EN ISO/IEC 80079-20-1:2019

Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data (ISO/IEC 80079-20-1:2017, including Cor 1:2018)

ISO/IEC 80079-20-1:2017 is published as a dual log standard and provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the maximum experimental safe gaps (MESG) for gas-air mixtures or vapour-air mixtures under normal conditions of temperature and pressure (20 °C, 101,3 kPa) so as to permit the selection of an appropriate group of equipment. This document also describes a test method intended for use in the determination of the auto-ignition temperature (AIT) of a vapour-air mixture or gas-air mixture at atmospheric pressure, so as to permit the selection of an appropriate temperature class of equipment. Values of chemical properties of materials are provided to assist in the selection of equipment to be used in hazardous areas. Further data may be added as the results of validated tests become available. The materials and the characteristics included in a table (see Annex B) have been selected with particular reference to the use of equipment in hazardous areas. The data in this document have been taken from a number of references which are given in the bibliography. These methods for determining the MESG or the AIT may also be used for gas-air-inert mixtures or vapour-air-inert mixtures. However, data on air-inert mixtures are not tabulated.
Keywords: classification of gases and vapours, measurement of the maximum experimental safe gaps (MESG)

Explosionsfähige Atmosphären - Teil 20-1: Stoffliche Eigenschaften zur Klassifizierung von Gasen und Dämpfen - Prüfverfahren und Daten (ISO/IEC 80079 20 1:2017, einschließlich Cor 1:2018)

Dieser Teil von ISO/IEC 80079 dient als Hilfestellung bei der Klassifizierung von Gasen und Dämpfen. Er beschreibt ein Prüfverfahren zur Messung der Normspaltweite (NSW) für Gas  oder Dampf-Luft-Gemische unter Laborbedingungen von Temperatur und Druck (20° C; 101,3 kPa) und ermöglicht somit die Einteilung in die zutreffende Explosionsgruppe. Dieses Dokument beschreibt auch ein Prüfverfahren zur Bestimmung der Zündtemperatur (Tz) eines Dampf-Luft-Gemisches oder Gas-Luft-Gemisches bei Atmosphärendruck, um so Geräte der geeigneten Temperaturklasse auszuwählen.
Daten physikochemischer Eigenschaften von Stoffen werden bereitgestellt als Hilfestellung für die Auswahl der in explosionsgefährdeten Bereichen einzusetzenden Geräte. Weitere Daten, die durch validierte Prüfungen erhalten wurden, dürfen künftig hinzugefügt werden.
Die Stoffe und die in einer Tabelle (siehe Anhang B) aufgeführten Eigenschaften wurden vor allem im Hinblick auf den Einsatz von Geräten in explosionsgefährdeten Bereichen ausgewählt. Die Daten in diesem Dokument wurden verschiedener Quellen entnommen, die in den Literaturhinweisen aufgeführt sind.
Die Verfahren zur Bestimmung der NSW oder der Tz dürfen auch für Gas-Luft-Inertgas-Gemische oder Dampf-Luft-Inertgas-Gemische eingesetzt werden. Daten über Luft-Inertgas-Gemische sind jedoch nicht in der Tabelle aufgeführt

Atmosphères explosives - Partie 20-1 : Caractéristiques des produits pour le classement des gaz et des vapeurs - Méthodes et données d'essai (ISO/CEI 80079-20-1:2017, y compris Cor 1:2018)

ISO/IEC 80079-20-1:2017 est publiée en tant que norme sous double logo et donne des recommandations pour le classement des gaz et des vapeurs. Elle décrit une méthode d'essai destinée à mesurer les interstices expérimentaux maximaux de sécurité (IEMS ou MESG – maximum experimental safe gaps) des mélanges gaz-air ou vapeur-air dans des conditions normales de température et de pression (20 °C, 101,3 kPa) afin de pouvoir choisir un groupe approprié d'appareils. Le présent document décrit également une méthode d'essai qui permet d'établir la température d’auto-inflammation (TAI ou AIT – auto-ignition temperature) d'un mélange vapeur-air ou gaz-air à la pression atmosphérique, afin de pouvoir choisir une classe de température appropriée des appareils. Les valeurs des propriétés chimiques des produits sont fournies pour faciliter le choix des appareils à utiliser dans les emplacements dangereux. Des données supplémentaires peuvent être ajoutées au fur et à mesure de l’obtention de résultats d’essai validés. Les produits et les caractéristiques indiqués dans un tableau (voir l’Annexe B) ont été choisis tout particulièrement pour l'utilisation d'appareils dans des emplacements dangereux. Les données fournies dans le présent document sont extraites d’un certain nombre de documents de référence qui sont cités dans la bibliographie. Ces méthodes de détermination de l’IEMS ou d’établissement de la TAI peuvent être également appliquées pour les mélanges gaz-air-matière inerte ou les mélanges vapeur-air-matière inerte. Les données relatives aux mélanges air-matière inerte ne sont toutefois pas fournies.
Mots clés: classement des gaz et des vapeurs, mesurer les interstices expérimentaux maximaux de sécurité (IEMS ou MESG)

Eksplozivne atmosfere - 20-1. del: Lastnosti materiala in razvrstitev za pline in hlape - Preskusne metode in podatki (ISO/IEC 80079-20-1:2017)

Ta del standarda ISO/IEC 80079 podaja smernice glede razvrstitve plinov in hlapov. Opisuje preskusno metodo, namenjeno merjenju največjih poskusnih varnih vrzeli (MESG) za zmesi plinov in zraka ali zmesi hlapov in zraka v normalnih pogojih temperature in tlaka (20 °C, 100 kPa), da se omogoči izbira ustrezne skupine opreme. Standard opisuje tudi preskusno metodo, ki se uporablja za določanje temperature samovžiga (AIT) zmesi hlapov in zraka ali plinov in zraka pri atmosferskem tlaku, da se omogoči izbira ustreznega temperaturnega razreda opreme. Navedene so vrednosti kemijskih lastnosti materialov, ki so namenjene kot pomoč pri izbiri opreme za uporabo v nevarnih območjih. Ko bodo na voljo rezultati potrjenih testov, se lahko dodajo dodatni podatki.  Materiali in značilnosti, vključene v tabelo (glej dodatek B), so bile izbrane s posebnim poudarkom na uporabi opreme v nevarnih območjih. Podatki v tem standardu so vzeti iz številnih referenc, ki so podane v bibliografiji. Te metode za določanje MESG ali AIT se lahko uporabljajo tudi za zmesi plinov, zraka in inertnih plinov ali zmesi hlapov, zraka in inertnih plinov. Vendar podatki o zmeseh zraka in inertnih plinov niso tabelirani.

General Information

• Status: Published
• Publication Date: 22-Oct-2019
• Withdrawal Date: 29-Apr-2022
• ICS: 29.260.20 - Electrical apparatus for explosive atmospheres
• Technical Committee: CEN/TC 305 - Potentially explosive atmospheres - Explosion prevention and protection
• Drafting Committee: CEN/TC 305/WG 1 - Test methods for determining the flammability characteristics of substances (provisional title)
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 23-Oct-2019
• Completion Date: 23-Oct-2019
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Directive: 94/9/EC - Directive 94/9/EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Mandate: M/BC/CEN/92/46 - Standardization mandate assigned to CEN/CENELEC concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: SIST EN ISO/IEC 80079-20-1:2020 - Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data (ISO/IEC 80079-20-1:2017)

Standards Content (Sample)

SLOVENSKI STANDARD
01-februar-2020
Eksplozivne atmosfere - 20-1. del: Lastnosti materiala in razvrstitev za pline in
hlape - Preskusne metode in podatki (ISO/IEC 80079-20-1:2017)
Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour
classification - Test methods and data (ISO/IEC 80079-20-1:2017)
Explosionsfähige Atmosphären - Stoffliche Eigenschaften zur Klassifizierung von Gasen
und Dämpfen - Teil 20-1: Prüfverfahren und Daten (ISO/IEC 80079-20-1:2017)
Atmosphères explosives - Partie 20-1: Caractéristiques des produits pour le classement
des gaz et des vapeurs - Méthodes et données d'essai (ISO/IEC 80079-20-1:2017)
Ta slovenski standard je istoveten z: EN ISO/IEC 80079-20-1:2019
ICS:
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO/IEC 80079-20-1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 60079-20-1:2010
English Version
Explosive atmospheres - Part 20-1: Material
characteristics for gas and vapour classification - Test
methods and data (ISO/IEC 80079-20-1:2017, including
Cor 1:2018)
Atmosphères explosives - Partie 20-1 : Caractéristiques Explosionsfähige Atmosphären - Stoffliche
des produits pour le classement des gaz et des vapeurs Eigenschaften zur Klassifizierung von Gasen und
- Méthodes et données d'essai (ISO/CEI 80079-20- Dämpfen - Teil 20-1: Prüfverfahren und Daten
1:2017, y compris Cor 1:2018) (ISO/IEC 80079-20-1:2017, einschließlich Cor 1:2018)
This European Standard was approved by CEN on 8 January 2018.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 20 November 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 NORMALISATIO N

EUROPÄISCHES KOMITEE FÜR NORMUN G

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/IEC 80079-20-1:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/34/EU aimed to be covered . 4

European foreword
This document (EN ISO/IEC 80079-20-1:2019) has been prepared by Technical Committee ISO/TMB
"Technical Management Board - groups" in collaboration with Technical Committee CEN/TC 305
“Potentially explosive atmospheres - Explosion prevention and protection” the secretariat of which is
held by DIN.
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 2022.
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 60079-20-1:2010.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For the relationship with EU Directive(s) see informative Annex ZA, which is an integral part of this
document.
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/IEC 80079-20-1:2017, including Cor 1:2018 has been approved by CEN as
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2014/34/EU aimed to be covered

This European Standard has been prepared under a Commission’s standardization request
M/BC/CEN/92/46 to provide one voluntary means of conforming to essential requirements of Directive
2014/34/EU “Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February
2014 on the harmonisation of the laws of the Member States relating to equipment and protective
systems intended for use in potentially explosive atmospheres (recast)”.

Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.

Table ZA.1 — Correspondence between this European Standard and Directive 2014/34/EU

Essential Requirements of Clause(s)/sub-clause(s) of Remarks/Notes
Directive 2014/34/EU this EN
1.0.1 All clauses
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
ISO/IEC 80079-20-1
Edition 1.0 2017-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Explosive atmospheres –
Part 20-1: Material characteristics for gas and vapour classification – Test

methods and data
Atmosphères explosives –
Partie 20-1: Caractéristiques des produits pour le classement des gaz et des

vapeurs – Méthodes et données d'essai

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.230; 29.260.20 ISBN 978-2-8322-5164-5

− 2 − ISO/IEC 80079-20-1:2017 © ISO/IEC 2017
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Classification of gases and vapours . 9
4.1 General . 9
4.2 Classification according to the maximum experimental safe gap (MESG) . 9
4.3 Classification according to the minimum igniting current ratio (MIC ratio) . 10
4.4 Classification according to the similarity of chemical structure . 10
4.5 Classification of mixtures of gases . 10
5 Data for flammable gases and vapours, relating to the use of equipment . 11
5.1 Determination of the properties . 11
5.1.1 General . 11
5.1.2 Equipment group . 11
5.1.3 Flammable limits . 11
5.1.4 Flash point (FP) . 11
5.1.5 Temperature class . 12
5.1.6 Minimum igniting current (MIC) . 12
5.1.7 Auto-ignition temperature (AIT) . 12
5.2 Properties of particular gases and vapours . 12
5.2.1 Coke oven gas . 12
5.2.2 Ethyl nitrite . 12
5.2.3 MESG of carbon monoxide . 12
5.2.4 Methane, Equipment Group IIA . 13
6 Method of test for the maximum experimental safe gap (MESG) . 13
6.1 Outline of method . 13
6.2 Test apparatus . 13
6.2.1 General . 13
6.2.2 Material and mechanical strength . 14
6.2.3 Exterior chamber . 14
6.2.4 Interior chamber . 14
6.2.5 Gap adjustment . 14
6.2.6 Injection of mixture . 14
6.2.7 Position of ignition source . 14
6.3 Procedure . 14
6.3.1 Preparation of gas mixtures . 14
6.3.2 Temperature and pressure . 14
6.3.3 Gap adjustment . 15
6.3.4 Ignition . 15
6.3.5 Observation of the ignition process . 15
6.4 Determination of maximum experimental safe gap (MESG) . 15
6.4.1 General . 15
6.4.2 Preliminary tests . 15
6.4.3 Confirmatory tests . 15
6.4.4 Reproducibility of maximum experimental safe gaps (MESG) . 15
6.4.5 Tabulated values . 16

ISO/IEC 80079-20-1:2017 © ISO/IEC 2017 − 3 −
6.5 Verification of the MESG determination method . 16
7 Method of test for auto-ignition temperature (AIT) . 16
7.1 Outline of method . 16
7.2 Apparatus . 16
7.2.1 General . 16
7.2.2 Test vessel and support .
...