EN 12405:2002
(Main)Gas meters - Gas-volume electronic conversion devices
Gas meters - Gas-volume electronic conversion devices
This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of gas-volume electronic conversion devices associated to gas meters, used to measure volumes of fuel gases of the 1st and 2nd families according to EN 437.
Only three kinds of conversion are treated in this standard:
- conversion as a function of temperature only (called T conversion);
- conversion as a function of the pressure and of the temperature with constant compressibility factor (called PT conversion);
- conversion as a function of the pressure, the temperature and taking into account the compressibility factor (called PTZ conversion).
These gas-volume conversion devices consist of a calculator and a temperature transducer or a calculator, a temperature transducer and a pressure transducer locally installed.
Any conversion device can provide an error curve correction for a gas meter.
NOTE When rendering an account to an end user the readings from the conversion device can be used in conjunction with the readings from a gas meter conforming to EN 1359, prEN 12480, or prEN 12261, as appropriate, or to any other appropriate and relevant international or national standard for gas meters, without prejudice of national regulations.
This standard is intended for type testing only.
Annex A is normative and annex B is informative.
Gaszähler - Elektronische Zustands-Mengenumwerter
Diese Europäische Norm legt die Anforderungen an Herstellung, Leistungsumfang, Sicherheit und Konformität elektronischer, am Gaszähler angeschlossener Zustands-Mengenumwerter, die für die Mengenmessung von Brenngasen der ersten und zweiten Gasfamilie nach EN 437 eingesetzt werden, sowie deren Prüfung fest.
Es werden nur drei Arten der Umwertung in dieser Norm behandelt:
¾ die Umwertung als reine Temperaturfunktion (T-Umwertung);
¾ die Umwertung als Funktion von Druck und Temperatur mit einem konstanten Realgasfaktor (PT-Umwertung);
¾ die Umwertung als Funktion von Druck, Temperatur und Realgasfaktor (PTZ-Umwertung).
Diese Zustands-Mengenumwerter bestehen aus einem Rechner und einem Temperatur-mess-umfor-mer oder aus einem Rechner, einem Temperaturmessumformer und einem Druckmessumformer und sind in der Messanlage installiert.
Alle Zustands-Mengenumwerter können auch Einrichtungen für die Korrektur der Fehler-kurve des Gaszählers enthalten.
ANMERKUNG Die Zählerstandsablesungen vom Zustands-Mengenumwerter können in Verbindung mit den Zählerstandsablesungen von Gaszählern, die EN 1359, prEN 12480 oder prEN 12261 oder anderen passenden und relevanten internationalen oder nationalen Normen für Gaszähler entsprechen, ohne Vorbehalt bezüglich nationaler Regelungen für die Rechnungstellung an Endverbraucher genutzt werden
Diese Norm dient nur der Bauartprüfung.
Compteurs de gaz - Dispositifs électroniques de conversion de volume de gaz
La présente Norme européenne établit les exigences et les essais pour la construction, les performances, la sécurité et la conformité des dispositifs électroniques de conversion de volume de gaz associés à des compteurs de gaz, utilisés pour la mesure de volume de gaz combustibles des première et deuxième familles telles que définies dans l'EN 437.
La présente norme traite uniquement des trois types de conversion suivants :
¾ conversion en fonction de la température seule (appelée conversion T) ;
¾ conversion en fonction de la pression et de la température avec un facteur de compressibilité constant (appelée conversion PT) ;
¾ conversion en fonction de la pression, de la température et qui tient compte du facteur de compressibilité (appelée conversion PTZ).
Ces dispositifs de conversion sont constitués d'un calculateur et d'un transducteur de température ou d'un calculateur, d'un transducteur de température et d'un transducteur de pression installé localement.
Tout dispositif de conversion peut comporter une correction des erreurs du compteur.
NOTE Lors de la présentation des comptes à l'utilisateur final, les mesurages issus du dispositif de conversion peuvent être utilisés conjointement avec les mesurages issus d'un compteur de volume de gaz conforme à l'une des normes suivantes, EN 1359, prEN 12480 ou prEN 12261 suivant le cas, ou à toute autre norme nationale ou internationale appropriée et applicable sur les compteurs de volume de gaz, dans le respect des réglementations nationales.
La présente norme est destinée aux essais de type.
Plinomeri - Elektronski korektorji
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Plinomeri - Elektronski korektorjiGaszähler - Elektronische Zustands-MengenumwerterCompteurs de gaz - Dispositifs électroniques de conversion de volume de gazGas meters - Gas-volume electronic conversion devices91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12405:2002SIST EN 12405:2004en01-februar-2004SIST EN 12405:2004SLOVENSKI
STANDARD
SIST EN 12405:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12405July 2002ICS 91.140.40English versionGas meters - Gas-volume electronic conversion devicesCompteurs de gaz - Dispositifs électroniques de conversionde volume de gazGaszähler - Elektronische Zustands-MengenumwerterThis European Standard was approved by CEN on 25 March 2002.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 12405:2002 ESIST EN 12405:2004
EN 12405:2002 (E)2ContentspageForeword.41Scope.52Normative references.53Terms, definitions and symbols.63.1Terms and definitions.63.2Symbols.94Principle of measurement.114.1Conversion as a function of temperature.114.2Conversion as a function of pressure and temperature.114.3Conversion as a function of pressure, temperature and deviation from the ideal gas law.124.4Correction of the volume at measurement conditions.125Rated operating conditions.135.1Specified field of measurement.135.1.1Specified measurement range for gas pressure.135.1.2Specified measurement range for gas temperature.135.1.3Gas characteristics.135.2Environmental class.135.2.1Ambient temperature range.135.2.2Humidity range.135.3Power supply.146Construction requirements.146.1General.146.2Casings.156.3Indications.156.3.1General.156.3.2Electronic indicating device.166.4Inputs for volume conversion.176.5Battery powered conversion device.176.6Security devices and alarms.187Installation requirements.187.1General.187.2Temperature transducer.197.3Pressure transducer.198Performance.198.1Reference conditions.198.2Rated operating conditions.198.3Maximum permissible errors.208.3.1Error of conversion.208.3.2Specific errors for a gas-volume conversion device, type 2.208.4Influence factors.218.5Disturbances.218.6Durability.229Tests of conformity.229.1Test conditions.229.2Tests and their classification.229.3Sample of gas volume conversion device required for testing.229.4Test report.23SIST EN 12405:2004
EN 12405:2002 (E)310Marking.23Annex A (normative)
Type test.24A.1General conditions.24A.2Accuracy tests under reference conditions.26A.3Effect of ambient temperature.27A.4Effect of damp heat, steady state test.27A.5Effect of damp heat, cyclic test.28A.6Electrical power variation.29A.7Short time power interruption.29A.8Electrical bursts.30A.9Electromagnetic immunity.31A.10Electrostatic discharges.32A.11Effect of an overload of pressure.33A.12Mechanical resistance to overload of pressure.33A.13Effect of vibrations.34A.14Effect of shocks.35A.15Durability.35Annex B (informative)
Model type test report.37B.1General.37B.2Accuracy tests under reference conditions.38B.3Ambient temperature.39B.4Effect of damp heat, steady state test.42B.5Effect of damp heat, cyclic test.43B.6Electrical power variation.45B.7Short time power interruption.48B.8Electrical bursts.48B.9Electromagnetic immunity.49B.10Electrostatic discharges.50B.11Effect of an overload of static pressure.50B.12Mechanical resistance to overload of static pressure.51B.13Effect of vibrations.52B.14Effect of shocks.52B.15Durability.53Bibliography.56SIST EN 12405:2004
EN 12405:2002 (E)4ForewordThis document EN 12405:2002 has been prepared by Technical Committee CEN/TC 237 "Gas meters", thesecretariat of which 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 January 2003, and conflicting national standards shall be withdrawn at the latestby January 2003.In the preparation of this European Standard, the content of OIML Publication, “International Document 11”,“International Recommendations 6” and “International Recommendations 32” and the content of member bodies'national standards on gas-volume electronic conversion devices 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).Annex A is normative and annex B is informative.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.SIST EN 12405:2004
EN 12405:2002 (E)51 ScopeThis European Standard specifies the requirements and tests for the construction, performance, safety andconformity of gas-volume electronic conversion devices associated to gas meters, used to measure volumes of fuelgases of the 1st and 2nd families according to EN 437.Only three kinds of conversion are treated in this standard:¾ conversion as a function of temperature only (called T conversion);¾ conversion as a function of the pressure and of the temperature with constant compressibility factor (called PTconversion);¾ conversion as a function of the pressure, the temperature and taking into account the compressibility factor(called PTZ conversion).These gas-volume conversion devices consist of a calculator and a temperature transducer or a calculator, atemperature transducer and a pressure transducer locally installed.Any conversion device can provide an error curve correction for a gas meter.NOTEWhen rendering an account to an end user the readings from the conversion device can be used in conjunction withthe readings from a gas meter conforming to EN 1359, prEN 12480, or prEN 12261, as appropriate, or to any other appropriateand relevant international or national standard for gas meters, without prejudice of national regulations.This standard is intended for type testing.2 Normative referencesThis European Standard incorporates by dated or undated reference, 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 gases - Test pressures - Appliance categories.EN 1776, Gas supply systems - Natural gas measuring stations - Functional requirements.EN 50014, Electrical apparatus for potentially explosive atmospheres - General requirements.EN 50015, Electrical apparatus for potentially explosive atmospheres - Oil immersion "o".EN 50016, Electrical apparatus for potentially explosive atmospheres - Pressurized apparatus "p".EN 50017, Electrical apparatus for potentially explosive atmospheres - Powder filling "q".EN 50018, Electrical apparatus for potentially explosive atmospheres - Flameproof enclosure "d".EN 50019, Electrical apparatus for potentially explosive atmospheres - Increased safety "e".EN 50020, Electrical apparatus for potentially explosive atmospheres - Intrinsic safety "i".EN 50039, Electrical apparatus for potentially explosive atmospheres - Intrinsically safe electrical systems.EN 55011, Industrial, scientific and medical (ISM) radio-frequency equipment - Radio disturbance characteristics -Limits and methods of measurement (CISPR 11:1997, modified).SIST EN 12405:2004
EN 12405:2002 (E)6EN 60068-2-1, Environmental testing - Part 2: tests - Tests A: Cold (IEC 60068-2-1:1990).EN 60068-2-2, Basic environmental testing procedures - Part 2: Tests - Tests B: Dry heat (IEC 60068-2-2:1974 +IEC 68-2-2A:1976).EN 60068-2-30, Environmental testing - Part 2: Tests - Test Db and guidance: Damp heat, cyclic (12 + 12 hourcycle) (IEC 60068-2-30:1980 + A1:1985).EN 60068-2-31, Basic environmental testing procedures - Part 2: Tests - Test Ec: Drop and topple, primarily forequipment-type specimens (IEC 60068-2-31:1969 + A1:1982).EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).EN 60950, Safety of information technology equipment.EN 61000-4-2, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 2:Electrostatic discharge immunity test - Basic EMC publication (IEC 61000-4-2:1995).EN 61000-4-3, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 3:Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:1995, modified).EN 61000-4-4, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 4:Electrical fast transient/burst immunity test - Basic EMV publication (IEC 61000-4-4:1995).EN 61000-4-6, Electromagnetic compatibility (EMC) - Part 4: Testing and measurement techniques - Section 6:Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-6:1996).ISO 12213-1, Natural gas - Calculation of compression factor - Part 1: Introduction and guidelines.ISO 12213-2, Natural gas - Calculation of compression factor - Part 2: Calculation using molar compositionanalysis.ISO 12213-3, Natural gas - Calculation of compression factor - Part 3: Calculation using physical properties.IEC 60068-2-3, Basic environmental testing procedures - Part 2: Tests - Test Ca: Damp heat, steady state.3 Terms, definitions and symbols3.1 Terms and definitionsFor the purpose of this European Standard, the following terms and definitions apply.3.1.1gas-volume conversion devicedevice that computes, integrates and indicates the volume increments measured by a gas meter if it were operatingat base conditions, using as inputs the volume at measurement conditions as measured by the gas meter, andother parameters such as gas temperature and gas pressureNOTEThe conversion device can also compensate for the error curve of a gas meter and associated measuringtransducers.NOTEThe deviation from the ideal gas law can be compensated by the compressibility factor.3.1.1.1conversion device type 1 (complete system)conversion device with a specific type of transducer for temperature and/or pressure. The assessment of errors ofconversion are based on the overall conversion factorSIST EN 12405:2004
EN 12405:2002 (E)73.1.1.2conversion device type 2 (separate component)conversion device with external approved transducers for temperature and/or pressure and separate calculator.The assessment of errors of conversion are based on the individual transducer and calculator errors3.1.2measurement conditionsconditions of the gas whose volume is measured at the point of measurement (e.g. the temperature and thepressure of the gas)3.1.3base conditionsfixed conditions used to express the volume of gas independently of the measurement conditionsEXAMPLEStemperature of 273,15 K and absolute pressure of 1,013 25 bar1 or temperature of 288,15 K and absolutepressure of 1,013 25 bar.3.1.4sensorelement of a measuring instrument or measuring chain that is directly affected by the measurand3.1.5measuring transducerdevice that provides an output quantity having a determined relationship to the input quantity3.1.6calculatorelectronic device that receives the output signals from the associated gas meter and transducers and processesthem3.1.7indicating devicepart of a measuring instrument that displays an indication (alphanumeric string)3.1.8displayelement or assembly of elements of the indicating device on which the results of measurement and memorizedvalues are displayed3.1.9conversion factorfactor equal to the volume at base conditions divided by the corrected volume, or if there is no gas metercorrection, equal to the volume at base conditions divided by the volume at measurement conditions3.1.10calculator conversionconversation factor provided by the gas volume conversion device when its inputs are simulated by signals inaccordance with the manufacturer’s specification of interfaces3.1.11reference conversion factorfactor equal to the volume at base conditions divided by the volume at measurement conditions (i.e. having noerror, as described in 9.1)
1
1 bar = 1 000 mbar = 105 PaSIST EN 12405:2004
EN 12405:2002 (E)83.1.12specified measuring range of transducersset of values of measurands (the pressure for the pressure transducer or temperature for the temperaturetransducer) for which the errors of the conversion device are intended to lie within the limits specified in thestandardNOTEThe upper and lower limits of the specified measuring range are called maximum value and minimum valuerespectively.EXAMPLEmaximum absolute pressure: 12 bar; minimum absolute pressure: 4 bar.3.1.13specified field of measurement of a conversion deviceset of values at measurement conditions for which the errors of the conversion device are within specified limitsNOTE 1A conversion device has a measuring range for every quantity that it processes.NOTE 2The specified field of measurement applies to the characteristic quantities of the gas that are used to determine theconversion factor.3.1.14influence quantityquantity that is not a measurand but that affects the result of the measurement (e.g. ambient temperature)3.1.15rated operating conditionsconditions of use for which specified metrological characteristics of a measuring instrument are intended to liewithin defined limitsNOTEThe rated operating conditions generally specify ranges or rated values of the measurand and of the influencequantities.3.1.16reference conditionscondition of use prescribed for testing the performance of a measuring instrument or for inter-comparison of resultsof measurements3.1.17durabilityability of an instrument to maintain its performance characteristics over a specified period of use3.1.18error of indicationindication of a measuring instrument minus the (conventional) true value of the corresponding input quantity3.1.19intrinsic errorerror of a measuring instrument, determined under reference conditions3.1.20environmental classclass referring to the ambient temperature, humidity and power supply3.1.21volumevolume without specifying whether it is a corrected volume at measurement conditions or an uncorrected volume atmeasurement conditions3.1.22corrected volumevolume at measurement conditions corrected for the error curve of the gas meterSIST EN 12405:2004
EN 12405:2002 (E)93.1.23correctionvalue added algebraically to the uncorrected result of a measurement to correct the systematic error3.1.24correction factornumerical factor by which the uncorrected result of a measurement is multiplied to correct the error curve of the gasmeter3.1.25disturbancesinfluence quantity having a value within the limits specified but outside the specified rated operating conditions ofthe measurement instrument3.1.26uncertainty of measurementparameter, associated with the result of a measurement, that characterizes the dispersion of the values that couldreasonably be attributed to the measurand3.1.27error of the calculator uniterror of the indicated volume at base conditions Vb, when the gas volume, pressure and temperature are simulatedby signals, in accordance with the manufacturer’s specification of interfaces3.1.28error of the pressure transducerdifference between the measured output signals from the pressure transducer and the nominal signal at the appliedphysical value, expressed as a percentage error of the conversion factor3.1.29error of the temperature transducerdifference between the measured output signals from the temperature transducer and the nominal signal at theapplied physical value, expressed as a percentage error of the conversion factor3.1.30error of conversiondifference between the conversion factor C displayed by a conversion device and the reference conversion factorCr, expressed as a percentage of the reference conversion factor3.2 SymbolsThe symbols used in this European Standard are listed in Table 1.SIST EN 12405:2004
EN 12405:2002 (E)10Table 1 – SymbolsSymbolsRepresented quantityUnitsVvolume : Vm or Vcm3Vmvolume at measurement conditionsm3Vccorrected volume (gas meter error)m3Vbvolume at base conditionsm3Cconversion factor-CcCalculator conversion-Crreference conversion factor (i.e. conversion factor with zero error)-Cfcorrection factor-f(Q)correction function-K or K'coefficients-pabsolute pressure at measurement conditionsbarpbabsolute pressure at base conditionsbarpggauge pressurebarprreference pressure (i.e. the pressure with no errors)barTabsolute temperature at measurement conditionsKTbabsolute temperature at base conditionsKTminminimum absolute temperatureKTmaxmaximum absolute temperatureKTrreference temperature ((i.e. the temperature with no errors)°CZcompressibility factor of the gas at measurement conditions-Zbcompressibility factor of the gas at base conditions-patmatmospheric pressurebarpmaxmaximum absolute gas pressurebarpminminimum absolute gas pressurebarQflowratem3/hQmaxmaximum flowratem3/hQminminimum flowratem3/htamambient temperature°Ctam ,maxmaximum ambient temperature°Ctam ,minminimum ambient temperature°Ctgas temperature°Ctmaxmaximum gas temperature°Ctminminimum gas temperature°CUnomnominal supply voltageVfnomnominal supply frequencyHzetotal conversion factor error%e1error on the calculation of conversion factor%e2error on the pressure measurement%e3error on the temperature measurement%ecerror on the conversion factor%SIST EN 12405:2004
EN 12405:2002 (E)114 Principle of measurement4.1 Conversion as a function of temperatureIn this case the conversion device consists of a calculator and a temperature transducer and it converts the volumeto the base temperature conditions only.The volume at base conditions is obtained from the relationship:VCV ×=bC is the conversion factor given from the relationship:TKC=K is a fixed value obtained from the relationship:ZZTppKbbb××=The pressure is not measured, but may be included as a fixed value in the processing of the conversion factor.The compressibility factor is not calculated, but may be included as a fixed value in the processing of theconversion factor.The error of a gas volume conversion device, measuring only temperature, is calculated referring to the referenceconversion factor as calculated taking into account the compressibility factor at a fixed set pressure and measuredtemperature.4.2 Conversion as a function of pressure and temperatureIn this case, the conversion device consists of a calculator, a pressure transducer and a temperature transducer.The compressibility factor may be considered as a fixed value calculated from mean measurement conditions anda determined gas composition.The volume at base conditions is obtained by the relationshi
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