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EN ISO 20456:2019

(Main)

Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids (ISO 20456:2017)

Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids (ISO 20456:2017)

ISO 20456:2017 applies to industrial electromagnetic flowmeters used for the measurement of flowrate of a conductive liquid in a closed conduit running full. It covers flowmeter types utilizing both alternating current (AC) and pulsed direct current (DC) circuits to drive the field coils and meters running from a mains power supply and those operating from batteries or other sources of power.
ISO 20456:2017 is not applicable to insertion-type flowmeters or electromagnetic flowmeters designed to work in open channels or pipes running partially full, nor does it apply to the measurement of magnetically permeable slurries or liquid metal applications.
ISO 20456:2017 does not specify safety requirements in relation to hazardous environmental usage of the flowmeter.

Messung des Durchflusses in geschlossenen Leitungen - Richtlinie für den Einsatz von elektromagnetischen Durchflussmessgeräten für konduktive Fluide (ISO 20456:2017)

Dieses Dokument gilt für industrielle elektromagnetische Durchflussmessgeräte, die zur Messung des Durch¬flusses einer leitfähigen Flüssigkeit in einer geschlossenen, volldurchströmten Leitung eingesetzt werden. Es erfasst Durchflussmessgerätearten, die sowohl Wechselstrom  (AC) als auch gepulste Gleichstromkreise (DC) verwenden, um die Feldspulen anzusteuern, und Messgeräte, die über ein Netz betrieben werden, und solche, die mit Batterien oder anderen Energiequellen betrieben werden.
Dieses Dokument gilt nicht für Einsteck Durchflussmessgeräte oder elektromagnetische Durchflussmess¬geräte, die für das Arbeiten in offenen Gerinnen oder Rohren ausgelegt sind, die teilweise durchströmt sind, und auch nicht für die Messung von magnetisch permeablen Schlämmen oder Flüssigmetallanwendungen.
Dieses Dokument legt keine Sicherheitsanforderungen in Bezug auf den Einsatz des Durchflussmessgerätes in gefährlichen Umgebungen fest.

Mesurage du débit des fluides dans les conduites fermées - Lignes directrices pour l'utilisation des débitmètres électromagnétiques dans les liquides conducteurs (ISO 20456:2017)

Le présent document s'applique aux débitmètres électromagnétiques industriels utilisés pour mesurer le débit d'un liquide conducteur dans une conduite fermée remplie. Il traite des types de débitmètres utilisant à la fois des circuits à courant alternatif (CA) et à courant continu (CC) pulsé pour entraîner les bobines de champs et les débitmètres branchés sur secteur ainsi que ceux fonctionnant sur batteries ou d'autres sources d'énergie.
Le présent document n'est pas applicable aux débitmètres à insertion ou aux débitmètres électromagnétiques conçus pour fonctionner dans des canalisations ou des conduites ouvertes partiellement remplies, ni au mesurage de pâtes magnétiquement perméables ou aux applications de métal liquide.
Le présent document ne spécifie aucune exigence de sécurité applicable à l'utilisation environnementale dangereuse du débitmètre.

Merjenje pretoka fluida v zaprtih vodih - Navodilo za uporabo elektromagnetnih pretočnih meril za prevodne tekočine (ISO 20456:2017)

Standard ISO 20456:2017 se uporablja za industrijska elektromagnetna pretočna merila, ki se uporabljajo za merjenje pretoka prevodne tekočine v polno zapolnjenem zaprtem cevovodu. Obravnava vrste pretočnih meril, ki uporabljajo izmenični (AC) in pulzirajoči enosmerni (DC) tokokrog za poganjanje vzbujalne tuljave in merilnikov, ki se napajajo iz omrežnega napajanja, in tistih, ki delujejo na baterije ali druge vire napajanja. Standard ISO 20456:2017 se ne uporablja za vstavljiva pretočna merila ali elektromagnetna pretočna merila, zasnovana za delovanje v odprtih delno zapolnjenih kanalih ali ceveh, prav tako se ne uporablja za merjenje magnetno prepustnih brozg ali tekočih kovin. Standard ISO 20456:2017 ne določa varnostnih zahtev v zvezi z okolju nevarno uporabo pretočnega merila.

General Information

Status
Published
Publication Date
15-Oct-2019
Withdrawal Date
29-Apr-2020
ICS
17.120.10 - Flow in closed conduits
Technical Committee
CEN/SS F05 - Measuring insreuments
Drafting Committee
CEN/SS F05 - Measuring insreuments
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Start Date
16-Oct-2019
Completion Date
16-Oct-2019
Ref Project
SIST EN ISO 20456:2019 - Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic flowmeters for conductive liquids (ISO 20456:2017)

Relations

Replaces
EN ISO 6817:1995 - Measurement of conductive liquid flow in closed conduits - Methods using electromagnetic flow-meters (ISO 6817:1992)
Effective Date
23-Oct-2019
Replaces
EN 29104:1993 - Measurement of fluid flow in closed conduits - Methods of evaluating the performance of electromagnetic flow-meters for liquids (ISO 9104:1991)
Effective Date
23-Oct-2019

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SLOVENSKI STANDARD
01-december-2019
Nadomešča:
SIST EN 29104:2001
SIST EN ISO 6817:1997
Merjenje pretoka fluida v zaprtih vodih - Navodilo za uporabo elektromagnetnih
pretočnih meril za prevodne tekočine (ISO 20456:2017)
Measurement of fluid flow in closed conduits - Guidance for the use of electromagnetic
flowmeters for conductive liquids (ISO 20456:2017)
Messung des Durchflusses in geschlossenen Leitungen - Richtlinie für den Einsatz von
elektromagnetischen Durchflussmessgeräten für konduktive Fluide (ISO 20456:2017)
Mesurage du débit des fluides dans les conduites fermées - Lignes directrices pour
l'utilisation des débitmètres électromagnétiques dans les liquides conducteurs (ISO
20456:2017)
Ta slovenski standard je istoveten z: EN ISO 20456:2019
ICS:
17.120.10 Pretok v zaprtih vodih Flow in closed conduits
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20456
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 17.120.10 Supersedes EN 29104:1993, EN ISO 6817:1995
English Version
Measurement of fluid flow in closed conduits - Guidance
for the use of electromagnetic flowmeters for conductive
liquids (ISO 20456:2017)
Mesurage du débit des fluides dans les conduites Messung des Durchflusses in geschlossenen Leitungen
fermées - Lignes directrices pour l'utilisation des - Richtlinie für den Einsatz von elektromagnetischen
débitmètres électromagnétiques dans les liquides Durchflussmessgeräten für konduktive Fluide (ISO
conducteurs (ISO 20456:2017) 20456:2017)
This European Standard was approved by CEN on 26 August 2019.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20456:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 20456:2017 has been prepared by Technical Committee ISO/TC 30 "Measurement of
fluid flow in closed conduits” of the International Organization for Standardization (ISO) and has been
taken over as EN ISO 20456:2019 by CCMC.
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 April 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 29104:1993 and EN ISO 6817:1995.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 20456:2017 has been approved by CEN as EN ISO 20456:2019 without any modification.

INTERNATIONAL ISO
STANDARD 20456
First edition
2017-09
Measurement of fluid flow in closed
conduits — Guidance for the use
of electromagnetic flowmeters for
conductive liquids
Mesurage du débit des fluides dans les conduites fermées — Lignes
directrices pour l'utilisation des débitmètres électromagnétiques dans
les liquides conducteurs
Reference number
ISO 20456:2017(E)
©
ISO 2017
ISO 20456:2017(E)
© ISO 2017, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved

ISO 20456:2017(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 3
5 Theory and basic formulae . 4
6 Construction and principle of operation . 4
6.1 General . 4
6.2 Sensor . 5
6.3 Transmitter . 7
6.3.1 General. 7
6.3.2 Alternating magnetic field in the measuring system . 7
6.3.3 Measuring system with applied pulsed DC excitation (simplified model) . 7
6.3.4 Measuring system with applied AC excitation (simplified model) . 8
6.4 Flowmeter/Transmitter output . 9
7 Equipment marking . 9
7.1 Recommended data . 9
7.1.1 Sensor . 9
7.1.2 Transmitter .10
8 Installation design and practice .10
8.1 Sensor .10
8.1.1 Sizing .10
8.1.2 Mounting conditions .11
8.1.3 Potential equalization — General requirements.12
8.1.4 Electrical connections .13
8.1.5 Sensor mounting .13
8.1.6 Installation dimensions for flanged connections .14
8.2 Transmitter location .15
8.3 Operational considerations .16
8.3.1 General.16
8.3.2 Effect of the liquid conductivity .16
8.3.3 Reynolds number effect .16
8.3.4 Velocity profile effect.16
9 Flowmeter calibration, validation, and verification .16
9.1 Flowmeter calibration .16
9.2 Flowmeter verification (in-situ electronic verification) . 16
10 Evaluation of flowmeter performance .17
10.1 General .17
10.2 Applications within the scope of other standards.17
11 Uncertainty analysis .17
Annex A (informative) Materials for construction of sensors .19
Annex B (informative) Practical considerations for measuring system with AC and DC excitation 22
Annex C (informative) Cathodic protection .23
Annex D (informative) Conversion of nominal diameters from metric to US units .24
Annex E (informative) Manufacturers' accuracy specifications.25
Bibliography .
...

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