EN 60079-29-2:2007

SLOVENSKI STANDARD
01-september-2008
1DGRPHãþD
SIST EN 50073:2000
Eksplozivne atmosfere - 29-2. del: Javljalniki plina - Izbira, vgradnja, uporaba in
vzdrževanje (IEC 60079-29-2:2007)
Explosive atmospheres -- Part 29-2: Gas detectors - Selection, installation, use and
maintenance of detectors for flammable gases and oxygen
Explosionsfähige Atmosphäre -- Teil 29-2: Gasmessgeräte - Auswahl, Installation,
Einsatz und Wartung von Geräten für die Messung von brennbaren Gasen und
Sauerstoff
Atmosphères explosives -- Partie 29-2: Détecteurs de gaz - Sélection, installation,
utilisation et maintenance des détecteurs de gaz inflammables et d'oxygène
Ta slovenski standard je istoveten z: EN 60079-29-2:2007
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 (OHNWULþQLDSDUDWL]D Electrical apparatus for
HNVSOR]LYQDR]UDþMD explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 60079-29-2
NORME EUROPÉENNE
November 2007
EUROPÄISCHE NORM
ICS 29.260.20
English version
Explosive atmospheres -
Part 29-2: Gas detectors -
Selection, installation, use and maintenance of detectors
for flammable gases and oxygen
(IEC 60079-29-2:2007)
Atmosphères explosives -  Explosionsfähige Atmosphäre -
Partie 29-2: Détecteurs de gaz - Teil 29-2: Gasmessgeräte -
Sélection, installation, utilisation Auswahl, Installation, Einsatz und
et maintenance des détecteurs Wartung von Geräten für die Messung
de gaz inflammables et d'oxygène von brennbaren Gasen und Sauerstoff
(CEI 60079-29-2:2007) (IEC 60079-29-2:2007)

This European Standard was approved by CENELEC on 2007-11-01. CENELEC 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 Central Secretariat or to any CENELEC 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 CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60079-29-2:2007 E
Foreword
The text of document 31/696/FDIS, future edition 1 of IEC 60079-29-2, prepared by IEC TC 31,
Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and was
approved by CENELEC as EN 60079-29-2 on 2007-11-01.
This part of EN 60079-29 is to be used in conjunction with the following standards:
– EN 60079-0, Electrical apparatus for explosive gas atmospheres – Part 0: General requirements
– EN 60079-29-1, Explosive atmospheres – Part 29-1: Gas detectors – Performance requirements of
detectors for flammable gases.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2008-11-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-11-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60079-29-2:2007 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60079-19 NOTE Harmonized as EN 60079-19:2007 (not modified).
__________
– 3 – EN 60079-29-2:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
1)
IEC 60050-426 – International Electrotechnical Vocabulary - -
(IEV) -
Chapter 426: Electrical apparatus for
explosive atmospheres
1) 2)
IEC 60079-0 – Electrical apparatus for explosive gas EN 60079-0 2006
(mod) atmospheres -
Part 0: General requirements
1) 2)
IEC 60079-10 – Electrical apparatus for explosive gas EN 60079-10 2003
atmospheres -
Part 10: Classification of hazardous areas

1)
IEC/TR 60079-20 – Electrical apparatus for explosive gas - -
atmospheres -
Part 20: Data for flammable gases and
vapours, relating to the use of electrical
apparatus
1) 2)
IEC 60079-29-1 – Explosive atmospheres - EN 60079-29-1 2007
(mod) Part 29-1: Gas detectors - Performance
requirements of detectors for flammable
gases
1)
Undated reference.
2)
Valid edition at date of issue.

IEC 60079-29-2
Edition 1.0 2007-08
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
PRICE CODE
INTERNATIONALE
XD
CODE PRIX
ICS 29.260.20 ISBN 2-8318-9247-3

– 2 – 60079-29-2 © IEC:2007
CONTENTS
FOREWORD.6
INTRODUCTION.8

1 Scope.10
2 Normative references.11
3 Terms and definitions .11
4 Basic information on the properties, behaviour, and detection of gases and vapours.17
4.1 Detecting gases and vapours – General.17
4.1.1 Safety when monitoring for flammable gases where personnel could
be present .18
4.2 Some common properties of gases and vapours .19
4.3 The differences between detecting gases and vapours.20
4.3.1 Detection of gases .20
4.3.2 Detection of vapours .22
4.4 Oxygen deficiency .25
4.4.1 Chemical reaction of oxygen, with solid products.25
4.4.2 Chemical reaction of oxygen, with gaseous products .25
4.4.3 Dilution of the air by displacement by some other gas or vapour .26
5 Measuring principles .27
5.1 Catalytic sensors .28
5.1.1 Common applications.28
5.1.2 Limitations .28
5.1.3 Interferences .29
5.1.4 Poisoning.29
5.2 Thermal conductivity sensors.30
5.2.1 Common applications.30
5.2.2 Limitations .30
5.2.3 Interferences .31
5.2.4 Poisoning.31
5.3 Infrared sensors .31
5.3.1 Common applications.32
5.3.2 Limitations .32
5.3.3 Interferences .32
5.3.4 Poisoning.32
5.4 Semiconductor sensors .33
5.4.1 Common applications.33
5.4.2 Limitations .33
5.4.3 Interferences .33
5.4.4 Poisoning.34
5.5 Electrochemical sensors .34
5.5.1 Common applications.34
5.5.2 Limitations .34
5.5.3 Interferences .35
5.5.4 Poisoning.35
5.6 Flame ionization detectors (FID) .36
5.6.1 Common applications.36
5.6.2 Limitations .36

60079-29-2 © IEC:2007 – 3 –
5.6.3 Interferences .36
5.6.4 Poisoning.37
5.7 Flame temperature analysers (FTA).37
5.7.1 Common applications.37
5.7.2 Limitations .37
5.7.3 Interferences .37
5.7.4 Poisoning.37
5.8 Photo Ionisation Detector (PID).37
5.8.1 Common applications.38
5.8.2 Limitations .38
5.8.3 Interferences .38
5.8.4 Poisoning.38
5.9 Paramagnetic oxygen detector.39
5.9.1 Common applications.39
5.9.2 Limitations .39
5.9.3 Interference .39
5.9.4 Poisoning.39
6 Selection of apparatus .39
6.1 General .40
6.2 Selection criteria.40
6.2.1 General criteria.
...