EUROPEAN STANDARD EN 29104 NORME EUROPEENNE EUROPAISCHE NORM June 1993 I UDC 532.57.082.74:532.542 Descriptors:Liguid flow,pipeflow,flowmeasurement.electromagnetic equipment,flowmeters.tests.performancetests English version Measurement of fluid flow in closed conduits Methods of evaluating the performance of electromagnetic flow-meters for liquids (ISO 9104:1991) Mesure de débit des fluides dans les conduites Durchflumessung von Fluiden in fermées Methodes d'évaluation de la geschlossenen Leitungen Verfahren zur performance des débitmetres Beurteilung des Betriebsverhaltens von électromagnétiques utilisés pour les liquides magnetisch-induktiven DurchfluBmeBgeraten (IS0 9104:1991) fur Flüssigkeiten (ISO 9104:1991) This European Standard was approved by CEN on 1993-06-18. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. The European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CentralSecretariathasthesamestatusastheofficialversions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comite Européen de Normalisation Europaisches Komitee fur Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels @ 1993 Copyright reserved to CEN members Ref. No. EN 29104:1993 E EN 29104:1993 Foreword Contents In 1991, IS0 9104:1991 Measurement of fluid flow Page in closed conduits - Methods of evaluating the Foreword 2 performance of electromagnetic flow-meters for Introduction 3 liquids was submitted to the CEN Primary Questionnaire procedure. 1 Scope 3 Following Resolution BT C 42/1992, ISO 9104:1991 2 Normative references was submitted to the formal vote; the result was 3 Definitions 4 positive. 4 General testing procedure 4 This European Standard shall be given the status of 5 Evaluation of the effect of an a national standard, either by publication of an influence quality 8 identical text or by endorsement, at the latest by 6 Tests for the evaluation of the December 1993, and conflicting national standards effects of other influence quantities 16 shall be withdrawn at the latest by December 1993. Annex A (informative) Bibliography 19 AccordingtotheCEN/CENELECInternal Regulations, the following countries are bound to Annex ZA (normative) Normative references implement this European Standard: Austria to international publications with their Belgium, Denmark, Finland, France, Germany, relevant European publications 20 Greece, Iceland, Ireland, Italy, Luxembourg, Figure 1 - Sample calibration showing Netherlands, Norway, Portugal, Spain, Sweden, distribution of test points 8 Switzerland and the United Kingdom. Figure 2 - Typical circuit arrangements NOTE The European references to international publications for upstream gate valve tests 9 are given in Annex ZA (normative). Figure 3 - Examples showing the effect of an upstream gate valve on three electromagnetic meters of DN 500 (based on real data) 11 Figure 4 - Annular or segmental obstructions used to determine the effects of a disturbance in the inlet flow on the response of the flow-meter 13 Figure 5 - General test circuit 14 Figure 6 - Test of the effect of a) mains frequency common-mode voltage (voltage applied between the earth of the primary and secondary devices) and b) mains frequency voltage between neutral and primary earth (voltage applied between earth and mains, if practicable) 15 Figure 7 - Te