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CEN

EN 12405-2:2012

(Main)

Gas meters - Conversion devices - Part 2: Energy conversion

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.

General Information

Status
Published
Publication Date
24-Jul-2012
Withdrawal Date
30-Jan-2013
ICS
91.140.40 - Gas supply systems
Technical Committee
CEN/TC 237 - Gas meters
Drafting Committee
CEN/TC 237/WG 4 - Associated conversion devices
Current Stage
Ref Project
SIST EN 12405-2:2013 - Gas meters - Conversion devices - Part 2: Energy conversion

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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
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

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

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 procedu
...

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and in locations with electromagnetic disturbances likely to be found in residential, commercial and light industrial use.
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