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CEN

EN 12405-3:2015

(Main)

Gas meters - Conversion devices - Part 3: Flow computer

Gas meters - Conversion devices - Part 3: Flow computer

Part 3 of this European Standard specifies the requirements and tests for the construction, performance, safety and conformity of flow computers (FCs) used to meet the metrological and technical requirements of a high accuracy volume conversion device.
They are used to determine volume of fuel gases, including those of the first and second families according to EN 437.
For the purpose of this European Standard, only flow computers that are intended to operate with ultrasonic meters according to ISO 17089 1 or gas turbine meters conforming to EN 12261 are considered.
For the purpose of this European Standard only classification classes E2 and M1 are considered for the flow computer calculator.
FCs are equipped with external separate transducers for pressure and temperature which may be approved separately.
The provisions concerning pressure and temperature transducers are given in Annex B and C.
Requirements and tests are given for energy calculator in EN 12405 2.

Gaszähler - Umwerter - Teil 3: Flowcomputer

Teil 3 dieser Europäischen Norm legt die Anforderungen und Prüfungen an den Bau, die Leistungsfähigkeit, die Sicherheit und die Konformität von Flowcomputern (FC) fest, die zur Erfüllung metrologischer und technischer Anforderungen eines Volumenumwerters mit hoher Genauigkeit verwendet werden.
Sie werden zur Bestimmung des Volumens von Brenngasen einschließlich der Brenngase der ersten und zweiten Familie nach EN 437 verwendet.
Für die Anwendung dieser Europäischen Norm werden ausschließlich Flowcomputer betrachtet, die für den Betrieb mit Ultraschallzählern nach ISO 17089 1 oder Turbinenradgaszählern nach EN 12261 vorgesehen sind.
Für die Anwendung dieser Europäischen Norm werden für Rechner von Flowcomputern ausschließlich die Klassifizierungsklassen E2 und M1 berücksichtigt.
Die Flowcomputer sind mit externen gesonderten Messumformern für Druck und Temperatur ausgestattet, die separat genehmigt werden dürfen.
Die Festlegungen hinsichtlich der Druck- und Temperatur-Messumformer sind in Anhang B und C enthalten.
Die Anforderungen und Prüfungen für den Energierechner sind in EN 12405-2 angegeben.

Compteurs de gaz - Dispositifs de conversion - Partie 3: Calculateurs de débit

La partie 3 de la présente Norme européenne définit les exigences et les essais pour la fabrication, les performances, la sécurité et la conformité des calculateurs de débit (FC) utilisés pour satisfaire aux exigences métrologiques et techniques d'un dispositif de conversion de volume de grande exactitude.
Ils sont utilisés pour déterminer le volume des gaz combustibles, y compris ceux de première et deuxième famille conformément à l'EN 437.
Pour les besoins de la présente Norme européenne, seuls les calculateurs de débit qui sont prévus pour fonctionner avec des compteurs à ultrasons conformément à l'ISO 17089-1 ou avec des compteurs de gaz à turbine conformément à l'EN 12261 sont pris en compte.
Pour les besoins de la présente Norme européenne, seules les classes E2 et M1 sont prises en compte pour le calculateur de débit.
Les FC doivent être équipés de transducteurs externes distincts pour la pression et la température, qui peuvent être homologués séparément.
Les dispositions relatives aux transducteurs de pression et de température sont données aux Annexes B et C.
Pour les calculateurs d'énergie, les exigences et les essais sont donnés dans l'EN 12405-2.

Plinomeri - Korektorji - 3. del: Računalnik pretoka

Del 3 tega standarda določa zahteve in preskuse za izgradnjo, delovanje, varnost in skladnost računalnikov pretoka, ki se uporabljajo za izpolnjevanje meroslovnih in tehničnih zahtev visokonatančne naprave za prostorninsko konverzijo.

General Information

Status
Published
Publication Date
01-Dec-2015
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
9093 - Decision to confirm - Review Enquiry
Completion Date
10-Jun-2021
Ref Project
SIST EN 12405-3:2016 - Gas meters - Conversion devices - Part 3: Flow computer

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Gaszähler - Umwerter - Teil 3: Ergänzendes ElementCompteurs de gaz - Dispositifs de conversion - Partie 3 : Calculateurs de débitGas meters - Conversion devices - Part 3: Flow computer91.140.40Sistemi za oskrbo s plinomGas supply systemsICS:Ta slovenski standard je istoveten z:EN 12405-3:2015SIST EN 12405-3:2016en,fr,de01-februar-2016SIST EN 12405-3:2016SLOVENSKI
STANDARD



SIST EN 12405-3:2016



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12405-3
December
t r s w ICS
{ sä s v rä v r English Version
Gas meters æ Conversion devices æ Part
uã Flow computer Compteurs de gaz æ Dispositifs de conversion æ Partie
uã Calculateurs de débit
Gaszähler æ Umwerter æ Teil
uã Flowcomputer This European Standard was approved by CEN on
s { September
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s t v r wæ uã t r s w ESIST EN 12405-3:2016



EN 12405-3:2015 (E) 2 Contents Page European foreword . 5 Introduction . 6 1 Scope . 8 2 Normative references . 8 3 Terms, definitions and symbols . 10 3.1 Terms and definitions . 10 3.2 Symbols and subscripts . 16 3.3 Abbreviations . 18 3.4 Environmental classification for flow computers . 18 3.4.1 Climatic conditions . 18 3.4.2 Mechanical conditions . 18 3.4.3 Electrical and Electromagnetic conditions . 18 4 Principle of measurement . 18 4.1 General . 18 4.2 Correction functions . 19 4.2.1 General . 19 4.2.2 Correction of the volume at measurement conditions . 20 4.2.3 Temperature and pressure correction of USM body dimension . 23 4.2.4 Temperature and pressure measurement correction for con
...

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