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Organisation Internationale de Métrologie Légale

Discontinuous totalizing automatic weighing instruments(totalizing hopper weighers)Part 1: Metrological and technical requirements - TestsInstruments de pesage totalisateurs discontinus fonctionnement automatique(peseuses totalisatrices tr mie)Partie 1: Exigences m trologiques et techniques - EssaisOrganisation Internationalede M trologie L galeINTERNATIONAL RECOMMENDATIONOIML R 107-1 Edition 1997 (E) 2 CONTENTSF oreword .. 3 Terminology (terms and definitions).. Terminology2 Metrological Accuracy Maximum permissible Form of the scale Totalization scale interval (dt) Minimum value of minimum totalized load ( min) Agreement between indicating and printing Influence quantities3 Technical requirements .. Suitability for Security of Instruments with control indicating Totalization indicating and printing Ancillary Descriptive Verification marks4 Requirements for electronic instruments.

FOREWORD The International Organization of Legal Metrology (OIML) is a worldwide, intergovernmental organization whose primary aim is to harmonize the regulations and metrological controls applied by the national metrological services,

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1 Discontinuous totalizing automatic weighing instruments(totalizing hopper weighers)Part 1: Metrological and technical requirements - TestsInstruments de pesage totalisateurs discontinus fonctionnement automatique(peseuses totalisatrices tr mie)Partie 1: Exigences m trologiques et techniques - EssaisOrganisation Internationalede M trologie L galeINTERNATIONAL RECOMMENDATIONOIML R 107-1 Edition 1997 (E) 2 CONTENTSF oreword .. 3 Terminology (terms and definitions).. Terminology2 Metrological Accuracy Maximum permissible Form of the scale Totalization scale interval (dt) Minimum value of minimum totalized load ( min) Agreement between indicating and printing Influence quantities3 Technical requirements .. Suitability for Security of Instruments with control indicating Totalization indicating and printing Ancillary Descriptive Verification marks4 Requirements for electronic instruments.

2 General Application of requirements for Functional Examination and tests5 Metrological controls .. Pattern Initial In-service inspection6 Test methods .. Control instrument and test Separate verification Integral verification methodAnnex A Test procedures for discontinuous totalizing automatic weighing instruments .. Comparing construction with Initial examination General Test program Metrological performance Additional functionality Influence factor and disturbance Span stability test Bibliography .. 50 FOREWORDThe International Organization of Legal Metrology ( oiml ) is a worldwide, intergovernmental organization whoseprimary aim is to harmonize the regulations and metrological controls applied by the national metrological services,or related organizations, of its Member two main categories of oiml publications are:1)International Recommendations ( oiml R), which are model regulations that establish the metrologicalcharacteristics required of certain measuring instruments and which specify methods and equipment for check-ing their conformity; the oiml Member States shall implement these Recommendations to the greatest possibleextent.

3 2)International Documents ( oiml D), which are informative in nature and intended to improve the work of themetrological Draft Recommendations and Documents are developed by technical committees or subcommittees whichare formed by the Member States. Certain international and regional institutions also participate on a agreements are established between oiml and certain institutions, such as ISO and IEC, with theobjective of avoiding contradictory requirements; consequently, manufacturers and users of measuring instruments,test laboratories, etc. may apply simultaneously oiml publications and those of other Recommendations and International Documents are published in French (F) and English (E) andare subject to periodic publications may be obtained from the Organization s headquarters:Bureau International de M trologie L gale11, rue Turgot - 75009 Paris - FranceTelephone: 33 (0)1 48 78 12 82 and 42 85 27 11 Fax: 33 (0)1 42 82 17 27 This publication - reference oiml R 107-1, edition 1997 (E) - was developed by the oiml subcommitteeTC 9/SC 2 Automatic weighing instruments.

4 It was sanctioned by the International Conference of Legal Metrology in1996 and supersedes the previous edition dated 1993. 3 ** *TERMINOLOGY(terms and definitions)The terminology used in this Recommendation conforms to the International Vocabu-lary of Basic and General Terms in Metrology(VIM, 1993 edition) and the Vocabulary ofLegal Metrology(VML, 1978 edition). In addition, for the purposes of this Recom-mendation, the following definitions instrumentA measuring instrument that serves to determine the mass of a load by using theaction of to its method of operation, a weighing instrument is classified asautomatic or weighing instrumentAn instrument that weighs without the intervention of an operator and followsa predetermined program of automatic processes characteristic of the totalizing automatic weighing instrument (totalizing hopperweigher)

5 An automatic weighing instrument that weighs a bulk product by dividing itinto discrete loads, determining the mass of each discrete load in sequence,summing the weighing results and delivering the discrete loads to instrumentAn instrument equipped with electronic instrumentA nonautomatic weighing instrument used to determine the mass of the productused as the test load during material : In this Recommendation the term device is applied to any part whichuses any means to perform one or more specific receptorThe part of the instrument intended to receive the load. 4 deviceA device comprised of electronic subassemblies and performing a specific func-tion. An electronic device is usually manufactured as a separate unit and iscapable of being independently subassemblyA part of an electronic device comprised of electronic components and havinga recognizable function of its componentThe smallest physical entity that uses electron or hole conduction in semicon-ductors, gases.

6 Or in a deviceThe part of the instrument that displays the value of a weighing result in unitsof indicating deviceThe part of the instrument that indicates the sum of consecutive loads weighedand discharged to Principal totalization indicating deviceThe part of the instrument that indicates the sum of all the loads weighed anddischarged to Partial totalization indicating deviceThe part of the instrument that indicates the sum of a limited number of consec-utive loads delivered to Supplementary totalization indicating deviceAn indicating device with a scale interval greater than that of the principaltotalization indicating device and indicating the sum of consecutive loadsweighed over a fairly long period of indicating deviceAn indicating device that enables the use of the instrument as a control instru-ment to weigh discrete loads for control deviceThe means used to set the weight indicating device to zero when the load recep-tor is empty.

7 5 Nonautomatic zero-setting deviceA zero-setting device that must be operated Semi-automatic zero-setting device A zero-setting device that operates automatically following a manual Automatic zero-setting deviceA zero-setting device that operates automatically and without the interventionof an deviceThe means to print the value of each discrete load weighed in the load receptor,and/or the sum of consecutive loads weighed and discharged to intervalA value expressed in units of mass that is the difference between: the values corresponding to two consecutive scale marks for analogue indica-tion, or two consecutive indicated values for digital scale interval (dt)The scale interval of a principal totalization indicating scale interval (d)The scale interval on a control indicating cycleThe sequence of weighing operations that includes the following: one delivery of a load to the load receptor, a single weighing operation, the discharge to bulk of a single discrete weighing rangeThe range from minimum capacity to maximum capacity (Max)The largest discrete load that can be weighed capacity (Min)The smallest discrete load that can be weighed automatically.

8 6 loadThe preset value of the load in the load receptor that causes the flow to stop ineach weighing totalized load ( min)The value of the smallest bulk load that can be totalized without exceeding themaximum permissible error when the automatic operation is comprised of dis-crete loads, each within the automatic weighing timeThe time between the moment that power is applied to an instrument and themoment at which the instrument is capable of complying with the and of indicationAn indication allowing the determination of an equilibrium position to a frac-tion of the scale indicationAn indication in which the scale marks are a sequence of aligned figures that donot permit interpolation to a fraction of a scale (of indication)The indication of an instrument minus the (conventional) true value of errorThe error of an instrument under reference intrinsic errorThe intrinsic error of an instrument as determined prior to performance testsand durability difference between the error of indication and the intrinsic error of a weigh-ing 1: Principally, a fault is the result of an undesired change of data con-tained in or flowing through an electronic 2: From the definition it follows that in this Recommendation a fault isa numerical value.

9 7 faultA fault greater than following are not considered to be significant faults: faults that result from simultaneous and mutually independent cause in theinstrument or in its checking facility, faults that imply the impossibility of performing any measurement, transitory faults that are momentary variations in the indications which can-not be interpreted, memorized or transmitted as a measurement result, faults that are so serious that they will inevitably be noticed by those interes-ted in the stability The capability of an instrument to maintain the difference between the indica-tion of weight at maximum capacity and the indication at zero within specifiedlimits over a period of span stability errorA span stability error greater than one half of the absolute value of the maxi-mum permissible error applicable to the and reference quantityA quantity that is not the subject of the measurement but which influences thevalue of the measurand or the indication of the factorAn influence quantity having a value within the specified rated operating condi-tions of the An influence quantity having a value that falls within the limits specified

10 In thisInternational Recommendation but that falls outside the rated operating condi-tions of the operating conditionsConditions of use which give the ranges of the influence quantities for which themetrological characteristics are intended to lie within the specified maximumpermissible conditionsA set of specified values of influence factors fixed to ensure valid intercompar-ison of the results of measurements. 8 testA test carried out on a complete instrument using the type of material that it isintended to testA test carried out on a complete instrument or part of an instrument in whichany part of the weighing operation is testA test to verify that the equipment under test (EUT) is capable of accomplishingits intended stability testA test to verify that the EUT is capable of maintaining its performance charac-teristics over a period of use.


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