Gas meters - Conversion devices - Part 2: Energy conversion

This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of conversion devices used to determine the energy of fuel gases described in the Table 1, including those of the 1st and 2nd families according to EN 437.
The energy conversion device (ECD) considered in this standard consists of an energy calculator (EC) and is associated with the following devices and/or functions:
-   a volume conversion device (VCD) or a flow computer used as gas meter conversion, either conforming to EN 12405-1, or to prEN 12405-3, for high accuracy measurements;
-   a calorific value determination device (CVDD).
Requirements for type approval tests of the devices, not included in the above-mentioned standards are described in appropriate annexes specified in Table 6.
For the purpose of this European Standard, the term "volume conversion devices" (VCDs) includes flow computers (FCs).
A single calculator may undertake the volume conversion functions for different metering lines.

Gaszähler - Umwerter - Teil 2: Energieumwertung

Diese Europäische Norm legt die Anforderungen und Prüfungen für die Auslegung, die Eigenschaften, die Sicherheit und die Konformität von Umwertern zur Bestimmung der Energie der in Tabelle 1 beschriebenen Brenngase, einschließlich derer der 1. und 2. Gasfamilie nach EN 437 fest.
Der in dieser Norm betrachtete Energieumwerter (E-U) besteht aus einem Energierechner (E-R) und ist mit einer oder mehreren der nachfolgenden Einheiten und/oder Funktionen verbunden:
-   einem Volumenumwerter (V-U) oder ein Durchflussrechner, verwendet als Gasmessumwerter, entweder nach EN 12405-1:2005+A2:2010 oder prEN 12405-3 für hochgenaue Energiemessungen;
-   einer Brennwert-Bestimmungseinheit (BME).
Anforderungen für Baumusterprüfungen von Baueinheiten, die nicht in den vorgenannten Normen enthalten sind, werden in den jeweiligen in Tabelle 6 aufgeführten Anhängen beschrieben.
Für die Anwendung dieser Europäischen Norm beinhaltet der Begriff „Volumenumwerter“ (V-U) auch Flowcomputer (Durchflussrechner) (FCs).
Ein einzelner Rechner kann die Volumenumrechnungsfunktionen für verschiedene Messleitungen durchführen.

Compteurs à gaz - Dispositifs de conversion - Partie 2 : Conversion en énergie

La Partie 2 de la présente norme spécifie les exigences et les essais pour la fabrication, les performances, la sécurité et la conformité des dispositifs de conversion utilisés pour déterminer l’énergie des gaz combustibles, y compris ceux de première et deuxième famille, telles que définies dans l’EN 437.
Le dispositif de conversion d’énergie (ECD) considéré dans la présente norme consiste en un calculateur d’énergie (EC) et est associé à un ou plusieurs des dispositifs et/ou fonctions suivants :
-   un dispositif de conversion de volume (VCD) ou un calculateur de débit utilisé comme dispositif de conversion de compteur de gaz, conformément à l’EN 12405-1 ou au prEN 12405-3 pour un mesurage précis de l’énergie ;
-   un dispositif de détermination du pouvoir calorifique (CVDD).
Les exigences pour les essais d’homologation du type des dispositifs non comprises dans les normes mentionnées ci-dessus sont décrites dans les annexes appropriées, spécifiées dans le Tableau 6.
Pour les besoins de la présente norme, le terme « dispositifs de conversion de volume » (VCD) comprend les calculateurs de débit (FC).
Un calculateur unique peut réaliser la fonction de conversion de volume pour plusieurs lignes de mesure.

Plinomeri - Korektorji - 2. del: Energijska korekcija

Ta evropski standard določa zahteve in preskuse za konstrukcijo, delovanje, varnost in skladnost korektorjev, ki se uporabljajo za določanje energije gorivnih plinov iz preglednice 1, vključno s korektorji iz prve in druge skupine v skladu s standardom EN 437. Energijski korektor (ECD) iz tega standarda zajema energijski kalkulator (EC) in je povezan z naslednjimi napravami in/ali funkcijami: – prostorninskim korektorjem (VCD) ali računalnikom pretoka, ki se uporablja kot korektor plinomera, in sicer v skladu s standardom EN 12405-1:2005+A2:2010 ali standardom prEN 12405-3 za zelo točne meritve, – napravo za ugotavljanje kalorične vrednosti (CVDD). Zahteve glede homologacijskih preskusov naprav, ki niso vključene v zgoraj navedene standarde, so opisane v ustreznih dodatkih, opredeljenih v preglednici 6. Izraz »prostorninski korektorji« (VCD) za namen tega evropskega standarda zajema računalnike pretoka (FC). En sam računalnik lahko izvaja funkcije prostorninske korekcije za različne merilne vode.

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Plinomeri - Korektorji - 2. del: Energijska korekcijaGaszähler - Umwerter - Teil 2: EnergieumwertungCompteurs à gaz - Dispositifs de conversion - Partie 2 : Conversion en énergieGas meters - Conversion devices - Part 2: Energy conversion91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12405-2:2012SIST EN 12405-2:2013en,fr,de01-januar-2013SIST EN 12405-2:2013SLOVENSKI

STANDARD
SIST EN 12405-2:2013
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12405-2
July 2012 ICS 91.140.40 English Version
Gas meters - Conversion devices - Part 2: Energy conversion
Compteurs à gaz - Dispositifs de conversion - Partie 2 : Conversion en énergie

Gaszähler - Umwerter - Teil 2: Energieumwertung This European Standard was approved by CEN on 9 June 2012.

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 CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.

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

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12405-2:2012: ESIST EN 12405-2:2013

EN 12405-2:2012 (E) 2

Contents Page Foreword ..............................................................................................................................................................4Introduction .........................................................................................................................................................51Scope ......................................................................................................................................................82Normative references ............................................................................................................................83Terms, definitions and symbols ........................................................................................................ 103.1Terms and definitions ........................................................................................................................ 103.2Symbols and subscripts .................................................................................................................... 143.3Classification ....................................................................................................................................... 154Principles of energy determination................................................................................................... 165Rated operating conditions ............................................................................................................... 185.1General ................................................................................................................................................. 185.2Specified field of measurement ......................................................................................................... 185.3Environmental conditions .................................................................................................................. 185.4Power supply ....................................................................................................................................... 196Construction requirements ................................................................................................................ 196.1General ................................................................................................................................................. 196.2General (including software) ............................................................................................................. 196.3Casings (and sealing) ......................................................................................................................... 216.4Indications ........................................................................................................................................... 216.5Inputs and outputs for energy determination .................................................................................. 236.6Battery powered ECD ......................................................................................................................... 246.7Security devices and alarms ............................................................................................................. 246.8Specific provisions applicable to gas chromatographs ................................................................. 257Installation requirements ................................................................................................................... 267.1General ................................................................................................................................................. 267.2CVDD .................................................................................................................................................... 268Metrological requirements ................................................................................................................. 278.1Reference conditions ......................................................................................................................... 278.2Rated operating conditions ............................................................................................................... 278.3MPEs .................................................................................................................................................... 278.4Conditions for matching associated measurement instruments (modular approach) ............... 298.5Influence factor tests .......................................................................................................................... 298.6Disturbance tests ................................................................................................................................ 298.7Verification of data transmission interfaces .................................................................................... 308.8CVDD metrological requirements ..................................................................................................... 309Tests of conformity............................................................................................................................. 309.1General ................................................................................................................................................. 309.2Verification of construction requirements ....................................................................................... 319.3Verification of performance requirements ....................................................................................... 3210Marking ................................................................................................................................................ 3310.1General ................................................................................................................................................. 3310.2Marking of energy calculator (or ECD) ............................................................................................. 3310.3Marking of CVDD................................................................................................................................. 3411Installation and operating instructions ............................................................................................ 35Annex A (normative)

Type test of the energy calculator (EC) ..................................................................... 36SIST EN 12405-2:2013

EN 12405-2:2012 (E) 3

A.1General conditions .............................................................................................................................. 36A.2EC Performance tests ......................................................................................................................... 37Annex B (normative)

Type test of the calorific value determination device (CVDD) ................................. 40B.1Scope .................................................................................................................................................... 40B.2Performances tests ............................................................................................................................. 40Annex C (normative)

Type approval tests of volume conversion device (VCD) ....................................... 48C.1Scope .................................................................................................................................................... 48C.2General ................................................................................................................................................. 48C.3Verification of data transmission interface ....................................................................................... 48Annex D (normative)

Compatibility test for the set of VCD + CVDD + EC .................................................. 49D.1Objective............................................................................................................................................... 49D.2Procedure ............................................................................................................................................. 49D.3Acceptance criteria ............................................................................................................................. 49Annex E (normative)

Type approval

test of the VCD/EC ............................................................................. 50E.1General ................................................................................................................................................. 50E.2Test

procedures .................................................................................................................................. 50E.3Performance tests ............................................................................................................................... 51Annex F (normative)

Type approval test of the EC/CVDD ........................................................................... 53F.1General ................................................................................................................................................. 53F.2Performance tests ............................................................................................................................... 53Annex G (normative)

Type approval test of the VCD/EC/CVDD ................................................................... 58G.1General ................................................................................................................................................. 58G.2Performance tests ............................................................................................................................... 58Annex H (normative)

Environmental influences (test procedures) ............................................................. 63H.1General ................................................................................................................................................. 63H.2Effect of ambient temperature............................................................................................................ 63H.3Effect of damp heat, steady state ...................................................................................................... 63H.4Cyclic damp heat ................................................................................................................................. 64H.5Electrical power variation ................................................................................................................... 65H.6Short time AC power reductions ....................................................................................................... 66H.7Electrical bursts ................................................................................................................................... 67H.8Electromagnetic susceptibility .......................................................................................................... 67H.9Electrostatic discharges ..................................................................................................................... 68H.10Short time DC power variations ......................................................................................................... 69H.11Surges on supply lines and/or signal lines ...................................................................................... 69H.12Power frequency magnetic field ........................................................................................................ 70H.13Random vibrations .............................................................................................................................. 70H.14Shocks .................................................................................................................................................. 71H.15Durability .............................................................................................................................................. 72Annex I (normative)

Testing of the data transmission interface of ECD..................................................... 73I.1General ................................................................................................................................................. 73I.2Data transmission interface tests procedure ................................................................................... 73Bibliography ...................................................................................................................................................... 74 SIST EN 12405-2:2013

EN 12405-2:2012 (E) 4

Foreword This document (EN 12405-2:2012) has been prepared by Technical Committee CEN/TC 237 “Gas meters”, the secretariat 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 or by endorsement, at the latest by January 2013, and conflicting national standards shall be withdrawn at the latest by January 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. EN 12405 consists of the following parts:  Part 1: Volume conversion (and its amendments EN12405-1/A1 and EN 12405-1+A2 to allow the harmonisation of the standard with the Measuring Instruments Directive 2004/22/EC);  Part 2: Energy conversion (this European Standard);  Part 3: Flow computers used as gas meter conversion (in preparation). In the preparation of this European Standard, the content of OIML Publication, “Recommendation 140 — measuring systems for gaseous fuel”, has been taken into account. According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 12405-2:2013

EN 12405-2:2012 (E) 5
Introduction

This introduction presents important concepts used in this standard. Energy conversion systems As an energy conversion device (ECD) comprises a number of different components and functions, for the purpose of this Standard, two different systems are considered:

System 1, where

 the calorific value determination device (CVDD) is locally installed and is considered as being fully part of the ECD, and  the energy calculator (EC) will have the ability to utilise a signal generated by this locally installed CVDD for determining energy. Figure 1 shows the various components of ECD system 1.

Figure 1
— Description of ECD system 1 SIST EN 12405-2:2013
EN 12405-2:2012 (E) 6

System 2, where  the CVDD may not be locally installed and is considered as an external transducer of the system, and  the calculator will have the ability to accept fixed or periodically updated signals for the calorific value for determining energy. Figure 2 shows the various components of ECD system 2.

Figure 2
— Description of ECD system 2
NOTE

The various components of the ECD need to be supplied as a matched, ready-for–use, set of devices; this applies to System 1 and System 2, and mechanically integrated or separated devices (see modular and global approaches below). Modular and global approaches In the modular approach, the ECD is an assembly of separate associated measuring instruments (VCD and CVDD) and an energy calculator (EC), which are verified separately. Each instrument is verified according to its testing procedure, using the indication available on the energy calculator or on the associated measuring instrument itself. In this case, the indication shall correspond to the one which is directly processed in energy conversion. The verification of calculation consists in verifying the calculation concerning each characteristic quantity of the gas and/or the calculation for the energy conversion. The associated measuring instruments are approved for a type or some types of conversion device(s) in order to ensure the compatibility of the association. If the associated measuring instruments deliver a digital signal, they may be considered as interchangeable, provided the type examination certificate provides all the necessary conditions of compatibility with the calculator of the conversion device. In the global approach, the ECD is tested as a package, performing tests of the following functions: energy calculation, volume conversion and CV determination. The testing procedures are given in Clause 9. SIST EN 12405-2:2013

EN 12405-2:2012 (E) 7

For the purpose of this standard, the following configurations of devices are accepted: Table 1

— Description of systems 1 and 2
Global approachmodular approach
System 1 VCD/CVDD/EC VCD + CVDD/EC
VCD/EC + CVDD
VCD + EC + CVDD System 2
VCD/EC (signal CV) VCD + EC (signal CV)
Key:
VCD: volume conversion device

CVDD: calorific value determination device EC: energy calculator X/Y: devices X and Y mechanically integrated, able to perform their functions separately X+Y: devices X and Y exchanging signals between them, verified separately SIST EN 12405-2:2013

EN 12405-2:2012 (E) 8

1 Scope This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of conversion devices used to determine the energy of fuel gases described in the Table 1, including those of the 1st and 2nd families according to EN 437. The energy conversion device (ECD) considered in this standard consists of an energy calculator (EC) and is associated with the following devices and/or functions:  a volume conversion device (VCD) or a flow computer used as gas meter conversion, either conforming to EN 12405-1:2005+A2:2010, or to prEN 12405-3, for high accuracy measurements;  a calorific value determination device (CVDD).

Requirements for type approval tests of the devices, not included in the above-mentioned standards are described in appropriate annexes specified in Table 6. For the purpose of this European Standard, the term “volume conversion devices” (VCDs) includes flow computers (FCs). A single calculator may undertake the volume conversion functions for different metering lines.

2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 437, Test gases - Test pressures - Appliance categories. EN 12405-1:2005+A2:2010, Gas meters — Conversion devices — Part 1: Volume conversion prEN 12405-3, Gas meters — Conversion devices — Part 3: Flow computers1)

EN 55011, Industrial, scientific and medical equipment —Radio-frequency disturbance characteristics — Limits and methods of measurement EN 60068-2-1, Environmental testing — Part 2-1: Tests — Test A: Cold EN 60068-2-2, Environmental testing — Part 2-2: Tests — Test B: Dry heat EN 60068-2-30, Environmental testing — Part 2-30: Tests — Test Db: Damp heat, cyclic (12 h + 12 h cycle) EN 60068-2-31, Environmental testing — Part 2-31: Tests — Test Ec: Rough handling shocks, primarily for equipment-type specimens EN 60068-2-47, Environmental testing — Part 2-47: Tests — Mounting of specimens for vibration, impact and similar dynamic tests EN 60068-2-64, Environmental testing — Part 2-64: Tests — Test Fh: Vibration, broadband random and guidance

1) In preparation. SIST EN 12405-2:2013
EN 12405-2:2012 (E) 9

EN 60068-2-78, Environmental testing — Part 2-78: Tests — Test Cab: Damp heat, steady state EN 60068-3-1, Environmental testing — Part 3-1: Supporting documentation and guidance — Cold and dry heat tests EN 60068-3-4, Environmental testing — Part 3-4: Supporting documentation and guidance — Damp heat tests EN 60068-3-8, Environmental testing - Part 3-8: Supporting documentation and guidance – Selecting amongst vibration tests EN 60079 (all parts), Explosive atmospheres EN 60529, Degrees of protection provided by enclosures (IP Code) EN 60654-2, Operating conditions for industrial-process measurement and control equipment — Part 2: Power EN 60730-1:2011, Automatic electrical controls for household and similar use — Part 1: General requirements EN 60950-1, Information technology equipment - Safety - Part 1: General requirements IEC 61000-2-1, Electromagnetic compatibility (EMC) Part 2: Environment Section 1: Description of the environment — electromagnetic environment for low-frequency conducted disturbances and signalling in public power supply systems EN 61000-2-2, Electromagnetic compatibility (EMC)

— Part 2-2: Environment — Compatibility levels for low-frequency conducted disturbances and signalling in public low-voltage power supply systems EN 61000-4-1, Electromagnetic compatibility (EMC) - Part 4-1: Testing and measurement techniques — Overview of IEC 61000-4 series EN 61000-4-2, Electromagnetic compatibility (EMC) — Part 4-2: Testing and measurement techniques — Electrostatic discharge immunity test EN 61000-4-3, Electromagnetic compatibility (EMC) — Part 4-3: Testing and measurement techniques — Radiated, Radio frequency, electromagnetic field immunity test EN 61000-4-4, Electromagnetic compatibility (EMC) — Part 4-4: Testing and measurement techniques — Electrical fast transient/burst immunity test EN 61000-4-5, Electromagnetic compatibility (EMC) — Part 4-5: Testing and measurement techniques — Surge immunity test EN 61000-4-6, Electromagnetic compatibility (EMC) — Part 4-6: Testing and measurement techniques — Immunity to conducted disturbances, induced by radio-frequency fields EN 61000-4-8, Electromagnetic compatibility (EMC) — Part 4-8: Testing and measurement techniques — Power frequency magnetic field immunity test EN 61000-4-11, Electromagnetic compatibility (EMC) — Part 4-11: Testing and measurement techniques — Voltage dips, short interruptions and voltage variations immunity tests EN 61000-4-29, Electromagnetic compatibility (EMC) — Part 4-29: Testing and measurement techniques — Voltage dips, short interruptions and voltage variations on d.c. input power port immunity tests EN 61000-6-1, Electromagnetic compatibility (EMC) — Part 6-1: Generic standards — Immunity for residential, commercial and light-industrial environments SIST EN 12405-2:2013

EN 12405-2:2012 (E) 10

EN 61000-6-2, Electromagnetic compatibility (EMC) — Part 6-2: Generic standards — Immunity for industrial environments EN ISO 6974-1, Determination of composition and associated uncertainty by gas chromatography — Part 1: General guidelines and calculation of composition (ISO 6974-1) EN ISO 12213-2, Natural gas — Calculation of compression factor — Part 2: Calculation using molar-composition analysis (ISO 12213-2) EN ISO 12213-3, Natural gas — Calculation of compression factor — Part 3: Calculation using physical properties (ISO 12213-3)

EN ISO 13443: 2005, Natural gas — Standard reference conditions (ISO 13443:1996 including Corrigendum 1:1997) ISO 6141, Gas analysis — Requirements for certificates for calibration gases and gas mixtures ISO 6142, Gas analysis — Preparation of calibration gas mixtures — Gravimetric method ISO 6143, Gas analysis — Comparison methods for determining and checking the composition of calibration gas mixtures ISO 6976, Natural gas — Calculation of calorific value, density, relative density and Wobbe index from composition 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 adjustment interval time interval or number of measurements between two necessary adjustments of a calorific value determining device 3.1.2 associated measuring instruments instruments for measuring certain quantities which are characteristic of the gas (temperature, pressure, calorific value etc.), whose indications are used by the calculator with a view to making a correction and/or a conversion Note 1 to entry: For the purpose of this standard, when dealing with the ECD in modular approach, the VCD and CVDD are considered as associated measuring instruments. 3.1.3 base conditions fixed conditions used to express the volume of gas independently of the metering conditions and the superior calorific value Note 1 to entry: The pressure base for both volumetric metering and combustion is always 101,325 kPa. The temperature needs to be specified EXAMPLE Temperature of 273,15 K and absolute pressure of 1,013 25 bar or temperature of 288,15 K and absolute pressure of 1,013 25 bar. SIST EN 12405-2:2013

EN 12405-2:2012 (E) 11
3.1.4 calorific value determining device

CVDD associated measuring instrument for determining the calorific value of gas 3.1.5 compression factor parameter which indicates the deviation from the ideal gas Note 1 to entry: The compression factor calculation needs to be carried out according to ISO 12213 part 2 or 3. 3.1.6 display element or assembly of elements of the indicating device on which the results of measurement and memorised values are displayed 3.1.7 disturbance influence quantity having a value within the limits specified but outside the specified rated operating conditions of the measuring instrument Note 1 to entry: An influence quantity is a disturbance if the rated operating conditions for that influence quantity are not specified. 3.1.8 energy conversion device ECD device which calculates, integrates and displays energy using volume at base conditions and the calorific value or the gas composition 3.1.9 global approach approach through which the performances of the energy conversion device (ECD) are verified and approved with a completely integrated package, including the energy calculation, the associated measuring instruments and other functions 3.1.10 influence factor influence quantity having a value within the specified rated operating conditions of the measuring instrument 3.1.11 influence quantity quantity that is not a measurand but that affects the result of the measurement EXAMPLE Ambient temperature. 3.1.12 maximum permissible error

extreme value of the measurement error, with respect to a known reference quantity value, permitted by specifications or regulations for a given measurement, measuring instrument or measuring system Note 1 to entry: Generally, the two extreme values are taken together and are termed "maximum permissible errors" or "limit of error". 3.1.13 measurand particular quantity subject to measurement SIST EN 12405-2:2013

EN 12405-2:2012 (E) 12

3.1.14 measurement repeatability repeatability measurement precision under a set of repeatable conditions of measurement 3.1.15 metering conditions conditions of the gas at which the volume is measured at the point of measurement

Note 1 to entry: Metering conditions include the temperature and pressure of the measured gas. 3.1.16 modular approach approach combining associated measuring instruments (VCD and CVDD) and an energy calcula

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