IEC 60079-29-2:2015
(Main)Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen
Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen
IEC 60079-29-2:2015 is available as IEC 60079-29-2:2015 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60079-29-2:2015 gives guidance on, and recommended practice for, the selection, installation, safe use and maintenance of electrically operated Group II equipment intended for use in industrial and commercial safety applications and Group I equipment in underground coal mines for the detection and measurement of flammable gases complying with the requirements of IEC 60079-29-1 or IEC 60079-29-4. This second edition cancels and replaces the first edition published in 2007. This edition constitutes a technical revision. Please refer to the Foreword of the document for a listing of the changes from the previous edition. Keywords: gas detectors, flammable gases, vapours
Atmosphères explosives - Partie 29-2: Détecteurs de gaz - Sélection, installation, utilisation et maintenance des détecteurs de gaz inflammables et d'oxygène
IEC 60079-29-2:2015 donne des lignes directrices et des recommandations pratiques pour la sélection, l’installation, l’utilisation en toute sécurité et la maintenance des matériels électriques de groupe II destinés à une utilisation dans des applications de sécurité sur des sites industriels et commerciaux, et des matériels de groupe I utilisés dans les mines de charbon souterraines pour la détection et le mesurage des gaz inflammables conformément aux exigences de l'IEC 60079-29-1 ou de l'IEC 60079-29-4.
La présente version bilingue (2017-12) correspond à la version anglaise monolingue publiée en 2015-03.
Cette deuxième édition annule et remplace la première édition parue en 2007. Cette édition constitue une révision technique.
Cette édition inclut les modifications majeures suivantes par rapport à l'édition précédente:
1) Ajout du Groupe 1 au Domaine d’application
2) Ajout de la Détection de gaz à chemin ouvert
3) Ajout d’applications spécifiques
4) Améliorations apportées aux systèmes d’échantillonnage
Mots-clés: détecteurs de gaz, gaz inflammables, vapeurs
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IEC 60079-29-2 ®
Edition 2.0 2015-03
INTERNATIONAL
STANDARD
Explosive atmospheres –
Part 29-2: Gas detectors – Selection, installation, use and maintenance of
detectors for flammable gases and oxygen
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
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documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.
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The advanced search enables to find IEC publications by a More than 60 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,
77, 86 and CISPR.
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IEC 60079-29-2 ®
Edition 2.0 2015-03
INTERNATIONAL
STANDARD
Explosive atmospheres –
Part 29-2: Gas detectors – Selection, installation, use and maintenance of
detectors for flammable gases and oxygen
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-2342-0
– 2 – IEC 60079-29-2:2015 IEC 2015
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 14
3 Terms and definitions . 14
3.1 Gas properties and other physics . 14
3.2 Types of equipment . 16
3.3 Sensors and detectors . 18
3.4 Supply of gas to instruments . 19
3.5 Signals and alarms . 19
3.6 Times, checks and equipment behaviour . 20
3.7 Terms exclusive to open path equipment . 21
4 Basic information on the properties, behaviour, gases and vapours, and specific
applications of gas detection . 23
4.1 Detecting gases and vapours . 23
4.1.1 General . 23
4.1.2 Safety when monitoring for flammable gases where personnel could be
present . 24
4.2 Some common properties of gases and vapours . 25
4.3 The differences between detecting gases and vapours . 26
4.3.1 General . 26
4.3.2 Detection of gases . 26
4.3.3 Detection of vapours . 28
4.4 Oxygen deficiency. 31
4.4.1 General . 31
4.4.2 Chemical reaction of oxygen, with solid products . 31
4.4.3 Chemical reaction of oxygen, with gaseous products . 31
4.4.4 Dilution of the air by displacement by some other gas or vapour . 32
4.5 Specific applications of gas detection . 32
4.5.1 Gas detection as means of reducing risk of explosion . 32
4.5.2 Gas free work permit . 35
4.5.3 Monitoring of air inlets . 36
4.6 Specific considerations for open path detection . 36
5 Measuring principles . 37
5.1 General . 37
5.2 Catalytic sensors . 39
5.2.1 General . 39
5.2.2 Common applications . 39
5.2.3 Limitations . 39
5.2.4 Interferences . 40
5.2.5 Poisoning . 40
5.3 Thermal conductivity sensors . 41
5.3.1 General . 41
5.3.2 Common applications . 41
5.3.3 Limitations . 41
5.3.4 Interferences . 41
5.3.5 Poisoning . 41
5.4 Infrared sensors . 41
5.4.1 General . 41
5.4.2 Common applications . 42
5.4.3 Limitations . 42
5.4.4 Interferences . 42
5.4.5 Poisoning . 42
5.5 Semiconductor sensors . 43
5.5.1 General . 43
5.5.2 Common applications . 43
5.5.3 Limitations . 43
5.5.4 Interferences . 43
5.5.5 Poisoning . 43
5.6 Electrochemical sensors . 44
5.6.1 General . 44
5.6.2 Common applications . 44
5.6.3 Limitations . 44
5.6.4 Interferences . 44
5.6.5 Poisoning . 44
5.7 Flame ionization detectors (FID) . 45
5.7.1 General . 45
5.7.2 Common applications . 45
5.7.3 Limitations . 45
5.7.4 Interferences . 45
5.7.5 Poisoning . 45
5.8 Flame temperature analysers (FTA) . 45
5.8.1 General . 45
5.8.2 Common applications . 45
5.8.3 Limitations . 46
5.8.4 Interferences . 46
5.8.5 Poisoning . 46
5.9 Photo ionisation detector (PID) . 46
5.9.1 General . 46
5.9.2 Common applications . 46
5.9.3 Limitations . 46
5.9.4 Interferences . 46
5.9.5 Poisoning . 47
5.10 Paramagnetic oxygen detector . 47
5.10.1 General . 47
5.10.2 Common applications . 47
5.10.3 Limitations . 47
5.10.4 Interference . 47
5.10.5 Poisoning . 47
6 Selection of equipment . 47
6.1 General . 47
6.2 Selection criteria . 48
6.2.1 General criteria .
...
IEC 60079-29-2 ®
Edition 2.0 2015-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 29-2: Gas detectors – Selection, installation, use and maintenance of
detectors for flammable gases and oxygen
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 21 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - webstore.iec.ch/advsearchform IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 67 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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Centre: sales@iec.ch.
IEC 60079-29-2 ®
Edition 2.0 2015-03
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Explosive atmospheres –
Part 29-2: Gas detectors – Selection, installation, use and maintenance of
detectors for flammable gases and oxygen
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.260.20 ISBN 978-2-8322-2455-7
– 2 – IEC 60079-29-2:2015 RLV IEC 2015
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 14
3 Terms and definitions . 15
3.1 Gas properties and other physics . 15
3.2 Types of equipment . 17
3.3 Sensors and detectors . 18
3.4 Supply of gas to instruments . 20
3.5 Signals and alarms . 20
3.6 Times, checks and equipment behaviour . 21
3.7 Terms exclusive to open path equipment . 22
4 Basic information on the properties, behaviour, and detection of gases and
vapours, and specific applications of gas detection . 24
4.1 Detecting gases and vapours – General . 24
4.1.1 General . 24
4.1.2 Safety when monitoring for flammable gases where personnel could be
present . 25
4.2 Some common properties of gases and vapours . 26
4.3 The differences between detecting gases and vapours . 27
4.3.1 General . 27
4.3.2 Detection of gases . 27
4.3.3 Detection of vapours . 29
4.4 Oxygen deficiency. 32
4.4.1 General . 32
4.4.2 Chemical reaction of oxygen, with solid products . 32
4.4.3 Chemical reaction of oxygen, with gaseous products . 33
4.4.4 Dilution of the air by displacement by some other gas or vapour . 33
4.5 Specific applications of gas detection . 34
4.5.1 Gas detection as means of reducing risk of explosion . 34
4.5.2 Gas free work permit . 36
4.5.3 Monitoring of air inlets . 37
4.6 Specific considerations for open path detection . 38
5 Measuring principles . 39
5.1 General . 39
5.2 Catalytic sensors . 41
5.2.1 General . 41
5.2.2 Common applications . 41
5.2.3 Limitations . 41
5.2.4 Interferences . 42
5.2.5 Poisoning . 42
5.3 Thermal conductivity sensors . 43
5.3.1 General . 43
5.3.2 Common applications . 43
5.3.3 Limitations . 44
5.3.4 Interferences . 44
5.3.5 Poisoning . 44
5.4 Infrared sensors . 44
5.4.1 General . 44
5.4.2 Common applications . 45
5.4.3 Limitations . 45
5.4.4 Interferences . 46
5.4.5 Poisoning . 46
5.5 Semiconductor sensors . 46
5.5.1 General . 46
5.5.2 Common applications . 46
5.5.3 Limitations . 47
5.5.4 Interferences . 47
5.5.5 Poisoning . 47
5.6 Electrochemical sensors . 48
5.6.1 General . 48
5.6.2 Common applications . 48
5.6.3 Limitations . 48
5.6.4 Interferences . 49
5.6.5 Poisoning . 49
5.7 Flame ionization detectors (FID) . 49
5.7.1 General . 49
5.7.2 Common applications . 49
5.7.3 Limitations . 50
5.7.4 Interferences . 50
5.7.5 Poisoning . 50
5.8 Flame temperature analysers (FTA) . 50
5.8.1 General . 50
5.8.2 Common applications . 50
5.8.3 Limitations . 50
5.8.4 Interferences . 51
5.8.5 Poisoning . 51
5.9 Photo ionisation detector (PID) . 51
5.9.1 General . 51
5.9.2 Common applications . 51
5.9.3 Limitations . 51
5.9.4 Interferences . 52
5.9.5 Poisoning . 52
5.10 Paramagnetic oxygen detector . 52
5.10.1 General . 52
5.10.2 Common applications . 52
5.10.3 Limitations . 53
5.10.4 Interference . 53
5.10.5 Poisoning . 53
6 Selection of apparatus equipment . 53
6.1 General . 53
6.2 Selection criteria . 54
6.2.1 General criteria .
...
IEC 60079-29-2 ®
Edition 2.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 29-2: Gas detectors – Selection, installation, use and maintenance of
detectors for flammable gases and oxygen
Atmosphères explosives –
Partie 29-2: Détecteurs de gaz – Sélection, installation, utilisation et maintenance
des détecteurs de gaz inflammables et d’oxygène
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.
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CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.
About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
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IEC 60079-29-2 ®
Edition 2.0 2015-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 29-2: Gas detectors – Selection, installation, use and maintenance of
detectors for flammable gases and oxygen
Atmosphères explosives –
Partie 29-2: Détecteurs de gaz – Sélection, installation, utilisation et maintenance
des détecteurs de gaz inflammables et d’oxygène
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.260.20 ISBN 978-2-8322-5029-7
– 2 – IEC 60079-29-2:2015 IEC 2015
CONTENTS
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 14
3 Terms and definitions . 14
3.1 Gas properties and other physics . 14
3.2 Types of equipment . 16
3.3 Sensors and detectors . 18
3.4 Supply of gas to instruments . 19
3.5 Signals and alarms . 19
3.6 Times, checks and equipment behaviour . 20
3.7 Terms exclusive to open path equipment . 21
4 Basic information on the properties, behaviour, gases and vapours, and specific
applications of gas detection . 23
4.1 Detecting gases and vapours . 23
4.1.1 General . 23
4.1.2 Safety when monitoring for flammable gases where personnel could be
present . 24
4.2 Some common properties of gases and vapours . 25
4.3 The differences between detecting gases and vapours . 26
4.3.1 General . 26
4.3.2 Detection of gases . 26
4.3.3 Detection of vapours . 28
4.4 Oxygen deficiency. 31
4.4.1 General . 31
4.4.2 Chemical reaction of oxygen, with solid products . 31
4.4.3 Chemical reaction of oxygen, with gaseous products . 31
4.4.4 Dilution of the air by displacement by some other gas or vapour . 32
4.5 Specific applications of gas detection . 32
4.5.1 Gas detection as means of reducing risk of explosion . 32
4.5.2 Gas free work permit . 35
4.5.3 Monitoring of air inlets . 36
4.6 Specific considerations for open path detection . 36
5 Measuring principles . 37
5.1 General . 37
5.2 Catalytic sensors . 39
5.2.1 General . 39
5.2.2 Common applications . 39
5.2.3 Limitations . 39
5.2.4 Interferences . 40
5.2.5 Poisoning . 40
5.3 Thermal conductivity sensors . 40
5.3.1 General . 40
5.3.2 Common applications . 41
5.3.3 Limitations . 41
5.3.4 Interferences . 41
5.3.5 Poisoning . 41
5.4 Infrared sensors . 41
5.4.1 General . 41
5.4.2 Common applications . 41
5.4.3 Limitations . 42
5.4.4 Interferences . 42
5.4.5 Poisoning . 42
5.5 Semiconductor sensors . 42
5.5.1 General . 42
5.5.2 Common applications . 42
5.5.3 Limitations . 43
5.5.4 Interferences . 43
5.5.5 Poisoning . 43
5.6 Electrochemical sensors . 43
5.6.1 General . 43
5.6.2 Common applications . 44
5.6.3 Limitations . 44
5.6.4 Interferences . 44
5.6.5 Poisoning . 44
5.7 Flame ionization detectors (FID) . 44
5.7.1 General .
...
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