Guide for Measuring Instruments Directive 2004/22/EC
Contents
1. Directive 2004 22 EC OIML R 138 Comments Conclusion 2007 Essential requirements of Annex I and Annex MI 008 II fee Every vessel for commercial transactions shall bear a mark identifying 9 1 7 measuring instrument shall bear the aon the company responsible for compliance with the metrological Covered when the ollowing inscriptions fication licable to th I reference temperature manufacturer s mark or name a a a is 20 C information in respect of its accuracy plus when applicable 5 2 1 Every vessel for commercial transactions shall bear a clearly visible Covered however see nformation in respect of the conditions easily readable and permanent indication of the nominal capacity Vn 9 7 of use Markings shall be in SI units measuring capacity measuring range identity marking 525 If the National Metrology Authority decides on a reference temperature number of EC type examination other than 20 TC this temperature must be indicated next to every certificate or the EC design examination volume indication affixed to the vessel certificate information whether or not additional i devices providing metrological results A Not required see preamble to MI 008 II comply with the provisions of this 1 1 of MI 008 Chapter II requires a reference temperature of 20 C Directive on legal metrological control 9 2 An instrument of dimensions too small or Not relevant of too sensitive a composition to allow it to be2. 1 4 When carrying out the tests as envisaged in this Directive the following paragraphs apply Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion 1 4 1 Basic rules for testing and the determination of errors Essential requirements specified in 1 1 and 1 2 shall be verified for each relevant influence quantity Unless otherwise specified in the appropriate instrument specific annex these essential requirements apply when each influence quantity is applied and its effect evaluated separately all other influence quantities being kept relatively constant at their reference value Metrological tests shall be carried out during or after the application of the influence quantity whichever condition corresponds to the normal operational status of the instrument when that influence quantity is likely to occur Not relevant 1 4 2 Ambient humidity According to the climatic operating environment in which the instrument is intended to be used either the damp heat steady state non condensing or damp heat cyclic condensing test may be appropriate The damp heat cyclic test is appropriate where condensation is important or when penetration of vapour will be accelerated by the effect of breathing In conditions where non condensing humidity is a factor the damp heat steady state is appropriate
3. 7 4 Where a measuring instrument is designed for the measurement of values of the measurand that are constant over time the measuring instrument shall be insensitive to small fluctuations of the value of the measurand or shall take Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion appropriate action 7 5 A measuring instrument shall be robust and its materials of construction shall be suitable for the conditions in which it is intended to be used 4 2 The vessels shall be sufficiently robust to withstand normal usage without distortions Covered 7 6 A measuring instrument shall be designed so as to allow the control of the measuring tasks after the instrument has been placed on the market and put into use If necessary special equipment or software for this control shall be part of the instrument The test procedure shall be described in the operation manual When a measuring instrument has associated software which provides other functions besides the measuring function the software that is critical for the metrological characteristics shall be identifiable and shall not be inadmissibly influenced by the associated software Not relevant Protection against corruption 8 1 The metrological characteristics of a measuring instrument shall not be influenced in an
4. Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion Reproducibility The application of the same measurand in a different location or by different user all other conditions being the same shall result in the close agreement of successive measurements The difference between the measurement results shall be small when compared with the MPE Not covered Repeatability The application of the same measurand under the same conditions of measurement shall result in the close agreement of successive measurements The difference between the measurement results shall be small when compared with the MPE Not covered Discrimination and sensitivity A measuring instrument shall be sufficiently sensitive and the discrimination threshold shall be sufficiently low for the intended measurement task 4 4 Vessels with gauge marks shall be so designed that at the nominal capacity a variation in the contents equal to the maximum permissible error causes a change in the liquid level of at least 2 mm Covered Durability A measuring instrument shall be designed to maintain an adequate stability of its metrological characteristics over a period of time estimated by the manufacturer s instruction when in the environmental conditions for which it is intended 4 2 The vessels shall be sufficiently robus
5. purposes can be remotely read it shall in any case be fitted with a metrologically controlled display accessible without tools to the customer The reading of this display is the measurement result that serves as the basis for the price to pay Not relevant 11 Further processing of data to conclude the trading transaction A measuring instrument other than a utility measuring instrument shall record by a durable means the measurement result accompanied by information to identify the particular transaction when the measurement is non repeatable the measuring instrument is normally intended for use in the absence of one of the trading parties Not relevant Additionally a durable proof of the measurement result and the information to identify the transaction shall be available on request at the time the measurement is concluded Not relevant 12 Conformity evaluation A measuring instrument shall be Itis achieved by complying to OIML R 138 Covered Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion designed so as to allow ready evaluation of its conformity with the appropriate requirements of this Directive ANNEX MI 008 CHAPTER II The relevant essential requirements of Annex and the specific requirements and the conformity assessment procedures listed in this chapter apply to capa
6. a Mechanical environments are classified into classes M1 to M3 as described below M1 This class applies to instruments used in locations with vibration and shocks of low significance e g for instruments fastened to light structures subject to negligible vibrations and shocks transmitted from local blasting or pile driving activities slamming doors etc M2 This class applies to instruments used in locations with significant or high levels of vibration and shock e g transmitted from machines and passing vehicles in the vicinity or adjacent to heavy machines conveyor belts etc M3 This class applies to instruments used in locations where the level of vibration and shock is high and very high e g for instruments mounted directly on machines conveyor belts etc Not relevant b The following influence quantities shall be considered in relation with mechanical environments Vibration Mechanical shock Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion 1 3 3 a Electromagnetic environments are classified into E1 E2 or E3 as described below unless otherwise laid down in the appropriate instrument specific annexes E1 This class applies to instruments used in locations with electromagnetic disturbances corresponding to those likely to be found in residential commercial and light indu
7. WELMEC 8 18 2 WELMEC European cooperation in legal metrology Guide for Measuring Instruments Directive 2004 22 EC Capacity Serving Measures Corresponding Tables OIML R 138 2007 MID 008 II December 2008 WELMEC European cooperation in legal metrology WELMEC is a co operation between the legal metrology services of the Member States of the European Union and EFTA This document is the introduction to WELMEC WELMEC is publishing a number of Guides to provide guidance to manufacturers of measuring instruments and to notified bodies responsible for conformity assessment of their products The Guides are purely advisory and do not themselves impose any restrictions or additional technical requirements beyond those contained in relevant EC Directives Alternative approaches may be acceptable but the guidance provided in these documents are representing the considered view of WELMEC as to the best practice to be followed Published by WELMEC Secretariat BEV Schiffamtsgasse 1 3 A 1020 Vienna Austria Tel 43 1211 102711 Fax 43 1 211 10 4701 E mail welmec bev gqv at Website www welmec org Notes 2 Capacity serving measures Cross Reference Table 2004 22 EC vs OIML R 138 2007 The column Comments indicates when necessary the relevant text of OIML R 138 and related explanations concerning the compliance with relevant MID requirement The column Conclusion gives the conclusion o
8. ar the relevant information shall have its packaging if any and the accompanying documents required by the provisions of this Directive suitably marked 9 3 The instrument shall be accompanied by Not relevant information on its operation unless the simplicity of the measuring instrument makes this unnecessary Information shall be easily understandable and shall include where relevant rated operating conditions mechanical and electromagnetic Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion environment classes the upper and lower temperature limit whether condensation is possible or not open or closed location instructions for installation maintenance repairs permissible adjustments instructions for correct operation and any special conditions use conditions for compatibility with interfaces sub assemblies or measuring instruments 9 4 Groups of identical measuring instruments used in the same location or used for utility measurements do not necessarily require individual instruction manuals Capacity serving measures do not need user manual to be utilized Not relevant 9 5 Unless specified otherwise in an instrument specific annex the scale interval for a measured value shall be in the form 1x10 2x10 or 5x10 where n is any integer or zero The unit of measurement or its symbol s
9. city serving measures defined below However the requirement for the supply of a copy of declarations of conformity may be interpreted as applying to a batch or consignment rather than each individual instrument Also the requirement for the instrument to bear information in respect of its accuracy shall not apply Definitions Capacity serving measure A capacity measure such as a drinking glass jug or thimble measure designed to determine a specified volume of a liquid other than a pharmaceutical product which is sold for immediate consumption 2 2 Measures which are filled as required and used for the retail sale of drinks sold by volume They are divided into two categories transfer measures used solely for decanting specific volumes of beverages and drinking measures used also for the consumption of specific volumes of beverages Covered Directive 2004 22 EC OIML R 138 Comments Conclusion 2007 Essential requirements of Annex I and Annex MI 008 II Line measure Gauge mark Covered when gauge a Mark generally a line that indicates the nominal capacity mark in a line A capacity serving measure marked with g y pacny a line to indicate nominal capacity Brim measure 27 Brim capacity Vr Covered A capacity serving measure for which the Volume that the vessel is meant to contain when filled to the brim internal volume is equal to the nominal capacity Transfer
10. hall be shown close to the numerical value Capacity serving measures do not have scale intervals Not relevant 9 6 A material measure shall be marked with a nominal value or a scale accompanied by the unit of measurement used 5 2 1 Every vessel for commercial transactions shall bear a clearly visible easily readable and permanent indication of the nominal capacity Vn Markings shall be in SI units Covered however see 9 7 9 7 The units of measurement used and their symbols shall be in accordance with the provisions of Community legislation on units of measurement and their symbols The units of measurement shall be the SI units Imperial units not covered Covered when units are SI Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion 9 8 All marks and inscriptions required under any requirement shall be clear non erasable unambiguous and non transferable 5 2 1 Every vessel for commercial transactions shall bear a clearly visible easily readable and permanent indication of the nominal capacity Vn Markings shall be in SI units The Non transferability requirement is not referred to in the OIML R 138 It is considered to be met by the requirement that the indication should be permanent Covered however see 9 7 10 Indication of result 10 1 Indicat
11. ion of the result shall be by means of a display or a hard copy Not relevant 10 2 The indication of any result shall be clear and unambiguous and accompanied by such marks and inscriptions necessary to inform the user of the significance of the result Easy reading of the present result shall be permitted under normal conditions of use Additional indications may be shown provided they cannot be confused with the metrologically controlled indications 5 2 1 Every vessel for commercial transactions shall bear a clearly visible easily readable and permanent indication of the nominal capacity Vn Markings shall be in SI units Covered however see 9 7 10 3 In the case of hard copy the print or record shall also be easily legible and non erasable Not relevant 10 4 A measuring instrument for direct sales trading transactions shall be designed to present the measurement result to both parties in the transaction when installed as intended When critical in case of direct sales any ticket provided to the consumer by an ancillary device not Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion complying with the appropriate requirements of this Directive shall bear an appropriate restrictive information 10 5 Whether or not a measuring instrument intended for utility measurement
12. least 2 mm Smat the brim or filing mark Brim are not considered in OIML R 138 4 2 Transfer measures shall be designed so Mo sue roquirerent ITAIM Arise Not covered that the complete discharge of the liquid being measured will not be impeded 5 Marking 5 2 1 Nominal capacity a Let heer Soka ari ray be Every vessel for commercial transactions shall bear a clearly visible m Paa SeS pa d re y easily readable and permanent indication of the nominal capacity Vn i Markings shall be in SI units 52 Capacity serving measures may also be 529 7 ue y the ae of 7 2 1 capacity serving measures Covered when ther marked with up to three clearly Bilal eer at GASI One MINgman are no more than 3 Sra oat os anata ati OIML R 138 does not limit the number of mark to 3 af least one capacities marked 53 All filling marks shall be sufficiently clear 4 2 The vessels shall be sufficiently robust to withstand normal usage Covered without distortions Piae on oo that MPEs are not For capacity serving measures and measuring container bottles the s materials used in construction should be sufficiently tough rigid non porous and stable to maintain accuracy during use 5 2 2 All filing marks shall be clearly visible and permanently marked
13. measure 2 2 Measures which are filled as required and used for the retail sale of Covered Acapadity servina measnre trom whichiit drinks sold by volume They are divided into two categories transfer i ee aad that h iauid is decanted measures used solely for decanting specific volumes of beverages and dor to consumption q drinking measures used also for the consumption of specific volumes of p pron beverages Capacity 2 5 Nominal capacity Vn Covered The capacity is the internal volume for Volume indicated on the vessel brim measures or internal volume to a filling mark for line measures 2 7 Brim capacity Vr Volume that the vessel is meant to contain when filled to the brim 2 9 Gauge mark Mark generally a line that indicates the nominal capacity 4 6 1 Vessels with gauge marks Filled to the gauge mark is when the lowest part of the meniscus formed by the liquid is tangential to the upper edge of the gauge mark Reference Conditions Directive 2004 22 EC OIML R 138 Comments Conclusion 2007 Essential requirements of Annex I and Annex MI 008 II i Reference temperature If the national authority for metrology decides ia Urea satel rads 5 2 5 on a reference temperature other than 20 C this temperature must be Peia HA pacity i indicated next to every volume indication affixed on the vessel is 20 E aro T E ee ee Vertical positi
14. n the compliance between MID and OIML R 138 for the relevant requirement The indication Covered means that the requirement of OIML R 138 is identical to the one of MID or the requirement of OIML R 138 is more severe than the one of MID or All the requirement of OIML R 138 fulfils MID requirements even when MID allows other alternatives In case the requirement is not fully covered a short statement explains what is covered The indication Not Covered means that the MID requirement is either not compatible with the relevant OIML R 138 requirement or not included in OIML R 138 The indication Not relevant means that the MID Annex 1 requirement is not relevant for capacity serving measures Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion ANNEX 1 1 1 Allowable Errors Under rated operation conditions and in absence of a disturbance the error of measurement shall not exceed the maximum permissible error MPE value as laid down in the appropriate instrument specific requirements Unless stated otherwise in the instrument specific annexes MPE is expressed as a bilateral value of the deviation from the true measurement value 5 1 Covered 1 2 Under rated operating conditions and in presence of a disturbance the performance requirement shall be as laid down in the appropriate instrument specific requirement
15. on M2 Paci va Lit a Teg 7 Vessels with gauge marks and measuring container bottles shall have Covered 9 a base wide enough to allow a vertical stable position when resting on a flat horizontal surface If not the holder must be provided with the vessel 2 MPEs 5 1 1 4 1 1 Exactly the same MPE Nominal capacity limited by formula Covered Table 1 Note For brim measures the sign indicates that the measure Capacity Line Brim contains at least the brim capacity Vr up to a maximum of Vr MPE Transfer measures lt 100 ml 0 4ml 2100 ml 0 6 Serving measures lt 200ml 5 0 10 2200 ml 5ml 2 5 0 10m 5 4 2 The vessels shall be sufficiently robust to withstand normal usage 3 Marena without distortions For capacity serving measures and measuring Covered C it hall b container bottles the materials used in construction should be eared bei fiche i sufficiently tough rigid non porous and stable to maintain accuracy rigid and dimensionally stable to maintain dunn use capacity within the MPE 4 Shape Directive 2004 22 EC OIML R 138 Comments Conclusion 2007 Essential requirements of Annex I and Annex MI 008 II Vessels with gauge marks shall be so designed that at the nominal ee ut Spa a oes separa capacity a variation in the contents equal to the maximum permissible Covered MPE peli a chanaein se of atleast error causes a change in the liquid level of at
16. s Where the instrument is intended to be used in a specified permanent continuous electromagnetic field the permitted performance during the radiated electromagnetic field amplitude modulated test shall be within MPE Not relevant 1 3 The manufacturer shall specify the climatic mechanical and electromagnetic environments in which the instrument is intended to be used power supply and other influence quantities likely to affect Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion its accuracy taking into account of the requirements laid down in the appropriate instrument specific annexes 1 3 1 Climatic environments The manufacturer shall specify the upper temperature limit and the lower temperature limit from any of the values in Table 1 unless otherwise specified in the Annexes MI 001 to MI 010 and indicate whether the instrument is designed for condensing or non condensing humidity as well as the intended location for the instrument i e open or closed Temperature limits Upper 30 C 40 C 55 C 70 C temperature limit Lower 5 C 10 C 25 C 40 C temperature limit Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion 1 3 2
17. strial buildings E2 This class applies to instruments used in locations with electromagnetic disturbances corresponding to those likely to be found in other industrial buildings E3 This class applies to instruments supplied by the battery of a vehicle Such instruments shall comply with the requirements of E2 and the following additional requirements voltage reductions caused by energising the starter motor circuits of internal combustion engines load dump transients occurring in the event of a discharged battery being disconnected while the engine is running Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion b The following influence quantities shall be considered in relation with electromagnetic environments voltage interruptions short voltage reductions voltage transients on supply lines and or signal lines electrostatic discharges radio frequency electromagnetic fields conducted radio frequency electromagnetic fields on supply lines and or signal lines surges on supply lines and or signal lines Not relevant 1 3 4 Other influence quantities to be considered where appropriate are voltage variation mains frequency variation power frequency magnetic fields any other quantity likely to influence in a significant way the accuracy of the instrument Not relevant
18. t to withstand normal usage without distortions Covered Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion Reliability A measuring instrument shall be designed to reduce as far as possible the effect of a defect that would lead to an inaccurate measurement result unless the presence of such a defect is obvious Suitability 7 1 A measuring instrument shall have no feature likely to facilitate fraudulent use whereas possibilities for unintentional misuse shall be minimal Not covered 7 2 A measuring instrument shall be suitable for its intended use taking account of the practical working conditions and shall not require unreasonable demands of the user in order to obtain a correct measurement result 4 2 The vessels shall be sufficiently robust to withstand normal usage without distortions For capacity serving measures and measuring container bottles the materials used in construction should be sufficiently tough rigid non porous and stable to maintain accuracy during use Vessels used only once such as thin plastic or cardboard drinking capacities must remain accurate during nominal filling transportation and discharge functions Covered 7 3 The errors of a utility measuring instrument at flows or currents outside the controlled range shall not be unduly biased Not relevant
19. y inadmissible way by the connection to it of another device by any feature of the connected device itself or by any remote device that communicates with the measuring instrument Not relevant Directive 2004 22 EC Essential requirements of Annex and Annex MI 008 II OIML R 138 2007 Comments Conclusion 8 2 A hardware component that is critical for metrological characteristics shall be designed so that it can be secured Security measures foreseen shall provide for evidence of an intervention Not relevant 8 3 Software that is critical for metrological characteristics shall be identified as such and shall be secured Software identification shall be easily provided by the measuring instrument Evidence of an intervention shall be available for a reasonable period of time Not relevant 8 4 Measurement data software that is critical for measurement characteristics and metrologically important parameters stored or transmitted shall be adequately protected against accidental or intentional corruption Not relevant 8 5 For utility measuring instruments the display of the total quantity supplied or the displays from which the total quantity supplied can be derived whole or partial reference to which is the basis for payment shall not be able to be reset during use Not relevant Information to be borne by and to accompany the instrument
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