CELEX: 51973PC0597
Language: en
Date: 1973-04-18
Title: PROPOSAL FOR A COUNCIL DIRECTIVE ON THE APPROXIMATION OF THE LAWS OF THE MEMBER STATES RELATING TO CONTINUOUS TOTALISING WEIGHING MACHINES (Submitted to the Council by the Commission)

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COM (73) 597
Vol. 1973/0121
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 ---pagebreak--- COMMISSION GF THB EUS.OEBAN
                                                            COM(73)597 final
                                                            Brussels , 18 April 1973
                      PROPOSAL FOR A COUNCIL DIRECTIVE Oil
              THE APPROXIMATION OP THE LAWS OP THE MEMBER    STATES
             RELATING TO CONTINUOUS TOTALISING WEIGHING MACHETES
                 ( Submitted to the Council "by the Commission)
  COM(73 ) 597 final
 ---pagebreak---                             EXPLANATORY MEMORANDUM
         This Directive is adopted pursuant tc Article 1GO cf the Treaty in
conjunction with the Council Directive of 26 July 1971 on the approximation
of the laws cf the Member States relating tc common previsions for both
measuring instruments and metheds cf metrclcgical control .*
         The present Directive aims at eliminating the technical barriers to
intra-Community trade existing at the present time in the sector of . • . ,
continuous totalising weighirg machines on account cf the disparity between
the national laws governing these machines in the Member States .      t ; >
         A comparison of the regulations applicable to the6e machines in the
various Member States has shown that the differences are not limited only
to the technical specifications relating tc the construction and the
conditions of use , but alsc to the degree cf precision and finally to the .*
inspection procedures to which these machines are subjected before they are
placed on the market end put into use .
      :  The effect of this situation on trade is that the manufacturers have
tc diversify their production in order tc comply with the regulations in
force in each Member State in which these machines are intended to be used .
and have t'6 submit to repeated inspections carried out according to the
different procedures .
         Since the present national laws are grounded on the legitimate desire
to - protect the consumer and the user , harmonization cf these laws appears tc
be the only way to eliminate the inconveniences resulting from their divergence
and to create the Conditions necessary for the establishment of the Common..
Market .            '•
                        ,  ... . .. • -1   m- .
 J.C.' (Journal Officiel ) Official Jcurnal of the European Communities Ho L 202
 cf 6th September 1971 .
 ---pagebreak---                                     - 2 -
       By " continuous totalising weighing machines " are meant machines
which allrw automatic determination of the cumulative weight cf any given
product which is carried on to the weighing machine by means cf a conveyor
belt . This totalising weighing machine is either incorporated in a pre­
existing belt or separated from the main conveyor belt and consists cf a
smaller conveyor belt , which is supported completely by a platfrrm scale
which acts as a continuous totalising weighing machine.
       Continuous totalising weighing machines are used above all in '
conveyor belt tackle for loading or unloading ships , lorries and trucks
or other means of transport for goods in bulk.     These machines make it
possible to determine the full quantity of such goods with sufficient
precision and in a relatively economic way , without loss of time and
without breaking the forward travel of the materials during transport on
the conveyor belt , this transport being in any case indispensable.
       Continuous totalising weighing machines are also used in plants
that mix and process various materials , to monitor the flow of the materials
to be mixed , to keep it constant , or to modify it according to the
manufacturing requirements .
                                »
       Besides the indicators for the totalised quantity transported , the
continuous totalising weighing machines are as a rule fitted with a
flowrate indicator (weight 'of product transported per unit time ). Some . ,
machines are also 1 fitted with other complementary devices , for example ,
a flow-regulating device. ;
       The initial inspection of continuous totalising weighing machines
is carried out in two stages .    In the first stage , the continuous totalising
weighing machine itself ( in the case of weighing machines incorporated in
conveyor belts ) is tested " statically" by means cf standard weights on the .
premises of the manufacturer ( partial inspection). In this case the
conveyor belt travel has to be simulated. The second stage cf the initial
                                                                     • • • / • ••
 ---pagebreak---                                           » r
                                    • 3 -
inspection is effected at the place where the conveyor belt assembly is to
be used , with the material normally tc be transported and with the aid of
a sufficiently large and appropriate control machine (weighbridge fcr
vehicles , bunker scale ).
       Since ccntinuous totalising weighing machines are in practice
indispensable fcr the measuring cf relatively large quantities cf materials
in bulk and their economic importance is growing with the ever-increasing
automation of production , the requirements tc be met at the time cf the
initial inspection must be uniformly established so - that the present
technical barriers to trade which result from the differing national
provisions concerning construction and inspection , can be eliminated and
the initial two-stage inspection can be applicable throughout the entire
Community with all that this implies in regard tc rationalisation of
production , scale economies , and the costs and formalities entailed by the
different inspection procedures under the various national systems .
HARMONIZATION SOLUTION
       The harmonization method chosen is the so-called optional system , on
the pattern of that adopted for the majority cf the special Directives
concerning measuring instruments . The optional harmonization system is
allowed for the same reasons as the total harmonization system by the
Council Directive of 26 July 1971 relating to common provisions for
measuring instruments and fcr metrclogical control methods .   As long as
the bulk cf the non-technical provisions , notably on the sphere cf utilisation
and tc the control dues relating to the continuous totalising weighing machines
have not been harmonized , the total harmonization system would raise serious
problems .
       The optional harmonization system means that ccntinuous totalising
weighing machines which meet the requirements cf the present Directive will
be able to be freely marketed among and used in the Member States in the
same way that machines which have satisfied the national inspection
requirements cf any one of the Member States can be marketed and used in
that State .
                                                                  • • • /• 9 $
 ---pagebreak---                                    .* 4 -
CONSULTATION OF PARLIAMENT AND OF THE ECONOMIC AND SOCIAL COMMITTEE
       Under the terms cf Treaty Article 100(2 ), the opinion of these
two authorities is necessary , since implementation measures required by
the Directive entails , for certain Member States , amendment cf their
legal previsions .
 ---pagebreak---                                   ANNEX TO THE
                             EXPLANATORY MEMORANDUM
                   Laws in fcrce in the Member States relating
                   to continuous totalising weighing machines
EELGIUM
    I7o.:e
    STore
GERMANY
- Law on metrology and inspection of weights and measures              !
    (Le,.? on calibration - Eichgesetz ) cf 11 July 1969 .
- PTE Hequireraents relative tr the construction of continuous totalising
    weighing machines (Bauartanforderungcn an F'drderbandwa$<ai der PTB ).
FRANCE
- Decree of 18 June 1956 modified by Decree of 31 August 1971 .
- Circular No . 71.045.064.0 cf 19 April 1971 relating to continuous
    totalising weighing machines .
 IJjELAÎïD
     ÏTone
'ITALY
- Act consolidating the laws on Weights and Measures approved by Royal
    Decree of 23 August 1890 Nc . 7088 and the subsequent amendments thereto .
- Regulation of 12 June 1902 cn the manufacture c-f weights , measures and
    weighing and measuring instruments and subsequent amendments thereto .
- Decree of the President cf the Republic , Nr . 575 of 22 June 1954 , which
    admits to metrological control automatic machines intended for the
    weighing of materials transported on a continuously moving belt .
 - Ministerial decrees following rn the abr-ve mentioned decree of the
    President of the Republic concerning the admission to metrclogical
     control , at the request of the manufacturers , cf special automatic
    machines intended for the weighing of materials transported on a
     continuously moving belt ( pattern approve !) .
 LUXEMBOURG
    Ncne .
 ---pagebreak--- THE NETHERLANDS
 - Law on the testing and inspection of measuring instruments    ( ijkwet ) 1937 .
 - Explicit requirements : the weighing machines used in commerce must be
   inspected and stamped ,
 - Regulations relating tc inspection cf measuring instruments ( ijkreglement )
   Other explicit requirements : affixing cf inspection marks , obligations
   of applicants for inspections .
 - Orders relating tc the inspection of measuring instruments ( ijkbeschikking
   Technical requirements .
   Up to the present no special requirements exist for continuous totalising
   weighing machines : they are automatic weighing machines and they must , in
   principle , comply with the orders relating to this type cf machine.
MGIED KINGDOM
-- Weights and Measures Act 1963
- Weights and Measures Regulations 1963
   SI 1963     17 10
 ---pagebreak---                             PROPOSAL FOR A COUNCIL DIRECTIVE
                 cn the approximation cf the laws of the Member States
                  relating tc continuous totalising weighing machines
                     ( presented by the Commission to the Council )
THE COUNCIL OF THE EUROPEAN COMMUNITIES ,        .         ^
Having regard tc the Treaty establishing the European Economic Community
and in particular Article 100 thereof ;
Having regard tc the proposal from the Commission ;
Having regard tc the Opinion of the European Parliament ;               '
Having regard to the Opinipn of the Economic and Social Committee ;
Whereas in the Member States the design as well as the procedures for
                                         „ . 1
inspection cf continuous totalising weighing machines are subject tc
mandatory provisions which differ from one Member State to another and
consequently binder trade in such .machines * whereas it is "therefore t
necessary. t-r ..approximate these ^ revisions ;
Whereas the Council Directive of 26 July 1971^^, concerning the* approximation
of the laws of the Member States relating tc common provisions for both'
measuring instruments and methods of metro logical control has laid down the
EEC patera approval and EEC initial inspection procedures ; whereas , in
accordance with that Directive , it is appropriate to lay down , in regard to
continuous totalising weighing machines , the technical requirements , as tc
design , construction and operation which these machines must satisfy in order
to be able to be freely imported , marketed and used after having passed the
required inspections and having beeri provided with the required marks and
symbols ;
Whereas the aforesaid Directive also stipulates that the Special Directives
may specify , when conditions so permit , the date cn which each Member State
shall abrogate the national provisions applicable to machines similar to those
which satisfy the Community provisions ; whereas in this particular case , it is
not yet possible to fix this date ;
HAS ADOPTED THIS DIRECTIVE :
   OJ Ne L 202 , 6 September 1971 , p. 1 .                             • • /• • •
 ---pagebreak---                                   r 2 -
                                Article 1
Tnis Directive applies tc continuous totalising weighing machines .    These
machines are defined in item 1 cf the Annex,
                                Article 2
The continuous totalising weighing machines which may receive the EEC
marks and symbols are described in the Annex. They shall be subject to
EEC pattern approval and shall be submitted tc EEC initial inspection.
                                Article 3
No Member State may refuse, prohibit or restrict the placing on the market
or entry into service of continuous totalising weighing machines bearing
the EEC pattern approval symbol and the EEC initial inspection mark.
                                Article 4
1 . Member States shall put into force the 'laws , regulations and administrative
provisions needed in order to comply with this Directive within eighteen
months cf its notification and shall forthwith inform the Commission thereof.
2 . Member States shall ensure that the texts of the provisions of national
law which they adopt in the field covered by this Directive are communicated
tc the Commission .
                                Article 5
This Directive is addressed tc the member States .                             1
                                       Done at Brussels ,
                                              For the Council
                                      ;      ■ The President
 ---pagebreak---                           These provisions are applicable to continuous totalising
weighing machines mounted on a conveyer belt using the action of gravity
cn the item to be weighed.                                                              -
                                           ■  CHAPTER I         ■
1 - Définition
        Continuous totalising weighing machines on conveyor belts are machines
intended for the determination of the weight of a bulk product, without
systematic splitting up . the movement cf the belt being uninterrupted.
2 - Classification                                                •      -
 2.1 - According to the method of totalisation                                                    •'
   2,1,1 - Operating by addition :                                                                1
      •    ..        . Machines on which the . totalising device performs the addition of
                  , successive . partial, loads , each of them' corresponding to a determined
               ,, length of travel ^cf the- belt , : ,
   2.1.2 - Operating by integration :
                       Machines on which the 'totalising device performs the integration ,
                 ,. .with , respect ; tc time, cf the product *£ the -'load per unit length
                       and the sp^ed of the belt .                           :
                                                                                      C
 2.2 4 Accrrdin^ to the type of lead receptor .                                  ,r ,           .
   2.2.1 - Weighing table type :                                                              ,
                   ■ Machines the lead receiver (termed "weighing table"?) of which
           i ;• l constitutes c nly-a. part f of the conveyor. *
  2.2.2 .- InccT^oratëd ccnveycr typé :
                       Machines the l^ad receiver cf which is constituted by the entire
     ... ,    .j , c,fnveye.r . .■                          •
3 - Constituent, devices                                      . <      ~i  '              : ;
 3 . 1; - Principal devic es - . . ;            - t .; .< ■         '.         ;v ' •
   3,1.1 - Conveyor belts
                       Part cf the machine intended fot transporting the product by
                       means of a ; belt resting- on revolving rollers . "*■'
 ---pagebreak---                                    - 2 -
 3.1.1.1 - Carrying ro 11ers
            Cylinders by means of which the conveyor belt is supported on
            a fixed, frame.          ..         ; -
 3.1.1.2 - Weighing rollers
            Cylinders by means of which the conveyor belt is supported cn
            the load receiver cf the weighing unit .
3.1.2 - Weighing unit
         All or part c fa non-autcmatic weighing machine providing
         information concerning the weight cf the load to be measured .
3.1.3 - Belt travel transducer                       >
       . Device feeding the conveyor and supplying either discontinuous
         information corresponding to a given length cf travel of the belt ,
         or continuous information in prcporticn to the speed of the belt .
         The part cf this device in permanent contact with the belt is
         termed " travel pick-up device".
3.1.4 - Totalisation device
         Device carrying out the adding of partial loads or the integrating
         of the product of the load per unit length by the speed of the belt ,
         from information supplied by the weighing unit and the travel
         transducer .
3.1.5 - Totalisation indicating device
         Device receiving information from :the totalising device and
         indicating the weight of the lnads. transported .
         These devices are called partial indicating devices when they are
         fitted with a device for re-setting to zero .
         These devices are called complementary indicating devices when
         they are intended to give results relative to a fairly long
         operational time and have in consequence a scale division far
         greater than that cf the main indicating device.
3.1.6 - Zero setting device
         Device making possible a zero totalisation over a whole number cf
         revclutions of the empty conveyor.
         The zero setting device may be ncn-automatic , semi-autcmatic , or
         automatic .
         It may comprise a zero setting indicator device separate from the
         totalisation indicator .
 3.1.6.1 - Non-automatic setting device
            Device allowing . reading , setting to zerc and checking of the
            zero position by the operator.
 ---pagebreak---                                        - 3 -
     3.1.6.2 - Semi-automatic zero setting device
                A semi-automatic zerc setting device enables the weighing
                machine by a manual command , tc be set to zerc automatically
                when a signal has been received from the device , rr else
                indicates the value by which it is necessary to adjust the
                zero setting device.
     3.1.6.3 - Autcmatic zero setting device                             '  '
                An automatic zerc setting device allows the machine to be set
                tc zerc without the intervention of the operator when the belt
                has begun tc run with no load .
 3.2 - Ancillary devices                               "
  3.2.1 - Instantaneous lead indicating device
            Device indicating at all times the weight of the load, acting on
            the weighing unit , ,                              -
   3.2.2 - Flow indicating device
            Device shewing , at all times , the weight of product transported
            per unit time .
  3.2.3 - Operate ry checking and monitoring devices
            Devices enabling certain functions to be checked and intended
            notably :
            - to simulate the effect of a constant load , the belt turning
              while empty ,
              to compare with one another two integrations of a load per' '
              unit length over the same interval of time ,                 –-
            - to signal when maximum load or maximum . flow is exceeded ,.
            - to draw the attention rf the user to a malfunction , more
              especially of the' electrical' components .            '
  3.2.4 - Flow regulating device
            Device intended to ensure a practically constant programmed flow,
  3,2.5 .- P redet ermining device •;                    :•        . f :
            Device enabling the feed to the conveyor to be cut off when the
            totalled load reaches a predetermined figure ,
  3.2.6 - "Movement simulator", auxiliary checking device
            Device used in the workshop for the inspection of ccntinuous
            totalisers , withe ut. their conveyors , and intended to simulate
            the movement of the belt .
  3.2.7 - Totalisation checking indicator
            Device with a scale division smaller: than, that of the normally-
            used totalisation indicating device ; it is used during inspections ,
4 - Metro logical^ character ! sties
 4 , 1 - Trtalisation scale division                      ....         ;
         Value , expressed in unit weight , equals
         - in continuous indication , to the smallest division-<?f the
           totalised weight scale :, ( dt ):                      .. . ,\     ,
 ---pagebreak---                                       r « s
     - in discontinuous indication , tc the difference between two readings
         cf consecutive values cf the totalised weight : ( dt d. ).
                                               /
4.2 - No-l^ad trtalisation indicate r Itero indicator ) scale divisicn d
       1 .   ' 1      1      111                    –               '     o
       The scale division of the nc-lcad totalisation indicator allows
       monitoring of the zero when the belt is not loaded .
       Value , expressed in. unit weight , equals :
       - in continuous indication , to the smallest scale division of the
           no-load totalisation indicator ;
       - in discontinuous indication , the difference between two indications
           of consecutive values by the no-load totalisation indicator.
4.3 - Weighing length ( L)
       Distance between the spindles of the furthermost , rollers cf the
       weighing table , increased by the half-distances separating the spindles
       of each of these rollers from those of the nearest rollers cf the
       conveyors .
4.4 - Weighing cyc le
       Entirety cf the actions relating to each addition of partial loads
       at tv.e end of which the totalising- elements cccupy the 'sane position
       or ere in fan sane state as at £hs outeet , with the exception of
       those of the totalisation indicating device.
4.5 - Maximum capacity (Max ) and minimum capacity (Min ) of the weighing
       unit                          .       ,
 4.5.1      Maximum capacity
            The maximum load weighable by the weighing unit fitted with the
            conveyor belt .
 4.5.2 - Minimum capacity
            The load value below which the use cf the weighing results may
            give rise to an excessive relative error in the totalisation
            results .
 4.5,3 - Range of weighing unit
                                 \       ' •- '  v
            The interval between the minimum and maximum capacities .
4.6 - Maximum flow (Qmax) and minimum flew (Qmin )
 4.6.1 - Maximum flow
            The maximum flow is that obtained frr the maximum capacity cf
            the weighing unit when the belt is travelling at the highest
            designed speed .
 4.6.2 - Minimum flow
            The minimum flow is that obtained for the minimum capacity of
            the weighing unit when the belt is travelling at the lowest
            designed speed .
4.7 - Mean test flow
       Quotient of the totalised load divided by the testing time .
                                   Q « C
                                        t                                 /
 ---pagebreak--- 4 . 8 - Minimum trtalisatirn
        The minimum trtalised weight r f a product bel<-w which the results
        may be affected by an error greater than the maximum errrr tolerated
        frr any flow in tl:e range frcm tl.e 'maximum to the minimum flrw .
  4.8.1 - Minimum totalisation fcr normal use
           Value rf the trtalised weight stipulated by the regulations ,
           belcw which the results are considered as liable to contain
           excessive inadmissible errors .
  4.8.2 - Minimum totalisation fer tests
           Value of the totalised weight stipulated by the regulations ,
           belrw which the results yielded by the tests are not considered
           valid for inspection purposes .                              , . -
4.9 - Maximum load per unit length ( CI ) of the belt
        Quotient c-f the maximum capacity of the weighing unit divided by the
        weighing length
                                     r 1 s Max
                                     C1     -7T
                                   CHAPTER II
                             METRQLQGICAL REQUIREMENTS
  - Limits_cf_the_precis_i£n_classes
5 . 1 - Précision classes.     ,
        Totalisers shall be divided into three categories of precision ,
        namely :                                                              .-
                                    Class 0.5
                                    Class      1               ,
                         • '      • Clàss '   2
5.2 - Division into the three clasees v
        The machines shall be classified in terms of their characteristics
        and metro logical qualities , . .     ;              : ■ v •> '
  5.2.1 - Characteristics of Class 0.5 machines
    5.2.1.1 - Value c-f the totalisation scale division ( dt ) .               -
              The value of the totalisation scale division shall be :
              - not- more than" one four-thoukahdth pf the load (Cmax) which
                 can be totalised in one hour at the maximum flowrate , ,
               - nr t less than one hutidred-fchcussandth cf this same load ( Cmax ),
 ---pagebreak--- 5.2.1.2 - Value r £ the zero indicator scale division ( do )
            The value of the zero indicator scale division shall be n^t
            more than one fifty-th< usandth cf the load (Cmax ) which can
            be tctalised in one hrur at the maximum flrwrate , without
            being greater than the totalisation scale division ( dt ).
 . 2.2 - Characteristics of Class 1 machines
5.2.2.1 - Value of the totalisation scale division ( dt )
            The value of the totalisation scale division shall be :
            - not more than one two-thousandth cf the lead which can be
              totalised in one hour at the maximum flowrate (Cmax),
              not less than cne fifty-thousandth of this same load (Cmax ).
5.2.2.2 - The value of the zero indicator scale division
            The value of the zero indicator scale division shall be not
            more than one twenty-thousandth of the load which can be
            totalised in one hour at the maximum flrwrate , without being
            more than the totalisation scale division .
. 2.3 - Characteristics of Class 2 machines
5.2,3.1 - Value cf the totalisation scale divisicn ( dt )
            The value of the totalisation scale division shall be :
            - not more than cne thousandth cf the lead which can be
              totalised in one hour at the maximum flowrate (Cmax), ,
            - not less than one twenty-thousandth of this same load .
5.2.3.2 - Value of the zero indicator scale divisicn
            The value cf the zero indicator scale division shall be net more
            than one ten-fikrusandth of the load which can be totalised in
            one hour at the maximum flowrate (Cmax ), without being greater
            than the totalisation scale division ( dt ). ■
. 2,4 - Form of the scale division
         The scale division shall be of the form 1 . 10n , 2 . I0n , 5 . 10n
         n being a whe le positive or negative number rr zero . The scale
         divisions cf the zero indicator and of the control totaliser ,
         however , need net ccmply with this requirement .
. 2.5 - Minimum load on the weighing unit . v         , •
         The minimum load cn the weighing unit shall be equal to one fifth
         of the maximum load .                                             ~
          I                         =1
  The machine being correctly set to zero with no load ,, the maximum
  permitted errors shall be equal , with plus; or minus sign , to the values
   specified below , f^r any totalised weight greater than or equal to the
  minimum totalisation .
 ---pagebreak---                                          - 7 -
6 . 1 - Maximum errcrs permitted in the initial inspection
    6 . 1 . 1 - Class 0.5
    6.1.1.1 - Simulatie n tests
                    - For any flrw in the range 5 - 20/o of the maximum flew ,
                       0.05% of the lead which wculd have been totalised at the
                       maximum flrvrate during the pericd cf the test-.*
                    - For any flrw in the range 20 - 100% cf the maximum flew ,
                       0.25% cf the totalised lead .    k     •                    •
    6.1.1.2 - Material tests
                    0.35% cf the totalised load for any test flow in the range
                    20 - 10G% cf the maximum flow ( plus one control totalisation
                    scale division when the indicating device is discontinuous ,
                    i.e , digital ),                                           ,
 6 . 1.2 - Class 1
    6.1.2.1 - Simulation tests
                    - For any flow in the range 5 - 20/= cf the maximum flow ,
                       0.07% c f the load which would have been totalised at the
                       maximum flowrate during the period of the test .*-
                    - For any flrw in the range 20 - 100% cf the maximum flrw ,
                       0.35% cf the totalised load ., .                    '
   6.1.2.2 - Material tests
                    0.5% cf the totalised load frr any test flow in the range
                    20 - 100 % cf the maximum flow ( plus one control totalisation
                    scale division when the indicating device is digital ).
 6 . 1 . 3 - Glass 2
   6.1.3.1 - Simulation tests
                  - For any flow in the range 5 - 20% cf the maximum flow ,
                    0.14% cf the load which would have been totalised at the
                    maximum flowrate during . the period of the test .*-
                 - For any flow in the range 20 - 100% cf the maximum flow/
                    0.77, cf the totalised load .                            -   '
   6.1.3.2 - Material tests                                ; 3 .
                    1% of the totalised lead frr any test flow in the range
                    20 - I007o cf the maximum flow ( plus one control totalisation
                    scale division when the indicating device is digital ),
6.2 - Maximum errors permitted in service
 6.2.1 - Class 0.5                                                                   T
               0,5% cf the totalised load for any test flow in the range
               20 - 100% cf the maximum flow .                           '
See 13.2
 ---pagebreak---                                       - 8 -
  6.2.2 - Class 1
              U of the totalised lrad frr any test flrw in the range
             20 - 100°', cf the maximum flrw .
  6.2.3 - Class 2
             27c, cf the totalised load for any test flew in the range
             20 - 100% cf the maximum flew.
7 * C£nditicns= f2r_atElic§bilitY ff_.?§xipjm_permitted_errr rs
    The maximum permitted errors specified abeve are applicable only to
    the totalisation results and under the following conditions :
 7.1 - Machines having more than one totalisation indicator
         When a machine incorporates several indicators the results supplied
         by each cf them for one and the same totalised load shall not ccntain
         errors greater than the maximum permitted errors .
      . The difference between the results , taken two by two , must not be
         greater than :
     ;   - one scale divisim of the digital indicator device , when the
            results .p.ra supplied by two digital indicators having compulsorily
            the same scale division ,
        -- the absolute value of the maximum permitted error , when the
            results are supplied by two continuous indicators ,
         - the greater cf the two' following values :
                 - absolute value cf the maximum permitted error ,
                 - one digital scale division ,
            when the results are supplied by a continuous indicator and by
           •a digital indicator .
 7.2 - Simulation tests
         The result cf the simulatien tests shall be independent of any
         variation in the speed cf the meter of the travel simulator ,
         within the limits cf plus or minus 10% cf the nominal speed cr
         the design speeds .
  7.2.1 - Movement simulation device
             The uncertainty in the measurement' of the simulated belt travel
             shall be less than one fifth of the maximum permitted errors on
             the totalised load .
             These uncertainties are included in the maximum permitted
             errors .
  7.2.2 - Difference between two results obtained by varying the
             application point cf one and the same load .
             When the point of application of one and the same lead is varied
             in a manner compatible with the design ef the load receiver , the
             difference between any two results shall not be greater than the
             absolute value of the maximum permitted error .
                                                                        • •• / • • •
 ---pagebreak--- 7.2.3 - Zero setting device t
        For any lead balanced by the, zero setting device , the instrument
        shall comply with the maximum permitted errors corresponding to
      . the totalised load. ..                 .   ,
7.2.4 - Influencing factors
 7.2.4.1 - Temperature-
             Machines shall , satisfy the requirements relating to the
             maximum permitted errors , in the casecf any temperature
             variation within the range from - 10° to + 40*C .   Nevertheless
             fcr special uses the machines may have different temperature
             ranges from thrse specified above ; in that case the interval ,
             of at least 30°C , shall be mentioned on the rating-plate. In
             the tests , the temperatures shall be considered stable if
             their variation is not greater than 5°C per hour.
             In the case of a variation of 10°C and provided always that the
             temperature variation is not greater than 5°C per hour , the
             machines shall be so designed that their no-load readings do
             not vary by more than                                       .
                               0 . 057=. ( fer class 0.5 )
                               0.077. ( for class      1)
                               0.147. \ fcr class      2)
             of the loa:d which would have been totalised at the maximum flowrate
             during the test period .
 7.2.4.2 - Influence cf the electric power supply
             The machines shall satisfy the requirements relating to. . the
         . maximum errors , in the case of : variatirns :
             - in the voltage of their energy source, of plus 10% and minus
                157o cf the nominal value ,                        . i'
             r- in the; nominal frequency of the supply from that source , of ,,
                plus or minus 270 .
 7.2.4.3 - Othet influencing factors
             Machines shall , under the nmnal conditions of use, satisfy the
             requirements relating to maximum permitted errors when they are
             subjected to the effects of influencing factors other that! those
             mentioned in the foregoing paragraphs and resulting from the
             conditions of installation (vibrations ,, atmospheric conditions
             etc . )
7.2.5 - Metre logical qualities
 7.2.5.1 - Repeatability                     .....
             The difference between two' results obtained with one and the
             same load placed under the same' conditions on the load receiver
           • shall not be greater than the absolute value of the' maximum
        , . permitted error. •                        4 "
 7.2.5.2 - Discrimination of the totalising device
             At all rates of flow between the minimum and maximum and fcr
             two loads differing from each other by a value equal to the
             maximum permitted error at this load , the difference between
             the results shall be at least equal to five tenths of the
             calculated difference between the loads .                     ,
 ---pagebreak---                                        - 10 -
  7.2.5.3 - Discrimination cf the zerc indicator device
              For a test rf a duration of three minutes , the difference
              between the readings supplied by the zerc indicating device
               ( a ) fcr a zerc load , and (b ) for a lead equal tc the fraction
              of the maximum lead as belcw :
                              0.05 /» fer class 0.5 machines "           ;
                              0 . I"  fcr class . 1 machines
                              0.2%    for class   2 machines       . .
              shall be clearly appreciable ,
  7.2.5.4 - Stability of zero
              After three minutes of nc-lcad operation , the zero indicator
            • device shall not vary by more than the fraction shown belcw
              of the load which would have been obtained at maximum flow
              for three minutes :
                              0.027o fcr class 0.5 machines
                              0.05% fcr class     1 machines
              and             0 . 1% fcr class    2 machines .
  7.2.5.5 - Tests cf complementary indicator devices
              The complementary totalisatcr devices
              - shall not interfere with the operation of the weighing machine
              - shall be constructed in such a way . that the results obtained
                  from them are correct .
7.3 - On-site tests
      The maximum permitted errcrs are applicable tc any product quantity
      which is at least equal to the minimum totalisation ."
 7.3.1 - Travel pick-up device                                         '
           The travel pick-up device shall virtually not slip on the belt .
 7.3.2 - Test instrument
          m
          The machine used for checking purposes in . the material tests shall
          permit the totalised load to be checked with an error equal tc not
          more than cne fifth of the maximum permitted error.
 7.3.3 .- Vaiue of minimum totalisation for normal use           •
          The minimum totalisation shall be not less than the largest cf
          the three values belcws
             the load obtained at maximum flow with      cne complete belt
             revolution , or
          – in class 0.5 , 5% cf the load totalised      in cne hour at maximum
                              flow or 500 totalisation   scale divisions ;
             in class 1 , . 2% cf the load totalised     in one hour at maximum
                              flew or . 200 totalisation scale divisions ;
             in class 3 ,     1% of the load totalised in cne hour at maximum
                              flow or 100 tctalisaticn scale divisions .
                                                                           • • # /• • •
 ---pagebreak---                                       - 11 -
 7.3.4 - Values cf the minimum totalisation for test purposes
          The minimum test totalisation shall be nrt less than the larger
          cf the twc values belrw :
          - quantity totalised during three minutes at test flrwrate ;
          - quantity corresponding to the value cf the minimum totalisation
             for normal use ( specified in section 7.3.3 , taking into accrunt ,
             if applicable , the value cf the test ( or checking ) * totalisation
             scale division , in which case the numbers cf divisions to be
            taken into consideration are
                               1000 fer class 0.5
                                500 fer class 1
                                200 for class 2
 7.3.5 - Maximum errors permitted in inspection cf zero indicator
         After a complete number of belt revolutions , the zero indicator
          shall not have shown ar,y variation greater than the fraction shown
          below , of the load obtained at maximum flow during the test time :
                               0.05 /* fcr class 0.5 macnines
                               0.1%    fcr class 1   machines
                               0.2% fcr class 2      machines .
See 3.2.7 ,
 ---pagebreak---                                                 fl-fy                      CL?-* 8 C.5                    CiLSS l                       Clans 2
                                                                    Cmax             Cmax      cmax                  Cmax      Cmax                    Cmax
7.4.1 - Value cf totalisation
           scale divisirn (dt )                                    100000 ^
                                                                              dt
                                                                                   ^ 4000    50000            <      2CC0   20000ν ^     ^    dt ^     1000
                                                                                   Cmax                        Cmax
7.4.2 - Value cf zerc indicator                                        dc" <      5COOO            do    V    20000              de ^ 1000U      Cmax
           scale division ( de )                                   and                        and                           and
                                                                       do                          dt         dt
                                                                                                                                 dc             dt           *
                                                                                                                                                             .ο
                                                                                    Maximum permitted errors                                                  ι
7.4,3 - Simulation tests                                                                     0.7                                                             Η
                                            – Qmax        ' Qmin   luOO
                                                                          Qmax x t ( l )    luOO      Qmax x t                 1.4                           0>
                                                                                                                                                             Cf
                                                                                                                             1000
                                                                                                                                     Qmax x t
                                                                                                                                                             ο
                                                                        _2,5 .                         3.5                       7                           01
                                           Qiain ^ Q i Qmax             LuOO                          looo                     1000
                                                                                                                                       _   r\
                                                                                                                                           υ                 c
                                                                                                                                                             p
7.4.4 - Material tests                                                                           /1 v-–
                                                                                                      '5              ^            f lû
   7.4,4.1 - initial(l )                   Qmin <. Q ^ (<max :+ \TJoU C 4 c )                +               C -i- d                                         H-
                                                                                              - \ 1υου       - ■ - /        -r
                                                                                                                                   V looo       C4 d|        t0
                                                                                                                                                             H-
                                                                                                                                   t                        Le?
   7.4.4.2 - in servicft(l )               Qniin < Q < Q?na* k ( yïk C + d ^                 +- (– V100C
                                                                                                            C + u      j    +
                                                                                                                                  k_
                                                                                                                                     ■
                                                                                                                                          20
                                                                                                                                        20Ct>
                                                                                                                                                C + d [
                                                                                                                                                             ÏQ
                                                                                                                                                             B
                                                                                                                                                             (D
7.4,5 - Minimum t _ talisation                                                                                                    Tmin ^         , ■ ■ Cmax
           value (Tmin)                                          •
                                                                 aod
                                                                     Tmin A- –– Cmax
                                                                            ' ICO               ^Taiin > y-
                                                                                              and
                                                                                                              lOO
                                                                                                                     Cmax
                                                                                                                          i and
                                                                                                                                              ^ 100
                                                                     Tmin > 3% dt                  Tmfn > 230 et                  Tmin ^ 100 dt
7.4.6 - Simulation test cf variation                                                                0. 7                         1.4
           cf no-load reading with ?.0°C        0 = 0                       Cmax x t                      Cmax x t                        Cmax x t
                                                                      1000                         looo                         1000
           temperature variation
7.4.7 - Simulaticn test r f zero           lst test with no                                     2nd test for
           indicatcr discriminaticn        load fer 3 minutes                                      3 minutes
                                                                           Max                           Max                              Max
                                                                          10O0                         LuOO                              looo
                                                difference between the twe tests to be clearly perceptible
7.4.8 - Zerc stability                     with no le ad for                   variation cf zerc indicator
           ( simulation )                       3 minutes            /    0.2                             0.5
                                                                     ^ 1000    Max
                                                                                                         looo
                                                                                                               Max               i       looo
                                                                                                                                                Max
7.4.9 - Zerc stability                     n-number of belt
           (with belt )                       revolutions                 C.5                                                              2
                                                                               Qmax x t                        Qmax x t                         Qmax -x t
                                           n is tr be a whole           1ΟΟ0                             1000                           1000
                                              number
 Cmax *» load totalised in one hour at maximum flow                                      C * totalised load
  t     ** test time expressed in hours
  ( 1 ) the quantity d must only be added for digital indicators having a discontinuous scale division of value <5
 ---pagebreak---                                          • CHAPTER III
                                     TECHNICAL REQUIREMENTS    ,
8 - Constitution                                                                         1 \
                                                         -         -s      */•       '         •
      Continubus totalisërs must comprise : '              ' '              '
      - a convey^r belt ,          v               -   '
      - a   weighing unit ,
      -•a   travel pick-up device,
      - a   totalising device crupled tr one cr mere indicator devices
      - a   zero setting device.
      The zerb setting devices 6f: continuous tctalisers shall be fitted with
      a zerc indicating device, distinct ; from the totalisation indicator ,
      where :                                                              ...      • '*
      - the totalisation device only takes into account the positive values
        of the belt in relation to its mean weight per unit length ,
      - the value of the totalisation scale division is greater than one
        fifty-thousandth of the weight of the load totalised in one hour at
        maximum flow for machines of Class 0.5 , cr than one twenty-thousandth
        of the weight of the load totalised in one hour at maximum flow f<?r
        machines in Class 1 , or than one ten-thousandth of the weight' of the
        lead totalised in one hour fit maximum. flow for machines of Class 2 .
 8 . 1 - Conveyor belt
   8.1.1 - Continuous totaliser with incorporated conveyor              -
               The conveyor shall be constructed in a robust manner and. shall ' .
               form a rigid assembly .       Where the roller support is used as the
               Single IbatJ 'lever of the weighing unit,' the product shall arrive
               at right angles to the linkage of this lever.
               Machines constructed in this way are classified in Class 2.                   j
  8.1.2 - Continuous totaliser with weighing table
                                                                               . • ' 'v ,        -
               The frame support of the conveyor shall be constructed in a
          »•' robust manner. : In a longitudinal right' 'cross-Bectibni the
               roller track shall hot show- ainy upward concavity. The cotiveyor
               shall , where necessary ^ be fitted with a belt cleaner device , the
             . position and functioning of which shall in no way pffeet . the results .
   8.1.3 - Special installation conditicnsi- .                    .>            -
               Continuous totalisers shall be Such' that the installation of the
               roller track, the constitution , and mounting : cf the belt < and . the
               product feed arrangements do not give rise to any errors . In the
               result .
     8.1.3.1 - Relier track
                    An efficient protection system against : ccrrosion and fouling
                 • shall be provided : if necessary* !
                    The upper generatrices of the rollers shall be virtually
                  . '.situated on one and the same plane, *
                    The roller track shall be such that no slipping of the product
                    occurs .
 ---pagebreak---                                         - 14 -
   8.1.3.2 - Conveyor belt
    8.1.3.2.1 - Weight per , unit length cf the conveyer belt
                  The weight per unit length of the belt shall be virtually
                   constant. .'_Xhe! joints must not cause any disturbance cf
                   operation.
    8.1.3.2.2 - Belt length
                  Tfie length cf the belt shall be such that the zero setting
                   can be dene in a relatively short time. -        .
    8.1.3.2.3 - Belt speed
      8.1.3.2.3.1 - The speed of the belt shall be such : that a complete
                      revolution takes place in not more than 90 seconds .
      8.1.3.2.3.2 - The speed of the belt shall not vary by mere than 5%
                      during a weighing operation.
  8 . 1.3.3 .- Weighing length
               The machines shall be constructed in such a manner that the
               weighing length remains unchanged during service.
               The weighing length adjustment devices shall be capable of
               being sealed.
  8.1.3.4 - Belt tension
               At one point on the track the belt tension shall be made
               practically constant .
               The tension shall be such that * under normal working conditions ,
               the belt virtually cannot slip on the driving drum.
                                                     - ···.·.·· · Γ
  8.1.3.5 - Action cf the preduet
               The arrival of the product on the conveyor must not distort
               the results .
8.2 - Weighing unit '      ■
 8.2 . 1 - General
            The weighing unit shall; be suitable for its purpose. It shall be
            protected , insofar as is necessary , against any effect of
            accidental overloading beyopd the maximum capacity .
 8.2.2 - Load balancing devicer
            The load balancing device shall have a continuous action from
            zero to a weight value at least equal to the maximum load .
           TThe weighing operation shall riot commence until the weighing
         :  unit is in normal working order.
8.3 - Travel transducer
        The travel pick-up device shall: be so designed that no possible
        slipping can falsify the measurement figures , whether the belt is
        loaded rr not .
 ---pagebreak---                                               - 15 -
            When the measurement signal is discontinuous it shall correspond
   - ■       to belt mouvements equal to • or less than the weighing length.
            When the measurement signal is continuous it must net be replaced
            by a signal independent of the conveyor .        .
            Any adjustable parts roust be capable of being sealed, ,            r
  8.4 - Totalisation device                1   .
         r Xhe totalisation device must operate permanently anc must be such
            that accidental stopping of its functioning is signalled .
  8.5 - Totalisation display and print-otst devices
   8.5.1 - Quality of the indication .
                  Totalisation display and print-out devices shall permit an
           ■5     accurate, easy: and unambiguous reading of the results , by simple
                  justaposition of the figures , and shalL bear the name or symbol
                  of the corresponding unit of weight .
   8.5.2 - Value of the scale divisions ,                      .
                 The scale division of the continuous indicator devices shall not
                  be greater than the scale division cf the digital indicator
                  devices nor smaller than one tenth of the value of the latter .
                  Digital partial indicating devices shall have scale civisicns
                  of equal value.
       i i    \i                         •
   8.5.3 - The form of digital results               \
              w The results furnished by digital indicators shall be presented
                  exclusively in the form cf aligned figures .              ;
   8.5.4 - Reliability of readings
            v ' ; The results acquired must riot' be >vitiated by , for Instance ,
                  accidental stepping cf the belt or by a breakdown in the power
                  supply.           . ._     .......                     ..  • ... r
   8.5.5 - Range of indication                                              .
                  Indicating devices shall be such' that they allow the reading of
                  a value at least equal to the quantity of product weighed in
                  ten hours of operation at the maximum flow. This requirement is
                  not applicable to partial indicating devices ,
. 8.5.6 - Complementary indicating, devices
                  The scale division of the complementary Indicating defvice shall be
                  at least equal to 10 times the totalisation scale division entered
                  on the rating-plate. The requirements under section , 5.2 are not
                  applicable to it .         .. ..       ,
   8.5.7 - Coupling cf indicating devices ; <•
                  Totalisation display and ptint-out devices which tak^' into account
                  only the positive belt values shall be disengaged when the belt is
                  operating unloaded .
                  Totalisation display and print-out device which take into account
                  positive and negative belt values must be engaged when the belt is
                  operating unloaded . They shall be constructed in such a manner
                  that the reading cannot be modified by vibrations .
 ---pagebreak---                                             - 16 -
               The engaging and disengaging cf the totalisation devices shall
                be perfrrmec ly ti>e_ machine itself and be actuated by the load.
           ... The ccntrr I, totalisation indicator shalT'ctily be : piit' in operation
                during inspections .    „       .                                    1
8.6 - Zéro setting dcvire
       The effective weight cf the belt may be balanced by any device cf
        a nature appropriate to the principle cf operation pf the . machine;
         ( integration or addition, positive and negative) provided always
     ; that invariability of the adjustment cf the device is ensured.
 8.6.1 - Non-autcmatic zero setting device
               Where the regulating of this device can ; be done manually , in a
               continuous manner , any movement cf the final operating element
               corresponding to 10 mm if it is graduated , cr tc 0.5 of a turn
               if it is not , shall not have an effect greater than :
               T one two - thousandth of the load totalised in one hour at
                   maximum flow , for class 0.5 machines ;
               - cne thousandth of the load totalised in one hour at
                   maximum flow for class 1 machines ;
               - two thousandths of the load totalised in one hour at
                   maximum flow for class 2 machines .
               Where the regulating of the device can be done manually in a
               discontinuous manner , the value of the scale division of the actuatin
               device shall be not greater than:
               0.005% of the load tctali-ed in cne hour at maximum flew for
                        class 0.5 machinée ;
               0.01%    cf the load totalised in one hour at maximum flow for
                        class 1 machines ; .
               0.02%    cf the load totalised in one hour at maximum flow for
                        class 2 machines . '               x                       ■
               The direction of any correction to be made must be easily
       ,       determinable .             -        ;
 8.6.2 - Semi-autcmatic or autematic zero setting device
               Semi-automatic or automatic zero setting devices shall be
             - constructed in such .a way that :
               - the resetting to zero takes place after a complete number cf
                   belt turns ;
               - the end of the zero measuring or of the operation is signalled ;
               - a signal is emitted when they reach the limit cf their movement .
               After operation of these devices , the error in the setting shall
               not exceed the following values :
               0.05%    cf maximum flow for class 0.5 machines
               0 . 1%   cf maximum flew for class 1 machines
               0.2%     cf maximum flow for class 2 machines '                  \ l.
               durtng the period cf the - test .
 ---pagebreak---                                      - 17 -
         • For inspection purposes the automatic zero setting devices shall
           be shut cff .       ' •      -■ ••                 ■   ■ •'
 8.6.3 - No-load test device
           Machines which do net permit deduction or which only perform
           positive integration shall be provided with a no-load test device
           the essential element o£ which is an additional weight equal tc
         - not . mere thant
           2.5% of the maximum capacity of the weighing unit for class 1 ,
           57o of the maximum capacity of . the weighing unit for class 2 ,
           tc be placed cn the load receptor ,
        1 The device shall satisfy the following requirements :
        . - The weight shall be applied in an invariable manner by an
             • Appropriate mechanism.
           - The weight shall be protected against dust .
           - The application of the weight shall be clearly signalled.
           - The application of the weight shall only be possible when the
               belt is revolving unloaded.
           - The no-load test operation shall take place according to an
               invariable procedure ; this test shall be carried out on
               a complete number of belt turns during at least three minutes .
 8.6.4 - Machines intended for direfct sales to the public
           Machines used for direct sales to the public ( in the presence
           of the public ) shall be equipped with automatic zero setting
           devices .       . . ' .
8.7 - Zerc indicating device . • •
      Where the zero indicating device operates .on the continuous
      indication principle it shall be permanently linked tc the
      totalisation indicating device and participate in the operation
      of this indicator .                     ■ ' ■
      Where the zero indicating device supplies readings only at an
      order given manually or automatically , it must not distort the
      totalisation indicator readings,                ■ *
3.8 - Signalling of overstepping of the maximum weighirg-unit capacity
      or rf the maximum flow
      Any exceeding cf the maximum flow or maximum capacity values shall
      be: signalled ; the same applies for values lower than the minimum
      flrw or minimum capacity.
8.9 » Cnmplementary devices
      The complementary devices are intended to :                       ^
      - indicate the instantaneous - load ,
      - indicate the flow , .         ...           .              it -
      - predetermine the value Vf a totalised load ,.
      - make the flow constant ,
      - perform any other particular function.
      They must not distort the results .
      These devices are not subject to the official inspection.
 ---pagebreak---                                         - 18 -
                                              i'
 8 . 10 - Sealing
            These machines components the dismantling of Regulating of which
            must net be left to the user shall be. provided with .sealing devices
            or encased in a housing capable cf being sealed .
9 '*■' Ratinr-plate's and stamping plates
   ; The totalising machines shall bear , in the cinder shown , as many cf the
       following markings as are relevant :                ,
 9.1 - Compulsory basic data , expressed clearly in the language of the
            country of destination-
  9.1,1 .- The identification . mark or style of the manufacturing firm
   9.1.2 - The mark or style of the importer ( for imported machines )
  9.1.3 - The designation of the machine
   9.1.4 - The type and the serial number of the machine
  9.1.5 - The designation of the product or products to be weighed
  9.1.6 - The minimum totalisation in normal use               , r .. kg or metric tons .
 9.2     - Basic data expressed in code
  9.2.1 - Compulsory in all cases :
               - Pattern approval mark
               - Class of precision
               - Continuous totalisaticn scale divisicn dt » •
               - Digital tctalisation scale division dtd ■
               - Nominal speed cf belt       v ■ ..... m/ s ..
               - Weighing length             ,m .                    . ..  . v
               - Identifying countersign on parts of the machine not
                 directly fastened to the main body.,,
  9.2.2 - Compulsory where relevant :
              -  Maximum capacity    Max....'
             -.- Maximum flew      . Qmax . ...
              -  Minimum flow        Qmin .
              -  Scale divisicn of   zero indicating device          do *
              - Number of cycles per hour ( fe>r machines operating by
                 addition )
              - The inscription : "The machine must be reset to zero every
                 three hours at least . The zero check myst continue for
                 at least ..... minutes ".
                 (The zero checking time will be fixed by the pattern approval ).
 9.3     - Supplementary markings
           Depending on the particular use of the machine, one or more cf
           the following markings may be required :-
           - "Machine prohibited for direct sales to the public "
           - Exclusive usé
 ---pagebreak---                                           - 19 -
  9.4 •» Appearance cf the markings
          The markings rn the rating-plate . shall be indelible and have
          dimensicns , shape and clarity such that they allcw easy reading
          under the normal conditions of use cf the machine .
          They shall be grouped together at one clearly visible point cf
          t'ne machine , on a rating -plate fixed near the indicating device ,
          or inscribed directly on the indicator itself .
          The support bearing the markings must be capable rf being sealed .
  9.5 - Stampin g
          The rating-plate may include a stamping area . If it dees nrt
          include a stamping area , a plate intended for this purpose shall
          be affixed close to it .
                                   .    CMPTER IV
                                 INSPECTIONS AND TESTS
          The EEC pattern approval for weighing machines as well as the
EEC initial , inspection cf weighing machines shall be effected in
accordance with the provisions of- the Council Directive cf 26 July 1971
on the approximation of the lews cf the Member States relating tc common
previsions , for both measuring instruments and methods cf metrclogical
control . Details of some of these provisions are given in this chapter .
10 - . gEÇ^pattern_aj_2rcval                                   ,
           .......        .  » r  . , •    •                          *    *
  10,1 - Application fr r EEC approval
           The application for EEC approval shall contain the following
            information and special documents :
 - 10 . 1.1 - Metrclogical characteristics
    10.1,1.1 - Descriptive data as defined in section 9 above
    10.-1 , 1 . 2 ~ Special features
                    Special characteristics of the weighing unit .
   10.1.2 - Descriptive documents
                                             *
                 - Plan or sketch of the assembly as a whole;
                 - Where necessary , photographs , plans or meckups of details
                   having metrclogical interest .
                 - Schematic diagram permitting easy comprehension cf the
     .      /' ; principle cf operation df the machine.
  10, 2 - Examination for EEC approval
   10.2.1 - In the workshops cf the maker cr in any other suitable place
                 agreed upon by the Metrclogical Service concerned and the
                 applicant , with or without the conveyer to which the machine
                 must be crnnected .
                                                                        • • »/• # ♦
 ---pagebreak---             The workshop tests shall more especially permit cf assessing
             the effect cf the influencing parameters specific, to the selected
            mode cf operation (temperature, voltage, frequency, etc. ) examined
             separately as far as this is necessary.
             It must be possible to carry rut the workshop tests under the same
             conditions as those specified in section 7.2 .
  10.2.2 - Under normal conditions of use
            The material tests shall be carried out with a quantity of
            product not less than the minimum test totalisation at flews in
            the range from minimum to maximum flow.
11 - EEÇ_initial_ins2ectiçn
     The EEC initial inspection of machines shall be carried out in two
     phases : -
     - in the workshop or in any other suitable place agreed upon by the
        Metrological Service concerned and the applicant ! the totalisation
        checks , termed " simulation tests ", performed with the aid of
        standard weights and a travel simulator device ;
     - at place of use : on the complete machine , under the normal conditions
        cf use, the inspection procedure commonly termed "material tests ".
 11.1 - Workshop tests
         The workshop inspection shall comprise the following operations :
         - verifying that the machine ernferms to the approved pattern and
           examining the various parts of the mechanisms ; ,
         - testing the totalisation by travel simulation, in conformity with
           the requirements under 7.2.1 ., 7.2.2 ., 7.2.3 ., 7.2.5 .-
         Vhere the conveyor in its entirety ferns an integral part cf the
         lead receiver , the tests shall be performed on the complete machine.
         Where the conveyor acts on the load receiver only through the part
         of the belt which is in contact with the rollers cf the weighing
         table , the tests shall be performed on the totalising weighing
         machine n^t coupled to its conveyor.
         These tests are to be performed with the aid cf a travel simulator
         device . . They must clearly shew * on the basis cf the standard
         weights used , the result cf the totalisation , that is to say , the
        rtctalised weight and either the mr ber cf cycles rr the number
         representing the length of belt which has notionally passed along .
 11.2 *■ On-site inspection and tests
         The testing shall be done as follows :
  11.2.1 - Feasibility of inspection
            It must be possible to carry out the on-site inspection and tests
            reliably and easily with the product or products tc be weighed.
            The installation of the machines shall be designed in such a
            manner taat it is possible to check theiQ without disturbing their
            normal operation.
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               A checking instrument must be permanently available in the
               immediate vicinity cf the machine cr machines to be checked
               and the storage and transport facilities must be arranged in
               such a way as tc prevent &ny loss cf product .
    11.2.2 - Slipping cf the travel pick-up device
               The slipping , if any , of the travel pick-up device cf machines
               in classes 0.5 and 1 shall be measured .
    11.2.3 - Zerc resetting test
               This test shall be perfr rmed over a complete number of belt
               turns under the conditions set out in 7.3.5 .
    11.2.4 - Stability of zerr indication
               The totalisation indicator shall be observed every three minutes ;
               the variation of the value indicated shall be less than the value
               calculated according to requirement 7.3.5 .
    11.2.5 - Material tests
               These tests shall be effected under the normal conditions of
               use with the product that the machine is intended to weigh.
               The tests shall relate to at least two flrws without allowing the
               maximum flow to be exceeded .    These tests shall be carried out
               with a quantity of product at least equal to the test totalisation .
               The weight cf the product shall be checked befrre or after its
               passage on the conveyor .
                                   CHAPTER V
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                                           )  j
                    RECOMMENDATIONS OF A PRACTICAL MATURE
                                                                        /       •
12 - Recçpçendat irns_çrnçernin|i_^esign_and_çr nstruçtion
       Machines which meet the requirements stated below are considered to
       satisfy the cr rresponding points in the preceding chapters .
   12.1 - Spécial installation conditions
            Continuous tctalisers shall comply with the following conditions
          1 of installation :         • ••   •
    12.1.1 - Relier track­
            :  Toe rollers or roller trains forming the track shall have parallel
        . i ■ generatrices fot each group of rollers . Those situated in the
               immediate vicinity of the end drums need not necessarily conform
               to this requirement . The inclination of the side roller spindles
               to the middle roller spindles shall be not mere than 10° fcr
               machines of Class 0.5 , 20° fcr these cf Class 1 and 30° fcr those
               of Class 2 .
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                                            ?
                                            * • : ri
               The lnclinatirn cf the longitudinal right section cf the
               plane of the upper generatrices cf the rrllers shall nrt be
               more than 5% - for Class 0..j , 10% fcr Class 1 and 20% fcr Class 2 ,
               prrvidsd always that there is no slipping of the product .
               On machines cf Class 0.5 and Class 1 the rcllers cf the weighing
               d-ivic^i ar.d there s ?.t':a';ed iir.neaiat.ely b-af re and after the
               weig-.ii, ig telle shall be mounted tn ball bearixf^s cr cn ary- device
               cf a like nature . The alignment of these rcllers , fcr a given
                l^a^i ;ln the regim cf , for example , half tfc <* maximum Irad , shall
               be cr*rri.?.d rut vith an uncertainty nrt exceeding 0.3 am, the
               eccentricity errcr not being greater than 0.2 mm .
  12.1.2 - Conveyor belt
   12.1.2.1 - Joints                                                 1             .
                   The belt shall be made cf not more than two parts , each having
                    the same characteristics . The joint cr joints shall be made
                    cblr'.qiely and the acute angle betver.n the joint and the lateral
                    edge cf the belt shall not exceed 45° .                       - ,
   12.1.2.2 - Ler.gth
                    rho - in-wound length of the belt shall nrt exceed the travel of
                   a pciut cn the belt at the lowest speed during SO sectnds .
  12.1.3 – Action of product                  .
               The distance between the weighing table and the feeding device
               shall ba Lelween approximately two and five times the distance
               travelled in one second at tnaximum speed by a point on the belt .
12.2 - Movement t ransducer device
        The mar spring cf the length corresponding to the belt travel or the
        measuring cf the speed must be carried rut cn the internal part cf the
        belt .
        On machines cperating by integration , it must be possible to equip the
        novmccj: trar.s^ue.«!!'-:..3ff sent ly trl?.h a device             the number cf turns
        cr fractions             taxas o£ the moviaienfc piefc-up device to be counted .
12.3 - Signgllin g of ^he exceeding of *:he tneritnun woifhinp-np ifc capacity cr
        t<v" -?i^Rrn f >,• :.n ' f j'a&diaf.s lrw.cr than, tha             flcy or r:i>.linua
         capdt it y                                            .....
        On indicatcrs displaying flow or instantaneous load ,, the part cf the
         scale which is below the minimum capacity' or minimum flow value shall
        be dif ferentisted from the rest <- f the dial ,                -•   ;
        These indicators may be replaced cr Supplemented by a, register ,
        provided always that it dees net exercise , any influence cn the
        results .
                                                                                     • • • /♦ • •
\
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 *        Where the instantaneous load indicator is also a flew indicator ,
           it must bear the remark :
           "Flcwrate valid for a belt speed cf ....... m/ s ".
   12.4 - Totalisation display and print -cut devices
          Totalisation display and print-cut devices which only take into
          account the positive values of the belt shall be engaged net later
           than the moment when the flow is equal to
                2.5% of maximum flow , for Class 0.5 machines
                5%     cf maximum flow, fcr Class 1 machines
                5% > of maximum flow , for Class 2 machines
12 - Requirements concerning inspection and tests
  13,1 – Checking of movement pick-up device
          The chronometric check is carried out by measuring , with and
          without load , the time of travel corresponding to a whole number
          of turns of the free drum cf the belt , and the time corresponding to :
          - either a whole number of cycles , for machines operating by
             successive addition ;
          - or of a determined number of turns or fractions of turns of the
             movement pick-up device , for machines operating by integration.
          The ratio of the times for a given movement cf the free drum cf the
          belt unloaded and loaded shall be equal to the ratio of the counting
          times for a given number cf cycles or cf turns cf the movement pick-up
          device unloaded and loaded . Nevertheless , to make allowance for the
          method of checking , a difference of up to 0.1% between these two
          ratios shall be permitted.
          The choncmfeter used for this test shall be such that tenths of a
          second can be read and shall work under the same conditions for each
          of the measurements . The period of these measurements shall be not
          less than rne tenth of an hour so that any operating errors will be
          negligible.
 13.2 - Simulatirn test
          During the simulation tests for any flow Q less than the minimum flow,
          take for the value of Q , a flow equal to Qmax/n with n     5 ; the •
          maximum permitted relative errcr is equal tc
                0.05n7o fer Class 0.5 machines
                0,G7n7, for Class 1    machines
                0 . 14n% fcr Class 2   machines
          rf the totalised load .
          This procedure makes a stop-watch unnecessary;