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
- Status
- Withdrawn
- Publication Date
- 09-Jul-2002
- Withdrawal Date
- 17-May-2005
- Technical Committee
- CEN/TC 237 - Gas meters
- Drafting Committee
- CEN/TC 237/WG 4 - Associated conversion devices
- Current Stage
- 9960 - Withdrawal effective - Withdrawal
- Start Date
- 18-May-2005
- Completion Date
- 18-May-2005
Relations
- Effective Date
- 22-Dec-2008
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Frequently Asked Questions
EN 12405:2002 is a standard published by the European Committee for Standardization (CEN). Its full title is "Gas meters - Gas-volume electronic conversion devices". This standard covers: 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.
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.
EN 12405:2002 is classified under the following ICS (International Classification for Standards) categories: 91.140.40 - Gas supply systems. The ICS classification helps identify the subject area and facilitates finding related standards.
EN 12405:2002 has the following relationships with other standards: It is inter standard links to EN 12405-1:2005. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
EN 12405:2002 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
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
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
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
1 bar = 1 000 mbar = 105 PaSIST EN 12405:2004
supply voltage: minimum to maximum voltage specified by the manufacturer.6 Construction requirements6.1 General6.1.1 All the constituent elements of a gas-volume conversion device shall be constructed of materials havingappropriate quality to resist the various forms of degradation which may occur under normal operating conditionsas specified by the manufacturer. A gas-volume conversion device shall, in all circumstances, withstand theinfluence factors and disturbances defined in 8.4 and 8.5.6.1.2 A conversion device shall be designed in such a way that it does not degrade the accuracy of themeasurement of the gas meter with which it is associated.6.1.3 The metrological parts of a conversion device shall be capable of being fitted with protective seals. Aconversion device shall be constructed in such a way that any mechanical intervention liable to influence theaccuracy of measurement shall cause permanently visible damage to its protective seals or set an alarm.6.1.4 The conversion factor shall be recalculated at intervals between the volume pulses not exceeding 1 min fora temperature conversion device and at intervals not exceeding 30 s for the other types of gas-volume conversiondevices.However, when no volume signal has been received from the gas meter for:¾ over 1 min for a temperature conversion device; or¾ over 30 s for other types,recalculation is not required until the next volume signal is received.6.1.5Any interfaces and connections fitted within the conversion device allowing the connection ofcomplementary devices shall not corrupt the metrological behaviour of the conversion device.6.1.6The interconnections and any interfaces between the calculator and the transducers are integral parts ofthe conversion device.For a gas-volume conversion device, type 2, these connections should be protected by separate seals, to avoidbreakage of the main metrological seal in the case of replacement of a component.The manufacturer shall specify the length and characteristics of the interconnections and of any interfaces wherethese may affect the accuracy of measurement of the gas-volume conversion device.SIST EN 12405:2004
General6.3.1.1 The calculator shall be fitted with an indicating device that indicates the volume at base conditions, thevolume at measurement conditions, the corrected volume (if applicable) and the alarms’indications as defined in6.6. It shall also be possible, at the time of the control operations described in annex A, to display the values of theconversion factor and of the various quantities measured or calculated.6.3.1.2The conversion device shall indicate, at least, the volume at base conditions Vb ;Additionally, the following information may be indicated by a method described in 6.3.1.3:¾ the volume at measurement conditions Vm;¾ the conversion factor C;¾ the compressibility factor if it is calculated Z;¾ the parameter values measured by the transducers (e.g. pressure p in bar, temperature t in °C);¾ the correction factor if applicable Cf;¾ the corrected volume if applicable Vc;¾ the correction function if applicable - f(Q);¾ the alarm(s) indication(s);¾ the entered data which affect the metrological result;¾ gas properties used in Z computation;¾ the reference to the method by which the compressibility factor is calculated or the constant, if appropriate;¾ the serial number of the transducers as appropriate;¾ the upper and the lower limits of the specified measuring range of the temperature transducer in K or °C andthe gauge or absolute pressure, in bar, of the pressure transducer as appropriate;¾ the value of one volumetric pulse at measurement conditions in the form:SIST EN 12405:2004
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