Gas meters - Conversion devices - Part 1: Volume conversion

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.
This European Standard is intended for type testing, the detailed relevant provisions of which are given in Annex A.
Only three kinds of conversion are treated in this European Standard:
-   conversion as a function of temperature only (called T conversion);
-   conversion as a function of the pressure and of the temperature with constant compression factor (called PT conversion);
-   conversion as a function of the pressure, the temperature and taking into account the compression factor (called PTZ conversion).
EN 12405-2 for energy conversion is in preparation.
Gas-volume conversion devices consist of a calculator and a temperature transducer or a calculator, a temperature transducer and a pressure transducer locally installed.
For application of this European Standard, a conversion device may be, as a choice of the manufacturer, considered as a complete instrument (Type 1) or made of separate elements (Type 2), according to the definitions given in 3.1.18.1 and 3.1.18.2.
In this last case, the provisions concerning pressure transducers, temperature sensors and temperature transducers are given in Annexes B, C and D respectively.
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, EN 12480, or EN 12261, as appropriate, or to any other appropriate and relevant international or national standard for gas meters, without prejudice of national regulations.

Gaszähler - Umwerter - Teil 1: Volumenumwertung

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.
Diese Europäische Norm ist für die Bauartprüfung vorgesehen, deren relevante Bestimmungen im Einzelnen in Anhang A angegeben sind.
In dieser Europäischen Norm werden nur drei Arten der Umwertung behandelt:
-   die Umwertung als reine Temperaturfunktion (T-Umwertung);
-   die Umwertung als Funktion von Druck und Temperatur mit einem konstanten Realgasfaktor (PT-Umwertung);
-   die Umwertung als Funktion von Druck, Temperatur und Realgasfaktor (PTZ-Umwertung).
EN 12405-2 zu Energieumwertung ist in Vorbereitung.
Zustands-Mengenumwerter bestehen aus einem Rechner und einem Temperaturmessumformer oder aus einem Rechner, einem Temperaturmessumformer und einem Druckmessumformer, die in der Messanlage installiert sind.
Für die Anwendung dieser Europäischen Norm kann ein Umwerter in Übereinstimmung mit den Definitionen 3.1.18.1 und 3.1.18.2 und je nach Hersteller ein Kompaktzustands-Mengenumwerter (vollständiges Gerät, Typ 1) sein oder aus getrennten Elementen bestehen (Typ 2).
Im letztgenannten Fall sind die Bestimmungen zu Druckmessumformern, Temperaturmessfühlern und Temperaturmessumformern in den Anhängen B, C bzw. D enthalten.
Alle Umwerter können auch Einrichtungen zur Korrektur der Fehlerkurve des Gaszählers enthalten.
ANMERKUNG   Unbeschadet nationaler Regelungen können die Zählerstandsablesungen vom Umwerter in Verbindung mit den Zählerstandsablesungen von Gaszählern, die EN 1359, EN 12480 bzw. EN 12261 oder anderen zutreffenden und relevanten internationalen oder nationalen Normen für Gaszähler entsprechen, für die Rechnungsstellung an Endverbraucher genutzt werden.

Compteurs de gaz - Dispositifs de conversion - Partie 1: Conversion de volume

La présente Norme européenne définit des exigences et des essais pour la fabrication, les performances, la sécurité et la conformité des dispositifs électroniques de conversion de volume de gaz, associés à des compteurs de gaz et utilisés pour mesurer des volumes de gaz combustibles de première et deuxième famille, telles que définies dans l'EN 437.
Cette Norme européenne est destinée aux essais de type, pour lesquels les détails sont fournis à l'Annexe A.
Cette Norme européenne 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 avec prise en compte du facteur de compressibilité (appelée " conversion PTZ ").
l'EN 12405-2 relative à la conversion d'énergie est en préparation.
Les dispositifs de conversion de volume de gaz sont constitués d'un calculateur et d'un transducteur de température, ou bien d'un calculateur, d'un transducteur de température et d'un transducteur de pression installé localement.
Pour l'application de la présente Norme européenne, le fabricant a le choix de considérer un dispositif de conversion en tant qu'instrument complet (Type 1) ou en tant qu'assemblage d'éléments séparés (Type 2), conformément aux définitions données en 3.1.18.1 et 3.1.18.2.
Dans le dernier cas, les données concernant les transducteurs de pression, les capteurs de température et les transducteurs de température sont respectivement fournies aux Annexes B, C et D.
Tout dispositif de conversion peut comporter une correction de la courbe d'erreur du compteur de gaz.

Plinomeri – Korektorji – 1. del: Volumska konverzija

General Information

Status
Withdrawn
Publication Date
17-May-2005
Withdrawal Date
26-Oct-2010
Current Stage
9960 - Withdrawal effective - Withdrawal
Due Date
27-Oct-2010
Completion Date
27-Oct-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gas meters - Conversion devices - Part 1: Volume conversionPlinomeri – Korektorji – 1. del: Volumska konverzijaCompteurs de gaz - Dispositifs de conversion - Partie 1: Conversion de volumeGaszähler - Umwerter - Teil 1: VolumenumwertungTa slovenski standard je istoveten z:EN 12405-1:2005SIST EN 12405-1:2005en,fr,de91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:SIST EN 12405:20041DGRPHãþDSLOVENSKI

STANDARDSIST EN 12405-1:200501-december-2005
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12405-1
May 2005 ICS 91.140.40 Supersedes EN 12405:2002 English version
Gas meters - Conversion devices - Part 1: Volume conversion
Compteurs de gaz - Dispositifs de conversion - Partie 1: Conversion de volume

Gaszähler - Umwerter - Teil 1: Volumenumwertung This European Standard was approved by CEN on 15 March 2005.

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.

This 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 Central Secretariat has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36

B-1050 Brussels © 2005 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12405-1:2005: E

EN 12405-1:2005 (E) 2 Contents Page Foreword......................................................................................................................................................................8 1 Scope..............................................................................................................................................................9 2 Normative references....................................................................................................................................9 3 Terms, definitions and symbols.................................................................................................................11 3.1 Terms and definitions.................................................................................................................................11 3.2 Symbols........................................................................................................................................................14 4 Principle of measurement...........................................................................................................................16 4.1 Conversion as a function of temperature.................................................................................................16 4.2 Conversion as a function of pressure and temperature..........................................................................16 4.3 Conversion as a function of pressure, temperature and deviation from the ideal gas law.................17 4.4 Correction of the volume at measurement conditions............................................................................17 5 Rated operating conditions........................................................................................................................18 5.1 Specified field of measurement..................................................................................................................18 5.1.1 Specified measurement range for gas pressure......................................................................................18 5.1.2 Specified measurement range for gas temperature.................................................................................18 5.1.3 Gas characteristics......................................................................................................................................18 5.2 Environmental class....................................................................................................................................18 5.2.1 Ambient temperature range........................................................................................................................18 5.2.2 Humidity range.............................................................................................................................................19 5.3 Power supply................................................................................................................................................19 6 Construction requirements.........................................................................................................................19 6.1 General..........................................................................................................................................................19 6.2 Casings.........................................................................................................................................................20 6.3 Indications....................................................................................................................................................20 6.3.1 General..........................................................................................................................................................20 6.3.2 Electronic indicating device.......................................................................................................................22 6.4 Inputs for volume conversion....................................................................................................................22 6.5 Battery powered conversion device..........................................................................................................22 6.6 Security devices and alarms......................................................................................................................23 7 Installation requirements............................................................................................................................24 7.1 General..........................................................................................................................................................24 7.2 Temperature transducer.............................................................................................................................24 7.3 Pressure transducer....................................................................................................................................24 8 Performance.................................................................................................................................................24 8.1 Reference conditions..................................................................................................................................24 8.2 Rated operating conditions........................................................................................................................25 8.3 Maximum permissible errors......................................................................................................................25 8.3.1 General..........................................................................................................................................................25 8.3.2 Error of conversion......................................................................................................................................26 8.3.3 Specific errors for a gas-volume conversion device, type 2...................................................................26 8.4 Conditions of matching the constituent elements of a conversion device type 2...............................26 8.5 Influence factors..........................................................................................................................................27 8.6 Disturbances................................................................................................................................................27 8.7 Durability......................................................................................................................................................27 9 Tests of conformity......................................................................................................................................27 9.1 Verification of the construction requirements..........................................................................................27 9.2 Verification of the performance requirements..........................................................................................27

EN 12405-1:2005 (E) 3 9.2.1 Test conditions............................................................................................................................................27 9.2.3 Samples of gas volume conversion device type 1 required for testing................................................28 9.2.4 Samples of gas volume conversion devices type 2 required for testing..............................................30 9.3 Test report....................................................................................................................................................30 10 Marking.........................................................................................................................................................30 Annex A (normative)

Type test..............................................................................................................................32 A.1 General conditions......................................................................................................................................32 A.1.1 General..........................................................................................................................................................32 A.1.2 Additional conditions specific to gas volume conversion devices type 1............................................32 A.1.3 Additional conditions specific to gas-volume conversion devices type 2............................................32 A.1.4 Test procedures...........................................................................................................................................33 A.1.5 Verification of the construction requirements.........................................................................................34 A.2 Accuracy tests under reference conditions..............................................................................................34 A.2.1 Objective.......................................................................................................................................................34 A.2.2 Reference to documents.............................................................................................................................35 A.2.3 Procedure.....................................................................................................................................................35 A.2.4 Acceptance criteria......................................................................................................................................35 A.3 Effect of ambient temperature....................................................................................................................35 A.3.1 Objective.......................................................................................................................................................35 A.3.2 Reference to documents.............................................................................................................................35 A.3.3 Procedure.....................................................................................................................................................35 A.3.4 Acceptance criteria......................................................................................................................................35 A.4 Effect of damp heat, steady state test.......................................................................................................35 A.4.1 Objective.......................................................................................................................................................35 A.4.2 Reference to documents.............................................................................................................................35 A.4.3 Procedure.....................................................................................................................................................36 A.4.4 Acceptance criteria......................................................................................................................................36 A.5 Effect of damp heat, cyclic test..................................................................................................................36 A.5.1 Objective.......................................................................................................................................................36 A.5.2 Reference to documents.............................................................................................................................36 A.5.3 Procedure.....................................................................................................................................................36 A.5.4 Acceptance criteria......................................................................................................................................37 A.6 Electrical power variation...........................................................................................................................37 A.6.1 Objective.......................................................................................................................................................37 A.6.2 Reference to documents.............................................................................................................................37 A.6.3 Procedure.....................................................................................................................................................37 A.6.4 Acceptance criteria......................................................................................................................................37 A.7 Short time power reductions......................................................................................................................38 A.7.1 Objective.......................................................................................................................................................38 A.7.2 Reference to documents.............................................................................................................................38 A.7.3 Procedure.....................................................................................................................................................38 A.7.4 Acceptance criteria......................................................................................................................................38 A.8 Electrical bursts...........................................................................................................................................38 A.8.1 Objective.......................................................................................................................................................38 A.8.2 Reference to documents.............................................................................................................................38 A.8.3 Procedure.....................................................................................................................................................38 A.8.4 Acceptance criteria......................................................................................................................................38 A.9 Electromagnetic susceptibility...................................................................................................................39 A.9.1 Objective.......................................................................................................................................................39 A.9.2 Reference to dcouments.............................................................................................................................39 A.9.3 Procedure.....................................................................................................................................................39 A.9.4 Acceptance criteria......................................................................................................................................39 A.10 Electrostatic discharges.............................................................................................................................39 A.10.1 Objective.......................................................................................................................................................39 A.10.2 Reference to documents.............................................................................................................................39 A.10.3 Procedure.....................................................................................................................................................39 A.10.4 Acceptance criteria......................................................................................................................................40 A.11 Overload of pressure (only for type 1 and pressure transducers).........................................................40 A.11.1 Objective.......................................................................................................................................................40 A.11.2 Reference to documents.............................................................................................................................40

EN 12405-1:2005 (E) 4 A.11.3 Procedure.....................................................................................................................................................40 A.11.4 Acceptance criteria......................................................................................................................................40 A.12 Effect of vibrations......................................................................................................................................40 A.12.1 Objective.......................................................................................................................................................40 A.12.2 Reference to documents.............................................................................................................................40 A.12.3 Procedure.....................................................................................................................................................41 A.12.4 Acceptance criteria......................................................................................................................................41 A.13 Effect of shocks...........................................................................................................................................41 A.13.1 Objective.......................................................................................................................................................41 A.13.2 Reference to documents.............................................................................................................................41 A.13.3 Procedure.....................................................................................................................................................41 A.13.4 Acceptance criteria......................................................................................................................................41 A.14 Overload of pressure (mechanical)............................................................................................................41 A.14.1 Objective.......................................................................................................................................................41 A.14.2 Reference to documents.............................................................................................................................42 A.14.3 Procedure.....................................................................................................................................................42 A.14.4 Acceptance criteria......................................................................................................................................42 A.15 Durability......................................................................................................................................................42 A.15.1 Objective.......................................................................................................................................................42 A.15.2 Reference to documents.............................................................................................................................42 A.15.3 Procedure.....................................................................................................................................................42 A.15.4 Acceptance criteria......................................................................................................................................43 A.16 Alarms operation.........................................................................................................................................43 A.16.1 Objective.......................................................................................................................................................43 A.16.2 Reference to documents.............................................................................................................................43 A.16.3 Procedure.....................................................................................................................................................43 A.16.4 Acceptance criteria......................................................................................................................................43 Annex B (normative)

Pressure transducers........................................................................................................44 B.1 Scope............................................................................................................................................................44 B.2 Rated operating conditions........................................................................................................................44 B.2.1 Specified measurement range for pressure.............................................................................................44 B.2.2 Environmental class....................................................................................................................................44 B.2.3 Power supply................................................................................................................................................44 B.3 Construction requirements.........................................................................................................................44 B.3.1 General..........................................................................................................................................................44 B.3.2 Casings.........................................................................................................................................................44 B.3.3 Indications....................................................................................................................................................44 B.4 Performances...............................................................................................................................................45 B.4.1 Reference conditions..................................................................................................................................45 B.4.2 Rated operating conditions........................................................................................................................45 B.4.3 Maximum permissible errors......................................................................................................................45 B.4.4 Influence factors..........................................................................................................................................45 B.4.5 Disturbances................................................................................................................................................45 B.4.6 Durability......................................................................................................................................................45 B.5 Tests of conformity......................................................................................................................................46 B.5.1 Test conditions............................................................................................................................................46 B.5.2 Tests..............................................................................................................................................................46 B.5.3 Sample of pressure transducers required for testing..............................................................................46 B.6 Marking.........................................................................................................................................................46 Annex C (normative)

Platinum resistance thermometer sensors.....................................................................47 C.1 Scope............................................................................................................................................................47 C.2 Operating rated conditions.........................................................................................................................47 C.2.1 Specified measurement range for temperature........................................................................................47 C.2.2 Environmental class....................................................................................................................................47 C.3 Construction requirements.........................................................................................................................47 C.4 Performances...............................................................................................................................................47 C.5 Marking.........................................................................................................................................................48 C.5.1 Required markings......................................................................................................................................48 C.5.2 Verification mark..........................................................................................................................................48 C.6 Metrological verifications...........................................................................................................................48

EN 12405-1:2005 (E) 5 C.6.1 Type approval..............................................................................................................................................48 C.6.2 Initial verification.........................................................................................................................................49 C.7 Verification procedure.................................................................................................................................49 C.7.1 Visual inspection.........................................................................................................................................49 C.7.2 Type testing (type approval).......................................................................................................................49 C.7.3 Samples of PRT required for testing.........................................................................................................49 C.7.4 Initial verification.........................................................................................................................................49 Annex D (normative)

Temperature transducers..................................................................................................51 D.1 Scope......................

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