SIST EN 60079-29-2:2008

SLOVENSKI STANDARD
SIST EN 60079-29-2:2008
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
SIST EN 60079-29-2:2008 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60079-29-2:2008

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SIST EN 60079-29-2:2008


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

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SIST EN 60079-29-2:2008
EN 60079-29-2:2007 – 2 –
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).
__________

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SIST EN 60079-29-2:2008
– 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.

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SIST EN 60079-29-2:2008

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SIST EN 60079-29-2:2008
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

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SIST EN 60079-29-2:2008
– 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

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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.40
6.2.2 Gases to be detected by the apparatus .41
6.2.3 Intended application of the apparatus.43
6.2.4 Transportable apparatus .44
6.3 Miscellaneous factors affecting selection of apparatus .45
6.3.1 Electromagnetic immunity .45
6.3.2 Intended zone(s) of use .45
7 Behaviour of gas releases.45
7.1 Nature of a release .45
7.1.1 General .45
7.1.2 Release rate of gas or vapour .45
7.1.3 Flammable limits.46
7.1.4 Ventilation .46
7.1.5 Relative density of the released gas or vapour .47
7.1.6 Temperature and/or pressure.47
7.1.7 Other parameters to be considered .47
7.1.8 Outdoor sites and open structures.47
7.2 Buildings and enclosures .48
7.2.1 General .48
7.3 Unventilated buildings and enclosures .48
7.4 Ventilated buildings and enclosures .48
7.5 Natural ventilation.48
7.5.1 Mechanical ventilation.49
7.5.2 Environmental considerations .49
8 Design and installation of fixed gas detection systems.49
8.1 Basic considerations for the installation of fixed systems.50
8.2 Location of detection points .51

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SIST EN 60079-29-2:2008
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8.2.1 General site considerations.51
8.2.2 Environmental conditions .52
8.3 Access for calibration and maintenance .54
8.4 Additional considerations for sample lines.55
8.5 Summary of considerations for the location of sensors or sampling points .55
8.6 Installation of sensors.56
8.7 Integrity and safety of fixed systems .57
8.7.1 General .57
8.7.2 Redundancy in fixed systems .57
8.7.3 Protection against loss of main power supply .57
8.8 Timing of installation during construction operations .58
8.9 Commissioning.58
8.9.1 Inspection.58
8.9.2 Initial gas calibration .58
8.9.3 Adjustment of alarm set points .59
8.10 Operating instructions, plans and records .59
9 Use of portable and transportable flammable gas detection apparatus.60
9.1 General .60
9.2 Initial and periodic check procedures for portable and transportable
instrumentation.61
9.2.1 Inspection and field-check (response check) .61
9.2.2 Routine checks and recalibration.62
9.2.3 Maintenance and recalibration.63
9.3 Guidance on the use of portable and transportable apparatus .64
9.3.1 Electrical safety in hazardous atmospheres .64
9.3.2 Safety of personnel.64
9.3.3 Spot tests and sampling.64
9.3.4 Sampling above liquids .65
9.3.5 Avoidance of condensation .65
9.3.6 Poisoning of sensors.65
9.3.7 Changes of temperature .65
9.3.8 Accidental damage .66
9.3.9 Minimalist operation, the “Read and run” concept .66
10 Training of operational personnel .66
10.1 General .66
10.2 General training – Basic limitations and safety .67
10.3 Operator training .68
10.4 Maintenance training .68
11 Maintenance, routine procedures and general administrative control .68
11.1 General .68
11.2 Operational checks.70
11.2.1 Fixed systems.70
11.2.2 Portable and transportable gas detection apparatus .71
11.3 Maintenance.71
11.3.1 General .71
11.3.2 Fixed apparatus .72
11.3.3 Portable and transportable gas detection apparatus .72
11.3.4 Off-site maintenance, general .72

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11.3.5 Maintenance procedures.72
11.4 Sensors.73
11.4.1 General .73
11.4.2 Flame arrestor .73
11.5 Flow systems.73
11.5.1 General .73
11.5.2 Filters, traps and flame arrestors.73
11.5.3 Flow system and sample chamber.73
11.5.4 Flow connections .73
11.5.5 Moving parts .73
11.5.6 Automatic sample-draw systems .74
11.5.7 Trouble signals .74
11.6 Readout devices.74
11.6.1 General .74
11.6.2 Other readouts.74
11.7 Alarms.74
11.8 Workshop calibration test and equipment.74
11.8.1 Calibration kits and test equipment.74
11.8.2 Conduct of workshop calibration testing .75

Annex A (normative) Measuring principles .77
Annex B (informative) Environmental parameters .97
Annex C (informative) Typical environmental and application check-list for flammable
gas detectors .98
Annex D (informative) Typical instrument maintenance record for flammable gas
detectors. 100

Bibliography . 102

Table 1 – Overview of gas detection apparatus with different measuring principles .27
Table A.1 – Overview of gas detection apparatus with different measuring principles .77
Table B.1 – Environmental parameters .97

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SIST EN 60079-29-2:2008
– 6 – 60079-29-2 © IEC:2007
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

EXPLOSIVE ATMOSPHERES –

Part 29-2: Gas detectors –
Selection, installation, use and maintenance of detectors for flammable
gases and oxygen


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
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8) Attention is drawn to the Normative references cited in this publication. Use
...