldbeexpressed
as10xnfwherenisapositiveornegative wholenumberorzero,giving
asystemofconsecutive decades .Thefollowing shouldbeshownneareach
dial:
χ1000,χ100,χ10,χ1,χ0.1.χ0.01,χ0.001.
Theunitsymbol m,whichistheindication unit,shouldbeshowneither
onthedialoriramediatelybesidethedigitalindicator .
Inbothcases(dialanddigitalindicators ),thefastestgraduated
component ,whichisthecontrolcomponent andisknownasthe"verification
unit",shouldmovecontinuously .Thiscontrolelementmaybepermanent
ormaybefittedtemporarily byaddingmovingparts.
Thelengthoftheverification unitshouldbenotlessthan1mmandnot
morethan5nun.Itconsists eitherofcontrasting bandsequalinlength
totheunitoroflinesofequalthickness notexceeding onequarterof
thedistance betweentheaxesoftwoconsecutive lines.Onlythelength
ofthelinesmaydiffer.
Hoever,foraperiodoffiveyearscommencing withtheimplementation
ofthisDirective ,
(a)downwards advanceofdigitswillbepermissible ,thismovement
beingindicated byanarrow;
(b)thelengthofthescaledivision maybe0.8mm.
3.6Numberoff-'.g?i.resandvaluesofverification unit
Itmustbepossible fortheindicating devicetorecord,without
returning tozero,avolume,expressed incubicmetres,corresponding
toatleast1999hours'operation atthenominalflowrate.
Theverification unitmustbesmallenoughtoensure,whenverification
isbeingcarriedout,ameasurement inaccuracy of0.5$,allowingfora
possibleread-outerrorof1mm,andsmallenoughtoneedonlyafairly
lowminimum flowratesuchthatthetestdoesnottakemorethanone
andahalfhours.

111/974/72/rev .2-E
AHHEX
Asupplementary device (star ,disc with areference mark ,etc.)maybe
added inorder toshow themovement ofthemeasuring device "before this
becomes clearly visible ontheindicating device .
3.7 Regulating device
Themeters maybefitted with aregulating davice'with which itis
possible toalter therelationship between thevolume indicated andthe
volume actually passed .This device iscompulsory formeters which
make useoftheaction ofthevelocity ofthewater ontherotation of
amovable part .
3.8Accelerating device
Theuseofanaccelerating device forincreasing thespeed ofthemeter
below G. isprohibited .
IV.MARXS AKD IHSCRIFTIOHS
4.1Identification inscriptions
Itiscompulsory forallmeters tocarry ,inalegible andindelible
manner ,either separately orinagroup ,onthemeter casing ,the
indicating device ,ortheindication plate ,thefollowing information :
(a)name ortrade naae ofthemanufacturer orhistrademark ,
(b)metrological class andnominal flow rate incubic metres
perhour ,
(c)pattern ,year of 'manufacture ,serial number ,
(d)anarrow showing thedirection offlow ,
(e)theESCpattern approval symbol ,
(f)thepressure inbars ifitcanbehigher than 10bars ,
(g)"vertical "or"horizontal "ifthemeter canoperate inonly
oneofthese twopositions ,
(h)anyspecial features .

-8- 111/974/72/rev.2-E
AITNEX
4»2Placingofseals
Metersshould "bearsealswhichpreventaccesstotheinternal components !
inparticular ,itshould "benecessary todestroyasealinordertogain
accesstotheregulating device.
4.3Placingofverification narks
Spaceshouldbesetasideonanessentialpart(normallythemetercasing),
whichisvisiblewithoutdismantling ,fortheEECverification marks.
V.,PATTERU APFROVAL
5.1Procédure
Theprocedure forpatternapprovalv.'illbecarriedoutinaccordance
withtheDirective relatingtocommonprovisions forbothmeasuring
instruments andmethodsofmetrological control.
v5.2Patterntests
Whenithasbeenascertained fromtheapplication filethatthepattern
conformswiththeprovisions ofthisDirective ,laboratory testswillbe
carriedoutonanumberofinstruments underthefollowing conditions :
■5.2.1Numberofmeterstobetested
Thenumber ,ofmeterstobesubmitted bythemanufacturer isasshownin
thefollowing tables
•/.

-9- 111/974/72/rev.2-E
AMEDC
ITominalflowrate,Qn>m-'/h j
: IEumberofmeters
IUptoandincluding5 10
fMorethan5anduptoandincluding 50 6
[Ilorethan50anduptoandincluding 1000
IMorethan1000 1
5.2.2Pressure
Forthemetrological tests(5.2.4),"thepressureatthemeteroutlet
shouldbeatleast0.2barhigherthantheambientatmospheric pressure .
5.2.3TestequiTiment
Themetersareusuallytestedindividually and,ineachcase,insucha
wayastodemonstrate theindividual characteristics ofeach.
Themetrological serviceoftheIlemborStatewilllaydowntheprovisions
requiredtoensurearelative maximuminaccuracy of0.2$inthemeasurement
ofthevolume,accountbeingtakenofthedifferent causesoferrorin
installation .
Themaximumpermissible inaccuracy withregardtothemeasurement ofthe
pressureis2^.
Duringeachtest,therelativevariation intheflowratesshouldnot
exceed

-10- III/974/72/rev.2-E
AITFEX
Irrespective oftheplaceinwhichthesetestsarecarriedout,
installation shouldbeapproved "bythemetrology serviceoftheMember
Stateconcerned .
5-2.4Testprocédure
Thetestscomprisethefollowing' operations ,carriedoutintheorder
shown:
(1)pressure-tightness tests,
(2)determination oftheerrorcurvesonthebasisoftheflow
rate "byascertaining theeffectofthepressure andtaking
intoaccounttheinstallation conditions (straightsections
upstream anddownstream ,throttling ,obstacles ,etc.)
stipulated bythemanufacturer ,
(3)determination ofpressurelosses,
(4)accelerated endurancetest.
Thepressure-tightness studycomprises thefollowing twotests:
(l)eachmetershouldbeabletowithstand ,withoutleakageor
seepagethroughthewalls,apressureof1.6timesthe
maximumoperating pressure ,appliedforaperiodof
15minutes,
(2)eachmetershouldbeabletowithstand ,withoutanydamage
orblockage ,apressure twicethemaximumoperating pressure ,
appliedforaperiodofoneminute.
Tests(2)and(3)shouldprovideasufficient numberofpointstoenable
thecurvestobeplottedadequately fromstart-up tomaximumflowrate.
Theaccelerated endurance testistobecarried outasfollows :

-11- 111/974/72/rev.2-E
AIŒEX
Hominal
flowrateQ-.,
inm3/hχ65υ
flowrateTypeof
testIJumber
of
cyclesDurâtion
ofpauses
(sec)IPeriodof
Ioperation
[attest
|flowrateDurâtionof
start-up
andrun-dovjn
(sec)
Qn*52Q*diseontmuous
continuous100000
t I5 !
I
J]
5sec .
100h1
5<SL41000.5^
2Qh
I
1discontinuous
1
Icontinuous
lcontinuous
\
ï
f100000 100.20/q/*
witha
minimum
of5-
seconds
100h
100h0.15/Oy*
witha
minimum of
5seconds
Q>100r
I0.5Ql
ΛI
|continuous
1continuous
continuous
continuous1iI
!
'300h
i
i500h
I
;100h
100h1
/%/anum*)ere<Tu-al"tothevalueofQnexpressedinm/h.
Allthetestsaretobecarriedoutattheaveragetemperature of
thewaterinthelaboratory .

-12- III/974/72/rev.2-S
AMEX
Beforethefirsttestandaftereachseriesofteststhemeasuring errors
must "bedetermined ,asaminimumrequirement ,atthefollowing flowrates:
Snin"Qt**0,3Si"°°5Si"1Si~2Si'
5.2.5Patternapproval decision
Awater-meter patternwill "beapprovedifitfulfilsthefollowing
oond.itions:
(a)itconformswiththe'administrative andtechnical provisions
ofthisDirective andtheAnnexthereto ;
(b)-tests1-3underparagraph 5°2.4showthatitconformswith
PartsIandIIofthisAnnexasregardsmetrological and
technological characteristics ;
(c)aftertest4underparagraph 5=2.4novariationgreaterthan
2eLbetween Q,andQorgreaterthan3$between ©.andQ,' tTiax & ' iTim t
hasbeenobserved .
VI.INITIAL VERIFICATION
Thiswillbecarriedoutinaplaceapproved bythemetrology serviceof
theMemberState.Thelayoutofthepromises andthetestequipment
shouldbesuchthatverification maybecarriedoutinsafe,reliable
conditions ,andwithnolossoftimeforthepersonresponsible forthe
control.Theprovisions ofparagraph 5'2.3shouldbocompliedwith,but
themetersmaybetestedinseriesifdesired .Ifthismethodisemployed ,
thepressure inallthemetersshouldbehigherthan0.2barandspecial
measures mayberequired topreventinterference betweenmeters.
Thecompleteunitmayincludeautomatic devices,bypasses ,flow–
restrictors ,etc.,providedthateachtestcircuitbetweenthemetersto
beverified andthecontroltanksisclearlydefinedandthatitis
alwayspossible toverifyitsinternal pressure-tightness .

-13- 111/974/72/rev.2-E
ΑΜΕΧ
Anytypeofwatersupplysystemmay"beused,"butifseveraltestcircuits
areoperatedinparallel ,thereshouldbenointerference betweenthem.
Ifacontroltankisdividedintoseveralchambers ,theseparating walls
shouldbesufficiently rigidtoensurethatthevolumeofachamberdoes
notvarybymorethan0„2/oaccording towhethertheadjacent chambers
arefullorempty.
Verification includes anaccuracytestatthefollowing threeflowrates:
\
(a)between0.9QandQwithobservation ineachcaseofthema:: max
reduction inflow,whichshouldbelessthanthevalue
indicated inthepatternapproval decision ;
(b)between Q,and1.2Q,;
X X
(c)between Q_.and1„1x
Themaximumpermissible errorsareassfcouninparagraph 2.1.
Ineachtest,thevolumeofwaterpassedthroughthemetershouldbe
sufficient toeliminate theeffectsofcyclicaldistortion andto
compensate foranyirregularities causedbypossibleeccentricity ofthe
needleoftheindicator . \
o o
0