ARCHIVES HISTORIQUES
DELACOMMISSION
COLLECTION RELIEEDES
DOCUMENTS "COM"
COM(75)573
Vol.1975/0216

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COMMISSION QFTHEEXJKQPEAN CÛMMUNI3ÏES
COM(75)573 final
Brussels ,17December 1975
PROPOSAI .FOR ACOUNCIL DIRECTIVE
ontheapproximation ofthe laws oftheMember
States relating ;to
CHECK-WEIGHING AND GRADING MACHINES
(submitted totheCouncil bytheCommission )
COM(75 )573final

SIPLAÎTATORY I®IORAUDUIÎ
•Thisdirective isadoptedinapplication ofArticle100oftheTreatyand
CouncilDirective N°.71/31--)/E3Cof2oJuly1971orL"k*1®approximation ofthe
lawsoftheIlemberStatesrelatingtocommonprovisions forbothmeasuring
instruments andmethodsofmetrological control (l).
Theaimistoremoveexistingtechnical barrierstointra-Community tradein
thecheck-weighing andgradingmachines sectorwhichexistbecauseofdiffe­
rencesbetweenthenational lawsgoverning theseinstruments inthevarious
KemberStates.
Therulesapplicable intheMemberStatestocheck-weighing andgradingmachi­
nesdifferfairlywidely.Thesedifferences arenotlimitedtotechnical
designspecifications butalsoconcernthedegreeofprecision required and
thecontroltechniques towhichtheseweighing machines mustbesubjected before
beingputonthemarket.
Atthetradinglevelsimilarsituaticnsarise fromthefactthatmanufacturers
areobligedtodiversify theirproduction totakeintoaccountthelawsinforce
intheIlemberStatewheretheweighing machines aretobeusedrandthefact
thattheyhavetoundergorepeated checkscarriedoutinaccordance withdiffe­
ringprocedures . '
Astheexistingnational lawsarejustified byalegitimate wishtoprotect
consumers andusers,theonlypossible methodofremoving theinconvenience
resulting fromdivergences between thelawswouldappeartobetheharmoni­
zationofthoselawsandthecreation oftheconditions necessary forestablis­
hingtheCommonMarket. 1
Theterm"weighing andgradingmachines "coversinstruments whichcan '
-withoutthehelpofanoperator-divideupagroupofarticles ,alsocal­
led"loads",intoseveralsubgroups according totherespective weightsof
thesearticles .
Thereareseveraltypesof"weighing andgradingmachine";ofthese,the
check-weighing andgradingmachinedividesuparticlestheweightsofwhich
varyoneithersideofapredetermined valuecalledthenominalweight.
(l)OJoftheEuropean Communities H°,L202of6September 1971*

-2-
i
■-#acck-weighingmachinesareused,.chiefly fillingandprepackaging works.
Theyareusedattheendoftheprocesstocheckwhethereachprepackaged
lotcomplieswiththeappropriate nominalquantityandwhereitdoesnot,
toeliminate anylotwhoseweightorvolumefallsshortofthisnominal
value.
Thisapplication illustrates howimportant theinstrument isbothforthepro­
ducerorpacker -."1andfortheendconsumer .
Tosomeextent,correctprepackaging ofproducts putonthemarketdepends
ontheprecision ofthistypeofweighing machine.
Thisdraftdirective therefore actsasacomplement toDirectives onprepac-
kagingsubmitted earlierand,together withthen,formsacorpuswhichcannot
butbebeneficial totheconsumer.
Inaddition ,atthesametimeasbringing aboutharmonization betweenthe
different national lawsconcerning thesomachines ,thedirective wouldmake
itpossible forthemtocirculate freelywithintheCommunity ;atpresent
thisisnotthecase.
Defining Community procedures onpatternapproval andinitialverification for
theseweighing machines ,andtheconcomitant reciprocal recognition ofcontrols ,
wouldsimplify theformalities whichproducers andoustomers havetoundergo.
Thisdirective wouldmeanonemoremeasuring instruments sectorharmonized at
Community level.
CONSULTATIONOFPARLLTOT TANDTHEECONOMIC ANDSOCIALCOUHTEE
Pursuanttotheprovisions ofthesecond paragraph ofArticle100ofthe
Treaty,thesetwobodiesmustbeconsulted .Implementation oftheprovisions
ofthedirective would,inthecaseofsomeIlcmberStates,requireamendments
totheirlaws.

PROPOSAL J?ORACOUNCIL DIH3CTIVID
ontheapproximation ofthelawsof^theMember,States
relating toCHECK-WEIGHING ANDGRADING MACHINES
(submitted by'theCommission totheCouncil)
THECOUNCIL OPTHEEUROPEAN COMUNITIES ,
HavingregardtotheTreatyestablishing theEuropean Economic Community ,
andinparticular Article100-thereof,
Havingregardtotheproposal fromthoCommission ,
HavingregardtotheOpinionoftheEuropean Parliament ,
HavingregardtotheOpinionoftheEconomic andSocialCommittee ,
VJhereasinthevarious MemberStatesconstruction andtestingmethodsfor
check-ireighingandgradingmachines aresubjecttomandatory provisions
whichdifferfromoneIlemberStatetothenextandtherefore hindertrade
intheseinstruments jwhereasitistherefore necessary toalignthesepro­
visions,
I'JhereastheCouncilDirective of26July1971ontheapproximation ofthelaws
oftheMemberStatesrelating tocomra6nprovisions forbothmeasuring instru--
mentsanamethodsofmetrological control(l)definestheprocedures forEEC
patternapproval andESCinitialverification ;whereas -,inaccordance with
thisDirective ,itwouldbeappropriate todrawuptechnical designandope­
ratingspecifications withwhichthesecheck-weighing andgradingmachines
havetocomplyiftheyaretobeimported,marketed andfreelyusedafter
undergoing testsandhavingthorelevant marksandsignsaffixed,
Whereas,theabovementioned Directive alsostatesthat,wheretheconditions
allow,theseparatedirectives mayspecifythedatebywhicheachMemberState
shallannulthenationalprovisions applicable toinstruments similartothose
whichcomplywiththeCommunity provisions fwhereasinthiscaseitisnot
yetpermissible tofixsuchadate.
HASADOPTED THISDIRECTIVE :
(1)0JofEuropean Communities N°.L202of6September 1971

Article 1
ThisDirectiveshallapplytocheck-weighing and'gradingmachines.These
instruments aredefinedinpoint1oftheAnnex. »
.Article 2
Check-weighing andgradingmachinesforwhichEECsignsandmarksmaybe
issuedaredescribed intheAnnex.TheyshellbesubjecttoEECpatternappro­
valandEECinitialverification , '
Article 3
NoMemberStatemayprevent,prohibit orrestricttheplacingonthemarket
ofentryintoserviceofcheck-weighing andgradingmachines bearingthe"sign
certifying EECpatternapproval orthemarkcertifying EECinitialverification
forreasonsconnected withtheirmetrological characteristics .
' "Article 4 .•■
v
1.MemberStatesshall -putintoforcethelaws,regulations andadministrative
provisions neededinordertocomplywiththisDireotive withineighteen '
monthsofitsnotification andshallforthwith informtheCommission the­
reof. •• .•'
2.MemberStatesshallcommunicate tothaCoouniEsion .thetextoftheprovisions
ofnational lawwhichthey.-adoptiivthfefi&ld«ovorod "
i->jj.C
Artide 5
ThisDirective isaddressed totheMemberStates.
\
DoneatErussols, v
FortheCouncil
ThePresident

r'' i•;•'
General considérations
1,Generaldefinition
Aweighing andgradingmachinedividesup,withoutthehelpofanoperator,
agroupofarticles,alsocalled"loads",intoseveralsub-groups according
totherespective weightsofthesearticles.Adistinction ismadebetween *;
gradingandchecking machines andgradingandclassifying machines :
-agradingand.checking machinedividesuparticlestheweightsofwhich
varyoneithersideofapredetermined valuecalledthenominalweight.
Thefunction ofthegradingmachineistodividethearticles intotwo
ormoresub-groups according ■tothevalueofthedifference betweentheir
'weightandthenominalweight;
-agradingandclassifying machinedividesarticlesofdifferent weights
forwhichthereisnopredetermined nominalweight.Thefunction ofthe
gradingmachineistoclassifythearticlesintoseveralsub-groups ,each
characterized byafixedweightrange. *
ThisDirective onlyconcerns checkweighing andgradingmachines.
2.Terminolory
2.1-Classification ofmachines
2.1„1.according totheir ,methodofoperation :
-weighing andgradingmachines withcontinous movement oftheloads,
or"coni?inxiQt ^gradingmachines ":themovement oftheloadsoiito
theloadreceptoriscontinuous andtheweightinformation is
accfuired duringthismovement ; ."
-weighing andgradingmachines withdiscontinuous movement ofthe
loads,or"discontinuous gradingmachines "jthemovementofthe
loadsontotheloadreceptorisdiscontinuous andtheweightin­
formation isacquired whentheloadisatrest.
2.1.2.'according totheirmethodofgrading :
Thegrading maytaketheformofs
-theappearance ofphysically distinct sub-groups leavingthemachine j
-thecountingofthesesub-groups bymeterswithoutanyphysical sepa«-
ration :

–thestamping oneachload,ofadistinctive markforthesubgroup
towhichitbelongs ;
-severaloftheoperations mentioned above.
Component equipment •;-
Measuring train'• *• *
IJeighcell .' i
Non-automatic weighing instrument orpartthereofdesignedto
supplyinformation relating totheweightoftheloadstobegra­
ded.
Itconsistsofaloadreceptor,aload-balancing devicetohichmaybeautomatic non««sai<praatic and^oesibly .^,4.rwijirC daviQS .,
choitfing-'cit<hcJr^fahe >.srcisDofthsdDnd^t^ight -or,.*£»diffea,iiacec-l^-:!
mjonrife-.andairotfxircncc value*inunitsofweight.
Tripping device "
Devicethatgivestheordertoacquireweightinformation .
Processing transducer v•/.
Adevicewhichconverts thedatafromtheweighing -unitintoan"
electrical orothersignalandprocesses thissignaltogivea
gradingorder.'
Grading -indicator ;
Adevicewhichgivesatleastoneofthefollowing itemsofinfor­
mation s •
-theweightofthe-gradedload;j ■
-thedifference betweenthisweightandareference value;
-thesub-group towhichthegradedloadbelongs.
"• V*
LoadConveyor
Devicedesignedtoenabletheloadstobemovedontotheload
recepter.Itmay-formpartoftheweighcell.

-3-
2,2.3.Presetting î)evioe
Deviceforfixingtheweightlimitsoftheloadsub-groups .
2.2.4.GradingDevice
Devicebywhich,whereappropriate ,theloadsaredividedintophy­
sicallyseparate sub-groups ..
2.2.5.ZeroingDevice
Devicewhichautomatically corrects ,inthelightofthegrading
results,thesettingofthemachinemaking -uptheloadsupstream
fromthegradingmachine.
2.2.6.Counters . <
Devicesindicating thenumberofloadswhichhavemovedontothe
loadreceptor (movementcounter)orindicating thenumberofthe
loadsineachofthesub-groups (divisioncounters),
2,3»Gradingcharacteristics
2.3.1.GradingReference Setting
Valueexpressed as^aunitofweight,setbytheoperator bymeansof
thepresetting device,inordertoestablish thelimitbetweentwo
consecutive loadsub-groups .
2.3.2.•GradingPoint
Valueinunitofweightinrespectofwhichtwodifferent grading
decisions maybetaken,eachhavingthesameprobability .
2.3.3...GradingRange . _
Weightinterval withinwhichthegradingreference settings canbe
adjusted foragivennominalweight -valueoftheloads.
2.3.4.GradingInterval '
Range,expressed inunitsofweightbetweentwoconsecutive grading
reference settings. * '

-4-
2.3.5.GradingError
Difference betweenthevalueofthogradingreference sotting'andthatofthegradingpoint.
*
2.3.6,WeightCategory
ngradingreference settingsdividethewholerangeofweightsfrom
zerotoinfinityinto(n+l)weightcategories consisting ofload
sub-groups .
2.3.7.Drift -
variation inthevalueofthegradingpointperunitoftime.
2.3.3.ZoneofIndécision
Extent,expressed inunitsofweight,ofthezonewithinwhichthe
machine maymaketwodifferent decisions inrespectofthesame
load.
2.3.9.Conventions !Zone.ofIndécision
Zoneinwhichthesmallest ratioofdistribution ofthesameload
intwooonsecutive sub-groups isgreaterthanorecjualto0,1
2.3.10.GradingRate
Numberofloadsgradedperunitoftime.
2.3.11.LoadLength
Sizeoftheload <asmeasuredinthedirection inwhichitismoving.
2.3.12.Weighing Time . .
Timeelapsedbetweenthemomentwhentheloadiscompletely onthe
loadreceptor andthemomentofacquisition oftheweightinformation .
2.4.Metrological characteristics
2.4.1.MaximumCapacity (Max)
Thedesignvalueofthemaximumweightoftheloadwhichcanbegra­
dedundernormalconditions .

-5-
2,4*2,NominalZoneofIndécision (u)
Valueof-thezoneofindecision ,expressed inaunitofweight,
whichischaracteristic ofthemachine,fixedbythemanufacturer
andshownonthemachine.■
2.4.3.Response Time
Timeelapsedbetweenthemomentwhentheloadiscompletely onthe
loadreceptor anathatfollowing whichtheinstantaneous response
oftheweighcelldiffersfromthefinalresponse byacjuantity
constantly lessthan0.5U.
2.4.4.ScaleDivisionoftheWeighcell ' .
Ifthoweighcellhasanindicating device,itsactualorconven­
tionalscaleanditsverification scaleshallbespecified inaccor­
dancewiththeAnnextoDirective N°.73/36o/EECrelatingtonon­
,automatic weighing machines.
3.Definition ofthevariousmachineprecision classes–i-IMI»ma–––» ioWIKA–■– MI >É'inaimiT-IHIINEIU *fu*
Themachines aredividedintothroeclasses,according totheirmaximum
capacity andtheirnominal zoneofindecision .
Theclassisdetermined bytheratioofthenominalzoneofindecision to
themaximumcapacity : • ,•
Class0.051U 1
Max■^1000
1 ...u
1000 Max
1 υ
250^MaxClass0.2:ljJ(X)Max^250
1^U 1Class1 ■■■j-<--T 1■«Cr^r-
«I

CHAPTERII
PROVISIONS CONCERNING THEOPERATION OPTHEMACHINES
4.Metrological requirements
4.1.MinimumValueofaGradingInterval
Thisvalueisequaltotwicethevalueofthenominal zoneofinde­
cisionU.
5,Maximumpermissible errors
5.1,OninitialVérification
■" ' \
5»1«1«Weighoeil
Wientheweighcellhasitsownindicating deviceitisanon-
automatic weighingmachineforthepurposesofDirective N°,73/360/EEC
andmustfulfiltherequirements relating tothemaximumpermissi­
bleerrorsinherentinit.andascertained throughstatictests.
5,1,2,Zoneofindécision
Thezoneofindecision determined duringtestscarriedoutinaccor­
dancewiththisAnnexshallnotexceed0,8timesthenominal zona
ofindecision ,
5»1»3,GradingError
Thegradingerrorshallnotexceed0.8timesthenominalzoneof
indecision .
5,2,InService
5,2,1,Weighcell
Whentheweighcellhasitsownindicating device,itisregarded
asanon--automatio weighing machineforthepurposesofDirective
N°,73/36C/te:Candmustfulfiltherequirements relatingtothemaxi­
mumpermissible errorsinherentinitandascertained throughstatic
tests.

-7-
5,2,2,•Zoneofindécision
Thezoneofindecision determined duringtestscarriedoutinaccor­
dancewiththisAnnexshallnotexceedthenominal zoneofindecision ,
5«2,3,Gradingerror
Thegradingerrorshallnotexceedthenominal zoneofindecision .
6,Conditions fortheapplication ofthemaximumpermissible errors
6,1,NormalConditions ofUse
6.1.1.Weightofloads
Theweightofthegradedloadsshallbelessthanorequaltothe
maximumcapacity ofthemachine,
6.1.2.Weighing time
••Thismustbegreaterthanorequaltotheresponse time,andless
thanorequaltothetimeduringwhichtheloadiscompletely onthe
loadreceptor.
Accordingly ,forloadsofagivenlength,thereisamaxiraunconveyor
speedand.amaximumgradingrateabovewhichthenormalconditions
ofusearenolongerfulfilled .
Forallspeedslessthanorequaltothemaximumspeed,theerrors
andthegoneofindecision shallremainlessthanorequaltothe
valuesspecified inpoint5*
6,2,Influence Factors
6,2,1,Powersupply
Variations inthevoltageofthepowersupplysourcerangingfrom
+lOfoto-15$ofitsnominalvalueandfrequencyvariations of
+2%ofthenominalvalueshallnotcausethegradingpointvalues
tovarybymorethan0.5timesthenominalzoneofindecision .

Ambienttemperature
Iftheidentification plateoarriesnoparticular specification ,
themaohinesshallmeettherequirements ofitems%1,2,and*
5«2,2,between-10®and440*0andtheretirements ofitems
5«1»3«and5»2«3»withinarangeofplusorminusx°Coneither
sideofanyambienttemperature atthetimeofadjustment ,ranging
between 0®Cand30°C#
i
Machinesforwhichaspecific temperattirerangeofatleast30°Gis
givenontheidentification plateshallmeettheabovementioned
requirements onlywithinthelimitsofthisrange.
However,whentheidentification platespecifies thatthemachine
mustbeoperatedinanair-conditioned atmosphere thetemperature
rangemaybereducedto10°C,
Theseprovisions applytostabilized temperatures andtofluctua­
tionsinambienttemperature notexceeding 5°Cperhour.
Tilting
Thisrelatesonlytomachines whicharenotpermanently fixedto
oneplaice.Inrelationtoitsreference settingposition,a
machineshallmeetth:requirements ofPoint5whentiltedlongi­
tudinally ortransversely inaslopeofup-to2perthousand.
Otherfactorsofinfluence
Themachinesshallbeproteoted asfarasnecessary inorderto
satisfytheprovisions ofSection 5»if»innormalconditions of
use,theyareaffectedbyotherfactorsofinfluence suchas
magneticfield,electrostatio force,vibrations ,atmospheric con­
ditions,restraints andmechanical stresses.

CHAPTER III '
PROVISIONS CONCERNING THE CONSTRUCTION OFMACHINES
Suitability foruse
Machines shall hesodesigned that they meet thepurpose forwhich
they areintended andshall heofcareful androbust construction .
Reliability
Machines shall besoconstructed that amaladjustment oroperational
failure cannot normally occur without theeffect ofthemaladjustment
orfailure being clearly perceptible .
Oscillation damper
Iftheeffectiveness oftheoscillation dampers depends ontempera­
ture thoy shall befitted with anautomatic regulating device .If
this device draws upon asource ofpower thausing ofsuch power
must beclearly signalled .Thedamper regulating device must notbe
directly accessible totheuser .
Convoyor
Iftheconveyor comprises abelt ,tapes orchains intended topass
theloads ontotheload receptor andifthetension ofthese belts ,
tapes orchains oanaffect theweight information received bythe
weigh cell itmust notbepossible fortheuser diroctly tooperate
thedevice forregulating thetension .
Levelling device level indicator
Machines towhich item .6,2,3 ,applies shall have alevelling
device andalevel indicator fastened tothemachine insuch away
that they cannot beremoved .
Operation oftheload-balancer andpresetting device
Itmust bepossible tomanipulate thecontrol devices both ofthe
load-balancer andofthepresetting device ,unladen orladen according
tothetype ofmachine ,towithin atleast aquarter ofthenominal
zone ofindecision .

Weight-Indicating devices
Indicating devicesgraduated inunitsofweightsliallsatisfythe
requirements laiddownforweightindicating devicesonthenon-
automatic weighingmachinesreferredtoinDirective N°,J3/360/EEC,
Detachable weights'and"Balancing weiphts"
Thedetachable weightsusedwiththecheckgradingmachines must "be
inconformity withtheSECDirectives N®«Jl/ilJandN®«74/148,their
accuracyclassbeingthatappropriate totheclassof'thegrading
machine.' '
When,fromatechnical pointofview,itisabsolutely .neoessary ,these
weights maybereplaced by"balancing weights"whichmeetthefollo­
wingrequirements : .
-theshapemustbedifferent fromthatofthedetachable "weights ;
-theymustbearthefollowing indications »numberpfthegrading
maohineandconventional identification oftheweight.
Identification
Machines mustbearthefollowing data,intheordergivent
Dataexpressed inplainlanguage :
-identification ofthemanufacturer :
ifapplicable ,identification oftheimporter ;
-yearandnumberofmanufacture ;
-identification mark-oneachcomponent ofMachines oomprising separate
connected components .
Dataexpressed inoodes
-EECpatternapproval mark{ '
-accuracyclassinthefollowing formt
forclass0.05*CL0,05
forclass0.2tCL0.2
forclass1*CL1

-maximumoapacity,in-the-following' form:Max.....
-nominal zoneofindécision .
inthefollowing form: U»,«.«,
-response time,inthefollowing : 't<*•••••
-whereappropriate ,accuracyolassandscaleinterval ofthe
weighcell,intheformprovidedforinDirective N°,73/360EEC}
-ifnecessary ,anindication ofthetemperature range,aslaid
downinitem.6.2,2.,inthefollowing form:...°C/.°G;
-voltageandfrequency oftheelectricity supplycircuit,inthe
following forms.....V
•••••H
7*9*3*Otherdata'
DataotherthanthoselaiddowninthisAnnexmayberequired or
authorized byEECpatternapproval.
7*9*4*Appearance ofidentification data
Identification datamustbeindelible andbeofsuchsize,shape
andclarityastobeeasilylegible.
Theymustbearranged onanidentification platefixedinaclearly
visiblemannerclosetotheadjustment controls.
Itmustbepossible tosealthemounting forthedataexceptifit
issuchthatitwouldbedestroyed byremoval. •

CHAPrER IV
^ .'• tf v..-.i-,,••''•.
EECPATTERN APPROVAL
EECpatternapproval ofcheckgradingmachinesshallbecarriedoutinaccor­
dancewith"therequirements ofCouncilDirective N°.71/316/EDCof26July
1971ontheapproximation ofthelawsoftheMemberStatesrelating tocom­
monprovisions forbothmeasuring instruments andmethodsofmetrological
control,•Certain6ftheserequirements arespecified in-thisChapter,
8,Application forpettéraapprovai " '*
.V1 * »■' . .
Theapplication forE3Gpatternapprovalshallcomprisethefollowing infor­
mationandspecialdocuments t
fS »*
8,1,Characteristics •„,,
-someofthedataspecified initsn7,9,s
Γ"ί.1'
-forcontinuous gradingmachines,tableshowingthemaximumopera­
tingratesinkeepingwiththeconveyor-belt speedandtheload
length;
-electrical characteristics ofthemeasuring 7traincomponent *
8,2,'Descriptive documents '
Theseshallincludeschematic diagrams enablingtheworkingofthe
machinetobeeasilyunderstood ,diagramsofel^ctrioal circuits
relatingtosupply,pick-upandmeasurement ,andphotographs ,
9,Limited' EECpatternapproval
Limited EECpatternapprovaldecisions maybemade,afterpriorconsulta­
tionwiththeotherMemberStates,inordertopermittheperformance of
teststindernormalconditions ofuse.
Thevalidityofthesedecisionsshallbolimitedtofiveyearsatthe
mostandtheplacesofinstallation ofthemachinesmustbenotifiedtothe
competent authorities .

-13-
s ~'■
10,Examination forEECpatternapproval
10.1,Placeoftesting
Machines beingconsidered forapproval maybeinstalled :
-eitheronthepremises oftheMetrology Servicewithwhichthe
application hasbeenlodgedj
-orinanyplacejudgedsuitable byagreement betweentheMetrology
Serviceconcerned andtheapplicant.
10.2,Provision ofthemeansofchecking
Themeansofchecking whichtheMetrology -Servicemayrequirefroci .Jhe
applicant arethetestloads,themeansofhandling andthequalified
staffwhichtheperformance ofthetestsdemandsandtherequisite
checking instruments ,
10.3,Checking thattheconstruction complies withlegalrequirements
Machinesshallmeettheconstruction requirements specified inChap­
terIII.
10.4,EECpatternapprovaltests
Machines whichmaybearseveralgradingreference settingsshallbe
submitted fortestingwithatleasttwogradingreference settings.
Intheutilization zonethemachines shallmeettheoperating requi­
rementsspecified inChapterII,Theoperational testsshalltake
intoaccounttheconditions forusespecific tothemachines tested.
10,4,1,Statictests
10,4«1«1 »Testswitheccentric loads
4
Underaloadequaltoonethirdofthemaximumcapacity,theextreme
difference betweenthevaluesofthestandard weightscorresponding
totheequilibrium position whentheseweightsareplacedonany
different pointsontheloadreceptorshallnot.exceed0,5U,

-14-
Î-»î
10.4»1»2,Specialtestsformaohinestheweighcellofwhichisaself-
oontained non-automatic weighing machine
,τ,^.·ι.....ψ,..··.<·_,·· ··-./... ,»Α .·...*··.*
Thenon-automatic weighing machineshallundergothe.sensitivity ,.motilityandaccuracytestsspecifiedinDirective "N°.73/360/EEC
of19November 1973» ,■- < • \
Thepermissible readingerrorsshallbe,thesameasthosefornon-
automatic weighing machines inkeepingwiththeirscaledivision and
accuracy class.
10.4.1.3# Variation ofthegradingpointundertheeffectofinfluence factors
Thepurposeofthesetestsis.todetermine statically thevariation
ofthegradingpointsfordifferent loadsnotgreaterthanthemaxi­
mumoapacity.undertheeffectofthevarious .influence factors
listedinitem6.2.
Thevariations obtained undertheeffectofeachinfluence factor
mustbecompatible withtheprovisions ofitem6.2,
10.4«2.'Measurement of'Response time' 1■---•• •
Theresponse timeshallbemeasured underconditions fraeofinfluence
factors.Thevaluesobtained mustbelessthanorequaltothevalue
shownontheidentification plate. ,.
Thedatareferredtoinitem ,8.1.concerning themaximumoperating
ratesasafunction ofthebeltspeedandtheloadlengthmustbe
'compatible withthevaluesobtainedfortheresponse time.
10,4.3.:Testsundernormalconditions ofuse
10.4«3«1 «Zoneofindecision andgradingerror ♦
Thetests,undernormalconditions ofuse,shallbecarriedoutintaccordance withthemethoddescribedinitem12.3«1»(Reference
''■method)jwiththemachineoperatingeitheronaproduction lineoron
aloadcircuitsimulating aproduction line,thetestloads,of
variousweights -aboveandbelowameanvalue,beingthemselves quite
numerous .-.. -..

-15-
10.4«3»2.Driftofthegradingpoirit
Thesetests',carried ,outwithloadsofthesamenominalweightwithout
alteringthemachinesettings andwithoutvaryingthefactorsof
influence ,shallberepeated severaltimesduringaperiodofatleast
eighthours*Thegradingerrorsmustconformtotheprovisions of
item5,lo3»withoutthedifference betweentheextremevalues
exceeding 0.5 i■ -
10.5,BEGpatternapprovaltestreport
TheEECpatternapprovaltestreportshallincludetheresultsofthe
testsspecified initem10.4#andanyrelevant dataarisingfrom
thevarioustests,especially fromthoseontheoperating safetyde­
vices.
Initsconclusion ,thereportshalloontainanopinionfororagainst
EECpatternapproval.
10,6.Specialconditions required byEECpatternapprovai
WhenEECpatternapprovalrequires themachinestooomplywithspecial
conditions ,thesemustbeshownonthepatternapprovalcertificate .

-16-
CHAPTER V
EECINITIAL VERIFICATION
EECinitialverification ofweighing andgradingmachines shallbecarried
outinaccordance withtherequirements ofCouncilDirective Ne.7-/316/EEC
of26July1971ontheapproximation ofthelawsoftheMemberStatesrela­
tingtocommonprovisions forbothmeasuring instruments andmethodsofmetro­
logicalcontrol.
Theserequirements shallbesupplemented andrenderedspecific bythefollo­
wingspecialprovisions t
11.PlaceofEECinitialvérification
EECinitialverification shallbecarriedoutintwostages:
Firststage-atthechoiceoftheMetrology Serviceconcerned }
attheverification officeor
onthepremises ofthemanufacturer orhisagentorattheplaceof
installation .
Thesecondstageshallbeaccomplished attheplaceofinstallation by
thecompetent localMetrology Service.
12.Methodsoftesting
12.1.Provision ofmeansoftesting
Thematerial meanswhichthemetrology service maydemandfromthe
applicant are,inparticular :thetestloads,thehandlingequip­
mentandqualifiedstaffrequiredtoperformthetests,andthe
requisite testinginstruments ,
12,2,Testsduringthefirststage
Thesetestsarethestatictestsspecified initem10.4«1 *
12.3•Testsduringthesecondstage
Thesetestsmaybecarriedouteitherbyoneofthemethodshereinaf­terdescribed orbyanyothermethodofferingequivalent security.

-17-
Reference method (seaitem ^14.2.)
V. .V ■*' •
Inrespect ofthenominal setpoint themachine shall becaused
tocheck test weights at7points spanning thezone ofindecision .
Assuming that the approximate values ofthesetpoint andofthe zone
ofindecision arealready known oraredetermioed "bymeans ofpreli­
minary tests ,themass ofthetest weights tobeused isobtained as
follows i
y=»A+I0645 .g-g3A+1,282 ^A+0.84-2 m^»A
wheret
A« B-H-L
HandLaretheapproximate values ofthemass atthelimits ofthe
zone ofindecision .
The test weights shall besimilar inshape tothearticles which the
machine isdesigned tocheokweigh .
Each test weight shall bepassed over themachine 50times ,except
inthecase ofthetwo (2)lightest andtwoheaviest weights ,
which shall bepassed 200times each®
Thetest weights shall bepassed inrandom order *However ,thetest
-y weights attheopposite extremes ofthezone ofindecision should fol­
loweach other consecutively ,separated byatime interval which cor­
responds tothemaximum rate ofcheckweighing .
Theresults logged forthevarious tests shall besetoutinatable
asshowtt under item 14»2 ,From these results itwill bepossible
tocalculate the zone ofindecision andthe setpoint inthepres­
.cribed manner .
12,3,2 ,Method A
Aload isemployed theweight ofwhich isequal totheminimum desi­
red load , '
Adjust the "minimum "operating reference setting sothat a"minimum
signal always appears during "n"weighings .
Make certain that when theload inincreased byavalue approximate­
lyonetenth ofthenominal zone ofindecision the "normal "signal
appears atleast once during "n"weighings .
Continue thetest byincreasing thetest load bylowvalues until the
"normal "signal isobtained constantly inthecourse of"n"weighings .
Thedifference between the twoextreme values found isanestimate of
thezone ofindecision ,thedifference between thegrading reference
setting andthemiddle ofthis zone being theestimate ofthegrading
error .

-18-
12.3,3.MethodB(seeitem 14.3.)
Ifthemachinehasatleasttwogradingreference settings both
mustbeadjusteduntil-aloaddistribution inthethreeweightcate­
goriesisobtained ,thegradinginterval beingapproximately 1,5.
to3timesthenominal zoneofindecision .
V. • •
Oncethemachineisworkingnormally,separate fromtheotherloads
thefirst200loadsclassedintheabovement ionedgradinginterval,
weighthemonasuitable checking instrument ,eliminate thetwo
;extremevaluesfoundandnotethepenultimate values.
Thediscrepancy betweenthedifference betweenthepenultimate values
andthegradingintervalisanestimate ofthezoneofindecision }
halfthesumofthepenultimate valuesminushalfthesumofthe
gradingreference settingsistheestimate ofthegradingerror.
Ifthemachinehasonlyonegradingreference setting,adjustitsoas
toobtainavirtually equaldistribution betweenthetwocategories .
Weighthefirst200loadsofeaohcategory,notingthepenultimate
values,theheaviestofthelightcategory andthelightestofthe
heavycategory }thedifference betweenthesetwovaluesisthe
estimateofthezoneofindecision ,theestimated gradingpointbeing
equaltohalfthesumofthesetwovalues.
12,3.4»MethodC(sceitem14,4o)
.Thisisderivedfrommethod Aandrequirescalculation ,butitpresup­
posesthatthedistributions aroundagradingpointobeythenormal
law,.
Adjustthetestloadtoavaluex^suchthata"minimum"signal
appearsalmostconstantly andthe"normal"signalappearsonlyk^
times,beingverysmallcomparedwiththenumber"N"oftimesthis
loadpassesamongtheothersofthebatchtobeohecked.
„ *« •
Thetestloadshallthenbeadjustedtoavaluex^suchthatkg^the
numberoftimeswhenthe"normal"signalappears,approximates very
closelyto"N",thenumberoftimestheloadpasses.

-19-
Astheratios and arerespectively equaltoP.%and
N N
P^fthetablesofthenormallawmakethereducednormalvariables
u^andu2correspond,toandP2#• ■*
Nowua– ■andknowledgeofthevaluesx^,^u2Sivss
thevaluesform(gradingpoint)and<j-(standarddeviation o'fthe
zoneofindecision )^WhereN=»100£?"and mcanhesatisfactorily
determined .
\

-20-
CHAPTER VI
IN-SERVICE VERIFICATION
13».In-Service tests
In-service checks shall "bemade under the Same conditions asthe second -
stage tests oftheinitial verification andcarried outunder normal con­
ditions ofuse,themaximum permissible errors provided forinitem
5«2»"being applied .

-21-
CHAPTER VTI
ZONE OFINÏÏECISrjS
theloads aredistributed inarandom fashion around agrading
point ,experience shows that thezone ofindecision does nothave
precise bounderies and itisthus necessary totake asavalue for
this zone thedifference between thetwoloads ,thesmallest ratio of
distribution ofwhich ineach ofthesub-groups islower than ade­
termined percentage which isthesame foreach oftheloads .
Therefore the zone ofindecision could bedefined asfollows t
The zone ofindecision isthe zone inwhich the smallest ratio of
distribution ofagiven load J.atwoconsecutive sub-groups isgrea­
terthan orequal to–-
2
14.2, RETTÎH3NCE METHOD
Procedure inlogging thetest results andcalculating the zone of
ih&é£Î£ion^and^the setpoint .
IIisthemass ofthetest weight towhich incremental masses x.areο ι
added .Ifaparticular testmass (Mq+x^)ispassed overthemachine
n.times andisaocepted r.times ,then r./n.will vary from 0to1i i ' î'i
asivaries from 1tok,kisthus the number ofdifferent test mas­
seswhich areused tospan thezone ofindecision (iefrom ia
2toiak-1,0<^z\ /n^<^l).
Thetestresult values of r^andn^areentered intothetable below 0
Thevalues fornwandnwyarefound from tables 2and3forna50and
na200respectively .
2Thevalues ofn.w.x .n.w.x .andn.w.x.y .arethen calculated andill ,ill iii^i
columns 5»6f7i8and9aresummed togive respectively
\n.w .,\n.w.y .t\n.w.x .,Nn.w.x .^n.w.x.y .,/_Ii1/i11x*lii*/i_a.i/iliJi*
i=l i=l

-22-
ТАЧГ.Д 1
«манаймим
Col.1Col.2Col.3Col.4Col.5Col.6 Col.7 Col.8 Col.9
!
Xn Γi nw nwy nwx2
nwx nwxy
h 11 ηWiΥπ nlwl1ViVi
Iιi
• ii
•i
*
X.
1n.ir.
xi n.w.iin.w.y .îixn.w.x .îii2n.w.x .:.ii1♦
n.w.x .y.1111
• i
I
*k rkk♦
Vk
I 1Wk
\WkWk YkVk
i
ii
k
1
Ik
&Vi
»1k
Ση.ν/.χ._ιιι
1k2avi
ik
\n.w.x.y .viiiJi
1
Thefollowingquantities arecalculated ,fromthesummations giveninTable1."
n.w.x .
.111
XV1■n.w.>_ii
n.w.y ..1l"7!
y«vn.w.^–ii
S(nwxx) n.w.x .
•iii(\n.x.x.).–iii'
n.w.
.li
S(nwxy) Vn.w.x.y .2iiii(\n.w.x.)-–ili7
n.w.–ii
and S(nwxy)Slnwxxl

-23-
Then theestimate Mofthesetpoint Misgiven "by
A A A ^ 1–
M«M+mwherem »x-ryo D
Theestimate V(m)ofthevariance offtisgiven "by
V(m)=lЪ2-2
У
<r–n.w . .2 ii bS(nwxx )
Theestimate Zofthezone ofindecision Zisgiven "by
z--2-
.2=-r •
^4% A
Theestimate ?(?) ofthevariance ofZisgiven by
V(Z)=36
bS(nvooc )
Theinterval ofoonfidenoe at100(l–)$whioh straddles thetruevalue
ofthecharacteristic ,inother words tSIinterval forwhioh theprobability'
that itstraddJ <=■«thetrue value isatleast (l–),isobtained byapplying
C2Tchebyoheff *sinequality which states that
»I•<< I',■ ■:, ■* V) •1-7.2
Where Cischosen togive therequired minimum probability
Eistheestimate ofthevalue ofthecharacteristic obtained from the .,
test data '
Tisthe true value ofthe characteristic
Visthevariance ofthe estimate Eobtained from thetest data
Using this formula thelimits toadouble-sided 95%oonfidenoe interval onthe
setpoint Mare *»
M-\/20V(m)and M+V20V(m)
andthelimits toad®uble-sided 93$confidence interval onthezone ofindeoision
Zare ,* - >. .
* \!AA /A \/ A.AZ-y20V(2)and .Z+V20V(z)
i '
Thevalues fornw.andnwyareshowon intables 2and3forn-30 n■200
respect iv ■'/"v

TABLE 2 na50 -24-
I ' nwr 1 ■
| r>vnr
fΓ nvr т-лг
H-t–
Inf 3.588 -8.346 '3.5 28.73 / 15.094
5.081 -12.28 ? 36 28.10 /! ; 16.380
? 9.669 -16.928 37 i
i27.3 /12 ♦; 17.591
12.580 -19.559 38 26.492 !I 18.711
15.015 -21.097 39 ! 25.546 !19.726
 
617.111 -21.929 40 2Д./9Л 20.614
18.947 -22.263 41 I 23.325 I 21.351
7 20.574 -22.226 42 22.02 /1 ! 21.902
8 22.024 -21.902 i 43 20.574 22.226
9 23.325 -21.351 j4418.947 |22.263
10 . 24.494 i-20.614 45 17.111 21.929
I11 ! 25.546 -19.726 46 15.015 21.097
12/: 26.492 -18.711 47 12.580 19.559
13 27.342 -17.591 48 9.669 16.928
1428.104 -16.380 49 5.981 12.282
1528.784 -15.094*
50 3.588 8.346
16 29.386 -13.744
17 29.915 -12.339
18! 30.374i-10.888
ιf
19! 30.767 .-9.399
20 31.096 -7.878
21 31.363 -6.332
22 31.569 –4,766
.23 31.715 -3.185
I
24 31.802 -1.595
25 31.831 0«
26 31.802 1.595
27.' 31.715 3.185
28 31.569 4.766!
! •
29 31.363 6.332 4i.•
i
i
30 31.096 7.878i
I
31 30.767 9.399i - -i
32 30.374 | 10.888I
i
i
33 29.915 12.339
i
l34 j29.386 13.744
Thevalues ofnw,and nwyinthis line shoild only beused forthehighest value
ofxwhen r=»oorthelowest value ofxwl«nr«50.

TABLE 3 n»200 -25
0
1
2
3
4
5
6
7
!8
9
10
11
12
13
14
15
16
1?
18
■"19
20
21
22
23
24 •
25
26
27
28
29
30
31
32
33
34
35
36
37
3Sv
39nw1 ~–
} nwy I r
II 'nwnwy
4.831 -13.56O 40 | 97.974 Γ.-82.456
8.406 -21.650 41 99.086 -81,620
14.350 -33.384 42 100.132 *-80.750 J
19.414 -42.128 43 101.170 -79.842 ;J
23.922 -49.128 M 102.182 -78.904
28,028 -54,932 45 103.166 -77.932
31.820 ~59.84 6 46 104.124 -76.932
35.356 -64,052 '47 105.058 -75.902
.38.676 -67.710 48 105.968 -74.844
41.812 -70.890 49 106.852 -73*762
44*788.»73®668 50 107.714 -72.652
47.618 »76.102 51 108.552 -71.518
50.320 -78.23 6 5? 109.368 -70*362
52.906 -80.104 53 110.162 -69,182
55.386 -81.736 54 110,936 -67.982
57.768 -.-83.158 55 I 111.686 -66.762
60„0S8 -84.386 56 112.416 -65.520
62.268 -85.444 57 113.126 ~64.262
64.398 ;
ι-86c342 58 113.814 -62.984
.66.454 -87.094 .i
- i59 114.484 -61.688
6S,âAÛ!-87.714 60 115.134 -60.376
70.368!-88,212
i '61 115.764 ;-59.048
72,232 -88.594 ! .62 | 116.376 -57.704
74.038 -88.872i 63 116.968 !i-56.346
75.788 -89.050 64117.542 -54.974
77.486 -80,138 65 118.0Q8 -53.563
79.136 -89.138 66I 118.636I-52.190
80.733 -89,058 67 119.156 !-50.778
82.294 -88*902 68 119.658 -49.354
.83.806 -88.676 69 120.1 44 -47.920
«5*276 -88.382 70 120.612 -46.474
86.706 -88.024 71 121.062 -45.018
88.096 . -87.608 72 121.496 -43.^2
89./ISO -87.134 73 121.914 -42.076
90.766 –86.606 74 ,122.316 -40.590
92.050 -86.028 j
i75 122.700 -39.098
93.298 -85.402 76
1123.068 -37.596
94.514 -84.728 77' } 123.422 -36.086
95.693 -84.012 78 123.758 -34.568
96.850 -83.254 79 124.07Ô -33.044

TABLE3(oontd.)n-200 -26
Inw nwy Γ nw nvnr
80 12/1.384 -31.512 120 124.384 31.512
81 124.674 -29.974 121 124.073 33.044
82 124.948 -28.432 122 123.758 34.568
83 125.206 -26.882 123 123.422 36.086
84 125.450 -25.328 124 123.068 37.596
85 125.678 -23.768 125 122.700 39.098
86 125.892 -22.040 126 122.316 40.590 .
87 126.090 -20.636 127 121.914 42.076
88 126.274 -19.064 128 .121.496 43.552
89 '126.442 17.488 ,129121.062 45.018
90 126.596 -15.908 130 120.6T2 46.474
91 126.734 -14.326 131 120.144 47.920
92 !126.858 -12.740 132 119.658 49.354
93 126.968 -11.154 133 •119.156 50.778
94 127.062 -9.564 134 118.636 52.190
95 127.142 -7.972 !135 118.098 53.588
96 .127.208 -6.380 |136 117.542 54.974
97 127.258 -4.786 137 116.968 56.346
98 127.294 !L-3.192 138 116.376 57.704
99 127.316 -1.596 139 115.764 59.048
100 127.324 0 140 115.135 60.376
101 127.316 ..1.596 141 ;114.484 61.688
102 127.294 3.192 142 i113.814 62.984
103 127.258 4.786 "143 113.126 64.262
104 127.208 6.380 144 112.416 65.520
105 127.142 7.972 .145 111.686 66.762
106 127.062 9.564 146 110.936 67.982
107 126.963 11.154 147 110.162 69.182
108 126.858 12.7*0 1/18 109.368 70.382
109 ..126.734 14.326 149 108.552 71.518
110 .126.596 15.908 150 107.714 72.652
111 126.442 17.488 151 106.852 73.762
112 126.274 -' 19.064 152 105.968 i74.844
113 126.090 20.636 153 105.058 75.902
114 125.892 22.040 .154 104.124 76.932
115 12S,678 23.768 1*5 103.166 77.932
116!125.450 25.328 156 \102.182 78.904
117 !125.206 26.882 157 101.170 79.842
118 124.948 28.432 158 100.132 80.750
119|124.674 29.974 159 99.086 81.620

TABLE3(contd)n«200 -27
г nwjrivy i
j_„ : i
Γ160 9~,974}82T456 1
1*1 QA.8^0 83.254
162 95.698 8/1.012
163 9/1.514 84.728
1M 93.298 8^.402
!1^5
*92.050 86.028
1бб 90,766 86.606
167 89.450 8?»134
168 88,095 i87.603
169j86,706 88.024
170 8^.276 88.382
171 83.806 88.676
172 82.294 88.902
173 80.738 89.058
174 79*136 89.138
175 77.486 89,138
176■;75.788 89.050
i177 .I74«.038 88.872
178 ii72.232 ;88.594
179 i70.368 i88.212
180 •! ",6'8.44<3 ■!87.714
181 I66,454 87.094
182 Ij64,393 86,342
183 ï62.268î8S.444
184 •6O.O58 '84.386
185 57.768 33.158
186 55.386 81.736
187 52.906 80,104
188 50.320 73.236
189 47.618 -76.102
190 44.788 73.668
191 41.812 70.890
192 38.676 .67.710
193 35.356 64.062
194 31.820 59.846
195 28.028 54.932
196 23.922 49.128
197 19.414 42.128
•198 14.350 33-384
199 8.^06 21.560
200* 4*831 13.560¥Thevaluesofnwandnwyinthis line Bhould
onlybeusedforthehighest valueof1.
whenr■0orthe lowest valueofxwhenr=•"

-28-
НЙГНОО В
Letitbeassumed,therefore,thatapercentage q^ofloadsoutside
thelimitsofthezoneofindeoision whichitisdesiredtodetermine
canbeplacedwithinthiszone,andlet(l-0*^)betheprobability
thatthishypothesis canbeaccepted withouttherebeingaprobabi­
lityjQthatacertainpercentageq^(q^q^)wiUlbeexceeded.
Fromthesevalues(O^jq^-*qg)itispossibletodetermine
thesizenofthesampletobeachieved andtheacceptable number ^o
ofloadswhichmaybeeliminated inordertodetermine thevalue
ofthezoneofindecision .
cnandohavingbeenfixed,themeanpercentage q=–isdetermined
withaoonfidence intervalequalto1- )»Itshouldbe
observedthat,siscandnmustbewholenumbers,thosewhichare
calculated aretobeconsidered asapproximate values.
Assumingthatthepercentage oftheloadsabnormally placedinthe
zoneofindecisionisq^,elimination of"c"extremeloads,corres­
pondingtothemeanpercentage onlyleadstoaresultwith
negativedeviation ,i„e„atthemostequaltothetruevalueofthe
aoneofindecision andtherefore tothenominal zoneofindecision
withwhichitisdesiredtocompareit#
Moreover,asthegradingpointisdefinedasthevalueoftheloads
likelytobeplaced,withaprobability 0f0a5,incneorotherof
thesub-groups whichitseparates ,thehalfsumoftheextremevalues
selected constitutes anestimate whichwillbeproportionately better
wherethegradingreference settingorsettingareclosertothe
meanvalueofthepopulation tobegradedandthesizeofthesample
islarger.
Ifoneselects,q^s»0.002and»0,05inrespectofn=200ando=
2thezoneofindeoision isdetermined withaoonfidence interval
practically equalto0#99(seQtable4)»
Itshouldbeobservedthatthismethodappearstobemoreparticular­
lyapplicable whentheinitialandperiodical verifications arecar­
riedout,i.e,whenitisaquestionofensuringthatthenominalzone
ofindecision isnotsmallerthantheexperimental zoneofindecision ,
thevalueofwhichisonlyaresultwithnegative deviation#14,3,
ч

чTABLE4n»200 -29-
c\0,001 0.002 0.005 0.0083 0.010.0133 0.02 0.05
0.9825 0,9386 0.7358 0,50.4044 0,0908 0,0004
0,9988 0,9921 0,9202 0,6766 0,50,2357 0,0023
Probability offindinginasampleofsize"n"anumberatmostequaltonoNdefective
loadswherethepercentage ofdefective loadsinthebatohis"qw.
14.4.METHOD C
Thismethodappearstobebettersuitedfordetermining thezoneofindeci­
sionsinceitproduoes thestandard deviation ofthedistribution .
Whatismore,itmaybeaooepted whereNislarge,thattheexperimental
standarddeviation nsHapproximately obeysanormallawwithmean(P^~
CT"andstandarddeviation ■twhich -•whenaspeoifioconfidenceV2B
intervalisadoptedenablestheuncertainty ofthemeasurement tobefound.
This,intheoaseofaconfidence interval approximating to0,99the
βlimitsof(y'ares+2.5–7' #roughlytherefore,whereN■100,
Vr»
Thepositionofthegradingpointisdetermined ,intheoaseofthesame
confidence interval,withasimilaruncertainty .