Gas meters - Rotary displacement gas meters

This European Standard specifies ranges, construction, performances, output characteristics and testing of rotary displacement gas meters (hereinafter referred to as RD meters or simply meters) for gas volume measurement.
This European Standard applies to rotary displacement gas meters used to measure the volume of fuel gases of the 1st, 2nd and 3rd gas families, the composition of which is specified in EN 437, at a maximum working pressure up to and including16 bar over a gas temperature range of at least -10 °C to +40 °C.
Unless otherwise specified in this standard, all pressures used are gauge pressures.

Gaszähler - Drehkolbengaszähler

Diese Europäische Norm legt den Einsatzbereich, den Bau, den Betrieb, die Ausgabecharakteristiken und die Prüfung von Drehkolbengaszählern (nachfolgend RD-Zähler oder einfach nur Zähler genannt) für die Gasvolumenmessung fest.
Diese Europäische Norm gilt für Drehkolbenzähler, die für die Volumenmessung von Brenngasen der 1., 2. und 3. Gasfamilie, deren Zusammensetzung in EN 437 beschrieben ist, bei einem maximalen Betriebsdruck bis einschließlich 16 bar in einem Gastemperaturbereich von mindestens - 10 °C bis + 40 °C eingesetzt werden.
Soweit in dieser Norm nicht anders angegeben, handelt es sich bei den dargestellten Drücken um Überdrücke.

Compteurs de gaz - Compteurs de gaz a déplacement rotatifs

La présente norme définit les gammes, construction, performances, caractéristiques des sorties et essais des compteurs de mesure de volume de gaz a pistons rotatifs (appelés ci-apres simplement compteurs). La présente norme s'applique aux compteurs de gaz susceptibles de recevoir une approbation de qualification CEN; pour des gaz combustibles de la 1ere, 2eme et 3eme famille de gaz pour des pressions jusqu'a pmax = 16 bar; pour une gamme minimum de température de -10 °C a +40 °C.

Plinomeri - Plinomeri z rotacijskimi bati

General Information

Status
Withdrawn
Publication Date
31-Jan-2004
Withdrawal Date
19-Apr-2015
Technical Committee
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
17-Apr-2015
Due Date
10-May-2015
Completion Date
20-Apr-2015

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gas meters - Rotary displacement gas metersPlinomeri - Plinomeri z rotacijskimi batiCompteurs de gaz - Compteurs de gaz a déplacement rotatifsGaszähler - DrehkolbengaszählerTa slovenski standard je istoveten z:EN 12480:2002SIST EN 12480:2004en91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:SLOVENSKI
STANDARDSIST EN 12480:200401-februar-2004







EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12480February 2002ICS 91.140.40English versionGas meters - Rotary displacement gas metersCompteurs de gaz - Compteurs de gaz à déplacementrotatifsGaszähler - DrehkolbengaszählerThis European Standard was approved by CEN on 16 November 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12480:2002 E



EN 12480:2002 (E)2ContentspageForeword.41SCOPE.52NORMATIVE REFERENCES.53TERMINOLOGY.53.1Terms and definitions.53.2Symbols.84WORKING RANGE.94.1General.94.2Flowrate range.94.3Pressure range.94.4Temperature range.105METROLOGICAL PERFORMANCE.105.1Error of indication.105.1.1Requirements.105.1.2Test115.2Pressure loss.125.2.1Requirements.125.2.2Test125.3Metrological repeatability.125.3.1Requirements.125.3.2Test126CONSTRUCTION AND MATERIAL.126.1General.126.2Material.126.2.1General.126.2.2Resistance to external corrosion.136.2.3Penetration resistance.136.2.4Adhesion of the protective coating.146.3Robustness.146.3.1Resistance to internal pressure.146.3.2Rate of change of pressure.156.3.3External leak tightness.156.3.4Temperature.166.3.5Overload.176.3.6Bending and torsional moment.176.4Connections.196.5Pressure and temperature tappings.246.5.1Pressure tappings.246.5.2Temperature tappings.257METER OUTPUT.257.1Index.257.1.1General.257.1.2Magnetic coupling.267.1.3Mechanical indicating device.267.1.4Test element.267.2Index window.277.2.1General.277.2.2Requirements.277.2.3Tests.277.3Output drive shafts.287.3.1Requirements.287.3.2Tests.297.4Pulse generators.30



EN 12480:2002 (E)37.4.1General.307.4.2Specification for low frequency pulse generator.307.4.3Specification for high frequency pulse generator.317.4.4Electrical Connection.318DURABILITY.318.1Requirements.318.2Tests.319MARKING.329.1General.329.2Direction of
flow.329.3Pressure tappings.329.4Durability and legibility of marking.329.4.1Requirements.329.4.2Indelibility test.32Annex A (normative)
Pattern approval tests.33Annex B (normative)
Individual meter testing.35Annex C (normative)
Resistance to high temperature (optional).36C.1Requirements.36C.2Test.36C.2.1Apparatus.36C.2.2Test conditions.36C.2.3Test procedure.37C.3Marking.38Bibliography.39



EN 12480:2002 (E)4ForewordThis European Standard has been prepared by Technical Committee CEN/TC 237 "Gas meters", the secretariat ofwhich is held by BSI.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by August 2002, and conflicting national standards shall be withdrawn at the latest byAugust 2002.In the preparation of this European Standard, the content of OIML Publication, “International Recommendations 6”and “International Recommendations 32” and the content of member bodies national standards on rotarydisplacement gas meters have been taken into account.The metrological aspects of this European Standard may be subject to amendments to bring it into line with theproposed Measuring Instruments Directive (MID).Electronic Indexes are not specifically covered by this standard, however, work to produce a standard coveringthese devices is in progress under CEN/TC 237.Annexes A, B and C are normative.This standard includes a Bibliography.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.



EN 12480:2002 (E)51 SCOPEThis European Standard specifies ranges, construction, performances, output characteristics and testing of rotarydisplacement gas meters (hereinafter referred to as RD meters or simply meters) for gas volume measurement.This European Standard applies to rotary displacement gas meters used to measure the volume of fuel gases ofthe 1st, 2nd and 3rd gas families, the composition of which is specified in EN 437, at a maximum working pressure upto and including16 bar over a gas temperature range of at least – 10 °C to + 40 °C.Unless otherwise specified in this standard, all pressures used are gauge pressures.2 NORMATIVE REFERENCESThis European Standard incorporates by dated or undated references provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 437, Test gas - Test pressures – Appliance categories.EN 10204, Metallic products - Types of inspection documents.EN 50014, Electrical apparatus for potentially explosive atmospheres - General requirements.EN 50020, Electrical apparatus for potentially explosive atmospheres - Intrinsic safety “i”.EN 60947-5-6,Low voltage switchgear and controlgear – Part 5-6: Control circuit devices and switching elements –DC interface for proximity sensors and switching amplifiers (NAMUR) (IEC 60947-5-6:1999)EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).EN 60730-1:1995, Automatic electrical controls for household and similar use - Part 1: General requirements (IEC60730-1:1993, modified).ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimension, tolerancesand designation.ISO 834-1, Fire resistance tests – Elements of building construction – Part 1: General requirements.ISO 2768-1, General tolerances – Part 1: Tolerances for linear and angular dimensions without individual toleranceindications.ISO 7005-1, Metallic flanges - Part 1 : Steel flanges.ISO 7005-2, Metallic flanges - Part 2 : Cast iron flanges.3 TERMINOLOGY3.1 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply.



EN 12480:2002 (E)63.1.1rotary displacement meter (RD meter)gas volume meter in which a rigid measuring compartment is formed between the walls of a stationary chamberand rotating element or elements. Each rotation cycle of the element(s) displaces a fixed volume of gas which iscumulatively registered and indicated by an indicating device3.1.2actual flowrateflow, at the pressure and temperature conditions prevailing in the gas distribution line in which the meter is fitted3.1.3flowrate rangerange of flowrates of gas limited by the maximum flowrate Qmax and the minimum flowrate Qmin for which theerror of indication of the meter lies within the specified limits (also referred to as "rangeability")3.1.4working pressuredifference between the pressure of the gas at the inlet of the meter and the atmospheric pressure3.1.5maximum working pressure (pmax)upper limit of working pressure for which the meter has been designed, as declared by the manufacturer andmarked on the meter3.1.6metering pressure (pm)absolute pressure at which the volume of the gas is measured3.1.7pressure lossnon-recoverable pressure drop caused by the presence of the meter in the pipeline3.1.8metering conditionsconditions of the gas prevailing at the point of measurement3.1.9base conditionsfixed conditions to which a volume of gas is converted, having been initially measured at prevailing meteringconditions3.1.10specified conditionscondition of the gas at which the performance specifications of the meter are given3.1.11normal conditions of useconditions referring to the meter operating : at an inlet pressure up to the maximum working pressure within the range of flow rates within the operational temperature and gas temperature range with the distributed gas3.1.12operational temperature rangerange of temperatures for which the meter satisfies the requirements of this specification



EN 12480:2002 (E)73.1.13storage temperature rangerange of temperatures at which the meter can be stored without being adversely affected3.1.14transitional flowrate (Qt)rate of flow at which the maximum permissible error of indication changes3.1.15cyclic volumevolume of the gas measured by one complete revolution of the element(s)3.1.16error of indicationvalue which shows the relationship in percentage terms of the difference between the volume indicated by themeter and the volume which has actually flowed through the meter, to the latter value :whereVi is the indicated volume and Vc is the volume which has actually flowed through the meter3.1.17normal ambient conditionsa pressure of (1 013,25
100) mbar and temperature of (20
5) C 100
= cciVVVE



EN 12480:2002 (E)83.2 SymbolsTable 1 Represented quantitySI UnitDNpQVTEUBIDiameterAbsolute pressureVolume flowrateVolumeTemperatureErrorDensity of gasBattery voltageCurrentdimensionlessPa, barm³/hm³°C%kgm-³VAmbtciSUBSCRIPTS:Metering conditions of the gasBase conditionsTransitionalactualindicated



EN 12480:2002 (E)94 WORKING RANGE4.1 GeneralThe values of maximum flow rates and the corresponding values of the upper limits of the minimum flow rates shallbe one of those given in Table 2, when the meter is tested with air of density approximately 1,2 kgm-³.4.2 Flowrate rangeThe declared values of the maximum flowrate and the corresponding minimum flowrate of rotary displacement gasmeters are given in the Table 2.In addition, decimal multiples and sub-multiples of the values given in the last five rows of Table 2 can be used.Table 2 Flowrate rangeQmax1:101:201:301:501:651:1001:1601:2001:250(m3/h)Qmin
(m3/h)161,60,80,50,30,250,160,100,080,065252,51,30,80,50,40,250,160,130,1040421,30,80,650,40,250,20,16656,53,221,310,650,40,30,251001053,221,610,650,50,416016853,22,51,610,80,6525025138542,51,61,3140040201386,542,52,01,665065322013106,543,22,51 00010050322016106,5541 60016080503225161086,52 500250130805040251613104 0004002001308065402520166 500650320200130100654032254.3 Pressure rangeThe pressure range shall be from the atmospheric pressure to the maximum allowable working pressure stated bymanufacturer and shall be marked on the meter.



EN 12480:2002 (E)104.4 Temperature rangeAll meters shall be capable of meeting the requirements for operational and gas temperature range, according toTC1/TC2 classes (see Table 3), as declared by the manufacturer.Table 3 TemperatureclassOperationaltemperature range°CStoragetemperature range°CTC1TC2- 10 / + 40- 25 / + 55- 20 / + 60- 25 / + 605 METROLOGICAL PERFORMANCE5.1 Error of indication5.1.1 RequirementsWhen tested in accordance with 5.1.2, the meter error of indication shall be within the limits specified in Table 4.Table 4 Flow rate Qm³/hMaximum permissible errorsQmin
Q < QtQt
Q
Qmax 2 % 1 %Transitional flowrate values, Qt, are given in Table 5:



EN 12480:2002 (E)11Table 5 Flowrate rangeQt 1: 20
1: 30
1: 50> 1: 500,20 Qmax0,15 Qmax0,10 Qmax0,05 QmaxEach meter shall be adjusted so that the "weighted mean error" (WME) is as close to zero as the adjustment andthe maximum permissible errors allow.The WME shall have a value between -0,4 % and +0,4 %.The WME is calculated as follows:Where:Qi /Qmax is a weighting factor;Ei is the error of indication at the flow rate QI given as a percentage.When Qi = Qmax a weighting factor of 0,4 instead of 1 shall be used.5.1.2 TestThe test is carried out using air (density 1,2 kgm-³), or gas specified in the scope, at normal ambient conditions.The meter is tested at the following flow rates ( 10 %):a)type test:1)for meters with flowrate range between 1:10 to 1:30:Qmin; 0,05 Qmax; 0,1Qmax (when these values are larger than Qmin); 0,25 Qmax; 0,4 Qmax;0,7Qmax; Qmax.2)for meters with a flowrate range
1:50: Qmin; 0,05 Qmax; 0,15 Qmax; 0,25 Qmax; 0,40 Qmax; 0,70 Qmax; Qmax.b)individual factory testing for error of indication (every meter shall be tested): Qmin; 0,25 Qmax; Qmax.) /(
) /(
= maxiimaxiQQEQQWME



EN 12480:2002 (E)12When requested by the customer, the error of indication test can be carried out at specified conditions(close to the operational conditions).5.2 Pressure loss5.2.1 RequirementsThe maximum pressure loss at Qmax, when using air with density 1,2 kgm-³, shall be declared by themanufacturer.5.2.2 TestThe pressure loss shall be measured between a point 1 DN upstream and a point 1 DN downstream of the meter,on piping of the same DN as the meter.Care shall be taken on selection and manufacturing of the pressure tappings to ensure that flow pattern distortionsdo not affect the pressure readings.5.3 Metrological repeatability5.3.1 RequirementsIn the flow rate range from Qt to Qmax the variation of the error of indication of the meter at each flow rate shallstay within a span of 0,2 %.5.3.2 TestThe error of indication of the meter is determined at two flow rates in the following order: Qt, Qmax, Qt, Qmax, Qt,Qmax, where the change from Qt to Qmax is done via 1,10 Qmax, in order to approach Qmax from a higher flowrate.At each flow rate the error is determined three times without changing the flow rate. The cycle is repeated threetimes. The test shall be carried out with air, or gas, at atmospheric conditions ( 100 mbar).Check that the nine resulting errors of indication at each flow rate are within a span of 0,2 %, excluding anyinteraction between the meter and the test bench.6 CONSTRUCTION AND MATERIAL6.1 GeneralThe gas meter shall be constructed in such a way that any mechanical interference, capable of affecting the metererror of indication, results in permanently visible damage to the meter, or its sealing or protection marks.6.2 Material6.2.1 GeneralThe meter body and the internal mechanism shall be manufactured of materials suitable for the service conditions,and resistant to attack from the fluids which may pass through the meter. Exterior surfaces of the meter shall be protected, if necessary, against corrosion.The meter body and all other parts shall be constructed of sound materials designed to handle the pressure andtemperatures for which they are rated.



EN 12480:2002 (E)136.2.2 Resistance to external corrosionAll parts of the meter shall be able to resist any corrosive substances contained in the external atmosphere withwhich they may be in contact during normal conditions of use.Where necessary, meters shall be provided with a suitable coating to protect against corrosion. Any such protectivecoating shall meet the requirements of 6.2.3 and 6.2.4.6.2.3 Penetration resistance6.2.3.1 Requirements After the test described in 6.2.3.2, the base material shall not be exposed.6.2.3.2 TestThe penetration resistance of the protective coating is assessed using the apparatus described in Figure 1, with aspring loading of 29,4 N.NOTEThe scratching element of the apparatus is a 1 mm steel ball that is mounted by soft soldering in a spring loadedhousing. The crocodile clip is attached to the meter connection and the apparatus is drawn evenly over the surface under test ata speed of 30 mms-1 to 40 mms-1 keeping the apparatus upright and pressed to the surface throughout the movement.Figure 1 — Penetration resistance test apparatus



EN 12480:2002 (E)14Where a metallic protective coating is applied directly onto a metal surface, the indicator lamp will light without anypenetration of the surface. In this case, the surface shall be visually inspected for penetration.The ball shall be cleaned after each test and inspected to ensure that it complies with the specification. Checkperiodically that the spring loading complies with the specification.6.2.4 Adhesion of the protective coating6.2.4.1 RequirementsWhen tested in accordance with the 6.2.4.2, there shall be no detachment of any complete protective coated"square".6.2.4.2 TestThe protective coated surface of the meter or representative sample is scored through at 1 mm intervals in a seriesof lines at 90°. A surface cross-scored with 100 squares each of 1 mm length is produced. Adhesive tape is stuck to the cross-scored surface and is then removed with a sharp pull.6.3 Robustness6.3.1 Resistance to internal pressure6.3.1.1 RequirementsThe meter case shall be designed to withstand the internal pressure using a recognised appropriate safety factorfor the case material and maximum working pressure. Alternatively, it shall be tested to ensure it has sufficientstrength to operate in safety. The meter casing type test is specified in 6.3.1.2.An index window which, in normal operation, is subjected to the gas pressure shall be tested for soundness withthe casing.Each meter casing and all other parts forming the pressure containing structure of the meter shall be subjected tothe strength test specified in 6.3.1.3. A certificate according to EN 10204 shall be delivered by the manufacturerwith each meter certifying conformity with this clause.6.3.1.2 Type test Option 1 :Records of all design calculations shall be available for inspection to ensure that the materials and design of themeter case comply with a recognised standard. The design calculation shall fulfil the strength requirements at theminimum and maximum temperature according to the temperature class of the meter as described in 4.4. Option 2 :A hydrostatic test shall be performed at a pressure of at least four times the maximum working pressure, or 2 bar,whichever is the greater. In this test the pressure shall be maintained continuously for 30 min without the caseyielding. The test shall be performed at a temperature of (20
5) °C (nominal) and the procedures and results shallbe recorded and available. For each nominal diameter, one sample meter shall be tested.6.3.1.3 Individual factory
testingThe test equipment shall not subject the meter to external applied stress which may significantly affect the result ofthis test.



EN 12480:2002 (E)15At the discretion of the test facility, the test can be carried out with water, kerosene or any other suitable liquidhaving a viscosity not greater than that of the water; or with gas (air or any other suitable gas).The meter shall be free of entrapped air when testing with a liquid.The test shall be performed at a minimum internal pressure of 1,5 times the maximum working pressure with aminimum of 2 bar.The test shall be performed by applying pressure inside the assembled meter casing with the connection closed.Detectable leakage through the casing is not acceptable. The test duration shall be 180 s.If pressure tests i
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