kSIST FprEN IEC 60079-29-0:2025
(Main)Explosive atmospheres - Part 29-0: Gas detectors - General requirements and test methods, and possible supplementary parts
Explosive atmospheres - Part 29-0: Gas detectors - General requirements and test methods, and possible supplementary parts
IEC 60079-29-0:2025 specifies general requirements, test methods and acceptance criteria that apply to flammable, oxygen and toxic gas detection equipment intended to detect gases and vapours and to provide an indication, alarm or other output function for personnel or property protection in industrial and commercial applications.
This document applies to the following gas detection equipment:
– Gas detection equipment Type "FL" intended for the detection of flammable gases:
• Type FL-Group I, in mines susceptible to firedamp;
• Type FL-Group II, in locations other than mines susceptible to firedamp; and
• Type FL-OP, open path gas detection equipment for flammable gases.
– Gas detection equipment Type "O2" intended for the detection of Oxygen:
• Type O2-DE, detection of oxygen deficiency or oxygen enrichment; and
• Type O2-IN, inertisation as measuring function for explosion protection.
– Gas detection equipment Type "TX" intended for the detection of toxic gases:
• Type TX-SM, detection in areas for safety monitoring applications and typically using alarm signalling;
• Type TX-HM, occupational exposure measurement in the region of occupational exposure limit values; and
• Type TX-OP, open path gas detection equipment for toxic gases.
This document is not applicable to equipment:
– used for medical applications;
– used only in laboratories for analysis or measurement;
– used only for process monitoring or control purposes (such as a gas analyser);
– used in the domestic environment;
– used in environmental air pollution monitoring;
– used for flue gas analysis;
– used for sampling systems external to the gas detection equipment;
– with samplers and concentrators such as sorbents or paper tape having an irreversible indication;
– consisting of a passive optical receiver without a dedicated optical source;
– equipment within the scope of IEC 60335-2-40 and IEC 60335-2-89.
This first edition of IEC 60079-29-0 cancels and replaces the second edition of 60079-29-1 published in 2016 and its Amendment 1:2020, and the first edition of IEC 60079-29-4 published in 2009. In addition, IEC 60079-29-0 Type TX-SM cancels and replaces Type SM of the first edition of IEC 62990-1.
E DIN EN IEC 60079-29-0 Explosionsgefährdete Bereiche - Teil 29-0: Gaswarngeräte - Allgemeine Anforderungen und Prüfverfahren und mögliche ergänzende Normenteile.
Atmosphères explosives - Partie 29-0: Détecteurs de gaz - Exigences générales et méthodes d’essai, et parties supplémentaires possibles
IEC 60079-29-0:2025 spécifie les exigences générales, les méthodes d’essai et les critères d’acceptation qui s’appliquent aux appareils de détection de gaz inflammables, d’oxygène et de gaz toxiques destinés à détecter des gaz et des vapeurs et à fournir une indication, une alarme ou une autre fonction de sortie pour assurer la protection du personnel ou des biens dans les applications industrielles et commerciales.
Le présent document s’applique aux appareils de détection de gaz suivants:
– type "FL": appareil destiné à la détection des gaz inflammables:
• type FL du groupe I, dans les mines grisouteuses;
• type FL du groupe II, dans les lieux autres que les mines grisouteuses; et
• type FL-OP: appareil de détection de gaz à chemin ouvert pour les gaz inflammables;
– type "O2": appareil destiné à la détection de l’oxygène:
• type O2-DE, détection de l’appauvrissement ou de l’enrichissement en oxygène; et
• type O2-IN, inertage comme fonction de mesure pour la protection contre l’explosion;
– type "TX": appareil destiné à la détection des gaz toxiques:
• type TX-SM, détection dans les zones d’applications de surveillance de la sécurité et utilisant généralement des signaux d’alarme;
• type TX-HM, mesurage de l’exposition professionnelle dans la région des valeurs limites d’exposition professionnelle; et
• type TX-OP: appareil de détection de gaz à chemin ouvert pour les gaz toxiques.
Le présent document ne s’applique pas aux appareils:
– utilisés pour les applications médicales;
– uniquement utilisés pour les analyses ou le mesurage en laboratoire;
– uniquement utilisés à des fins de surveillance ou de contrôle des processus (tel qu’un analyseur de gaz);
– utilisés dans l’environnement domestique;
– utilisés pour surveiller la pollution de l’air environnemental;
– utilisés pour l’analyse des effluents gazeux;
– utilisés pour les systèmes d’échantillonnage externes à l’appareil de détection de gaz;
– équipés d’échantillonneurs et de concentrateurs tels que des sorbants ou une bande de papier portant une indication irréversible;
– constitués d’un récepteur optique passif sans source optique spécifique;
– entrant dans le domaine d’application de l’IEC 60335-2-40 et de l’IEC 60335-2-89
Cette première édition de l’IEC 60079-29-0 annule et remplace la seconde édition de l’IEC 60079-29-1 parue en 2016 et son Amendement 1:2020, ainsi que la première édition de l’IEC 60079-29-4 parue en 2009. De plus, le type TX-SM de l’IEC 60079-29-0 annule et remplace le type SM de la première édition de l’IEC 62990-1; cependant, le type TX-HM restera dans le norme.
Eksplozivne atmosfere - 29-0. del: Javljalniki plina - Splošne zahteve in preskusne metode in morebitni dodatni deli
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN IEC 60079-29-0:2024
01-september-2024
Eksplozivne atmosfere - 29-0. del: Javljalniki plina - Splošne zahteve in preskusne
metode, in morebitni dodatni deli
Explosive atmospheres - Part 29-0: Gas detectors - General requirements and test
methods, and possible supplementary parts
Ta slovenski standard je istoveten z: prEN IEC 60079-29-0:2024
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
oSIST prEN IEC 60079-29-0:2024 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN IEC 60079-29-0:2024
oSIST prEN IEC 60079-29-0:2024
31/1784/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-29-0 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2024-07-12 2024-10-04
SUPERSEDES DOCUMENTS:
31/1757/CD, 31/1765B/CC
IEC TC 31 : EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
SECRETARIAT: SECRETARY:
United Kingdom Mr Tom Stack
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in this
CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Explosive atmospheres - Part 29-0: Gas detectors - General requirements and test methods, and
possible supplementary parts.
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without
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oSIST prEN IEC 60079-29-0:2024
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1 CONTENTS .5
2 FOREWORD . 5
3 INTRODUCTION . 7
4 1 Scope . 8
5 2 Normative references . 9
6 3 Terms and definitions . 9
7 4 General requirements . 16
8 4.1 Introduction . 16
9 4.2 Design . 17
10 4.2.1 General . 17
11 4.2.2 Indicators and means of indication . 17
12 4.2.3 Alarm signal(s) . 19
13 4.2.4 Fault signals . 20
14 4.2.5 Special state indication . 20
15 4.2.6 Adjustments . 21
16 4.2.7 Battery-powered equipment . 21
17 4.2.8 Software-controlled equipment . 21
18 4.3 Labelling and marking . 22
19 4.4 Instructions . 22
20 5 Test methods . 26
21 5.1 General . 26
22 5.2 General requirements for tests . 26
23 5.2.1 Samples and sequence of tests . 26
24 5.2.2 Preparation of equipment before testing . 28
25 5.2.3 Mask for calibration and test . 28
26 5.2.4 Open path gas detection equipment . 29
27 5.3 Normal conditions for test . 31
28 5.3.1 General . 31
29 5.3.2 Test gas(es) . 31
30 5.3.3 Flow rate for test gases . 33
31 5.3.4 Power supply . 33
32 5.3.5 Temperature . 33
33 5.3.6 Pressure . 33
34 5.3.7 Humidity . 33
35 5.3.8 Acclimation time . 34
36 5.3.9 Orientation . 34
37 5.3.10 Communications options . 34
38 5.4 Tests . 34
39 5.4.1 General . 34
40 5.4.2 Unpowered storage . 35
41 5.4.3 Vibration . 35
42 5.4.4 Drop test . 36
43 5.4.5 Calibration kit . 37
44 5.4.6 Linearity . 37
45 5.4.7 Alarm set-point(s) . 37
46 5.4.8 Stability . 39
47 5.4.9 Gas concentrations above the upper limit of indication . 39
48 5.4.10 Poisons and other gases . 41
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49 5.4.11 Temperature . 42
50 5.4.12 Pressure . 43
51 5.4.13 Humidity of test gas . 43
52 5.4.14 Air velocity (diffusion equipment only) . 44
53 5.4.15 Flow rate (aspirated equipment only) . 44
54 5.4.16 Warm-up time . 45
55 5.4.17 Time of response . 45
56 5.4.18 Time of recovery . 46
57 5.4.19 Sampling probe . 46
58 5.4.20 Operation at or below the lower limit of measurement (type O2-IN
59 oxygen detection equipment only) . 46
60 5.4.21 Extended operation in test gas (Type TX equipment only). 46
61 5.4.22 Orientation . 47
62 5.4.23 Battery capacity for battery-powered equipment . 47
63 5.4.24 Power supply variations for externally powered equipment . 48
64 5.4.25 Electromagnetic immunity . 48
65 5.4.26 Fault signal tests . 50
66 5.4.27 Software controlled equipment . 52
67 5.4.28 Environmental protection . 52
68 5.4.29 Beam block fault (Optical sensors) . 54
69 5.4.30 Water vapour interference (Open path only) . 54
70 5.4.31 Alignment (Open path only) . 54
71 5.4.32 Partial obscuration (Open path only) . 55
72 5.4.33 Long range operation (Open path only) . 55
73 5.4.34 Direct solar radiation (Open path only) . 55
74 5.4.35 Signal intensity variation (Open path topographic reflection only) . 56
75 5.4.36 Scanning performance (Open path topographic reflection only) . 56
76 Annex A (normative) Acceptance Criterion for Type FL Equipment . 57
77 A.1 Type FL-Group I equipment . 57
78 A.2 Type FL-Group II equipment . 59
79 A.3 Type FL-Group II Hydrogen gas detection equipment . 61
80 Annex B (normative) Acceptance Criterion for Type O2 Equipment . 65
81 B.1 Type O2 equipment (Type O2-DE & Type O2-IN) . 65
82 Annex C (normative) Acceptance Criterion for Type TX Equipment . 68
83 C.1 Type TX equipment (Type TX-SM & Type TX-HM) . 68
84 Annex D (normative) Acceptance Criterion for Open Path Gas Detection Equipment. 71
85 D.1 Open path gas detection equipment (Type FL-OP and TX-OP) . 71
86 Annex E (normative) Gas specific performance requirements . 73
87 Annex F (normative) Determination of time of response and time of recovery . 75
88 F.1 Calculation of response and recovery times . 75
89 F.2 Underdamped responses . 75
90 F.3 Pressure, temperature and gas velocities. 78
91 F.4 Diffusion equipment . 79
92 F.4.1 Experimental arrangements . 79
93 F.4.2 Calibration mask method 1 . 79
94 F.4.3 Calibration mask method 2 . 80
95 F.4.4 Flow method . 81
96 F.4.5 Injection method . 82
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97 F.5 Aspirated equipment . 82
98 F.5.1 Test rig . 82
99 F.5.2 Equipment without internal pump . 82
100 F.5.3 Equipment with internal pump . 83
101 F.6 Open path detection equipment . 83
102 F.6.1 Measuring equipment .
103 Annex G (informative) Open Path Gas Detection Equipment Water Vapour Test
104 Apparatus . 85
105 G.1 Open path gas detection equipment water vapour test apparatus . 85
106 Bibliography . 86
109 Table 1 – Indicators . 17
110 Table 2 – Test samples and sequence of tests . 27
111 Table A.1 – Acceptance Criterion for Type FL-Group I Equipment . 57
112 Table A.2 – Acceptance Criterion for Type FL-Group II Equipment . 59
113 Table A.3 – Acceptance Criterion for Type FL-Group II Hydrogen Gas Detection
114 Equipment . 61
115 Table B.1 – Acceptance Criterion for Type O2 Equipment (Type O2-DE & Type O2-IN) . 65
116 Table C.1 – Acceptance Criterion for Type TX Equipment (Type TX-SM & Type TX-HM) . 68
117 Table D.1 – Acceptance Criterion for Open Path Gas Detection Equipment (Type FL-
118 OP & Type TX-OP) . 71
119 Table E.1 – Gas specific performance requirements . 73
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123 INTERNATIONAL ELECTROTECHNICAL COMMISSION
124 ____________
128 EXPLOSIVE ATMOSPHERES - Part 29-0: Gas detection equipment –
129 General requirements and test methods
131 FOREWORD
132 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
133 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
134 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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140 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
141 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
142 consensus of opinion on the relevant subjects since each technical committee has representation from all
143 interested IEC National Committees.
144 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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146 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
147 misinterpretation by any end user.
148 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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150 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
151 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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153 services carried out by independent certification bodies.
154 6) All users should ensure that they have the latest edition of this publication.
155 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
156 members of its technical committees and IEC National Committees for any personal injury, property damage or
157 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
158 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
159 Publications.
160 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
161 indispensable for the correct application of this publication.
162 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
163 rights. IEC shall not be held responsible for identifying any or all such patent rights.
164 International Standard IEC 60079-29-0 has been prepared by the IEC technical committee 31:
165 Equipment for explosive atmospheres.
166 The text of this International Standard is based on the following documents:
FDIS Report on voting
168 Full information on the voting for its approval can be found in the report on voting indicated in
169 the above table.
170 The language used for the development of this International Standard is English.
171 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
172 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
oSIST prEN IEC 60079-29-0:2024
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173 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
174 described in greater detail at www.iec.ch/publications.
175 Users of this document are advised that interpretation sheets clarifying the interpretation of this
176 document can be published. Interpretation sheets are available from the IEC webstore and can
177 be found in the “history” tab of the page for each document.
178 A list of all parts in the IEC 60079-29 series can be found on the IEC website.
179 The committee has decided that the contents of this document will remain unchanged until the
180 stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
181 the specific document. At this date, the document will be
182 • reconfirmed,
183 • withdrawn,
184 • replaced by a revised edition, or
185 • amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
oSIST prEN IEC 60079-29-0:2024
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189 INTRODUCTION
191 This part of IEC 60079-29 is prepared for combining the requirements for flammable, oxygen
192 and toxic gas detection equipment to be used in industrial or commercial applications and
193 intended to measure the concentration or the integral concentration of gases and vapours to
194 provide an indication, alarm or other output functions for personnel safety or property protection.
195 This document also includes test methods and acceptance criteria for performance of gas
196 detection equipment whose primary purpose is to provide an indication, alarm or other output
197 function.
198 Because a wide range of conditions can be encountered in practice, this part specifies
199 requirements to be fulfilled by gas detection equipment when tested under prescribed laboratory
200 conditions.
201 General and performance requirements for toxic gas detection equipment intended for
202 occupational exposure measurement in the region of Occupational Exposure Limit Values is set
203 out in IEC 62990-1 as for Type HM gas detection equipment.
204 Consideration should also be given to the following relevant standards:
205 IEC 60079-29-2: Explosive atmospheres – Part 29-2, Gas detectors – Selection, installation,
206 use and maintenance of detectors for flammable gases and oxygen.
207 IEC 62990-2: Workplace atmospheres — Part 2: Gas detectors — Selection, installation, use
208 and maintenance of detectors for toxic gases and vapours.
209 IEC 60079-29-3: Explosive atmospheres – Part 29-3, Gas detectors – Guidance on functional
210 safety of fixed gas detection systems.
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214 Part 29-0: Gas detection equipment –
215 General requirements and test methods
219 1 Scope
220 This part of IEC 60079-29 specifies general requirements, test methods and acceptance criteria
221 that apply to flammable, oxygen and toxic gas detection equipment intended to detect gases
222 and vapours and to provide an indication, alarm or other output function for personnel or
223 property protection in industrial and commercial applications.
224 NOTE 1 The term Gas Detection Equipment is often referred to as the term Gas Detector.
225 NOTE 2 The term ‘gas’ and ‘gases’ used in this document are also intended to include ‘vapour’ and ‘vapours’.
226 This document applies to the following gas detection equipment:
227 • Gas detection equipment Type “FL” intended for the detection of flammable gases:
228 − Group I, in mines susceptible to firedamp;
229 − Group II, in locations other than mines susceptible to firedamp; and
230 − Type FL-OP, open path gas detection equipment for flammable gases.
231 • Gas detection equipment Type “O2” intended for the detection of Oxygen:
232 − Type O2-DE, detection of oxygen deficiency or oxygen enrichment; and
233 − Type O2-IN, inertisation as measuring function for explosion protection.
234 NOTE 3 Inertisation is an explosion protection technique where an explosive atmosphere is purged with
235 inert gas.
236 • Gas detection equipment Type “TX” intended for the detection of toxic gases:
237 − Type TX-SM, detection in areas for general applications (for example, safety monitoring,
238 leak detection), and typically using alarm signalling;
239 − Type TX-HM, occupational exposure measurement in the region of occupational
240 exposure limit values; and
241 NOTE 4 Type TX-HM gas detection equipment performance requirements reside in IEC 62990-1.
242 − Type TX-OP, open path gas detection equipment for toxic gases.
243 NOTE 5 This standard addresses equipment giving a level of performance suitable for general purpose applications.
244 Specific applications might additionally require equipment to be submitted for particular tests or approval. Such tests
245 or approval are regarded as additional to and separate from the compliance with this document.
246 This document is not applicable to equipment:
247 – used for medical applications;
248 – used only in laboratories for analysis or measurement;
249 – used only for process monitoring or control purposes (such as a gas analyser);
250 – used in the domestic environment;
251 – used in environmental air pollution monitoring;
252 – used for flue gas analysis;
253 – used for sampling systems external to the gas detection equipment;
254 – with samplers and concentrators such as sorbents or paper tape having an irreversible
255 indication;
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256 – consisting of a passive optical receiver without a dedicated optical source.
257 2 Normative references
258 The following documents are referred to in the text in such a way that some or all of their content
259 constitutes requirements of this document. For dated references, only the edition cited applies.
260 For undated references, the latest edition of the referenced document (including any
261 amendments) applies.
262 IEC 62990-1, Workplace atmospheres - Part 1: Gas detectors - Performance requirements of
263 detectors for toxic gases
264 IEC 62990-2, Workplace atmospheres – Part 2: Gas detectors – Selection, installation, use and
265 maintenance of detectors for toxic gases and vapours
266 IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
267 IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
268 IEC 60529, Degrees of protection provided by enclosures (IP Code)
269 IEC 61000-4-29, Electromagnetic compatibility (EMC) – Part 4-29: Testing and measurement
270 techniques – Voltage dips, short interruptions and voltage variations on d.c. input power port
271 immunity tests
272 IEC 61326-1:2020, Electrical equipment for measurement, control and laboratory use – EMC
273 requirements – Part 1: General requirements
274 IEC 80079-20-1, Explosive atmospheres – Part 20: Material characteristics for gas and vapour
275 classification, Section 1: Test methods and data
276 3 Terms and definitions
277 For the purposes of this document, the following terms and definitions apply.
278 ISO and IEC maintain terminology databases for use in standardization at the following
279 addresses:
280 • IEC Electropedia: available at https://www.electropedia.org/
281 • ISO Online browsing platform: available at https://www.iso.org/obp
282 3.1
283 gas properties
284 3.1.1
285 ambient air,
286 normal atmosphere surrounding the equipment
287 3.1.2
288 clean air,
289 air that is free of gases or vapours to which the sensor is sensitive or which influence the
290 performance of the sensor
291 3.1.3
292 reference air,
293 air with an oxygen volume fraction of (21 ± 0,4) %
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294 3.1.4
295 zero test gas,
296 gas, that is free of the gas(es) to be measured and interfering and contaminating substances,
297 the purpose of which is calibration/adjustment of the equipment zero
298 3.1.5
299 standard test gas,
300 test gas with a composition specified to be used for all tests unless otherwise stated
301 3.1.6
302 flammable gas,
303 DEPRECATED: combustible gas
304 gas or vapour which, when mixed with air in a certain proportion, will form an explosive
305 atmosphere
306 Note 1 to entry: For the purposes of this part of IEC 60079-29, the term "flammable gas" includes flammable
307 vapours.
308 [SOURCE: IEC 600790-10-1:2020 with “or vapour” dropped from term and one note to entry added. Admitted and
309 deprecated terms also added]
310 3.1.7
311 toxic gas,
312 gas or vapour that can be harmful to human health and/or the performance of persons due to
313 its physical or physico-chemical properties
314 3.1.8
315 poisons,
316 substances that lead to temporary or permanent change of
317 performance, particularly loss of sensitivity of the sensing element
318 3.1.9
319 volume fraction (V/V)
320 quotient of the volume of a specified component and the sum of the volumes of all components
321 of a gas mixture before mixing
322 Note 1 to entry: The volume fraction and volume concentration take the same value if, at the same state conditions,
323 the sum of the component volumes before mixing and the volume of the mixture are equal. However, because the
324 mixing of two or more gases at the same state conditions is usually accompanied by a slight contraction or, less
325 frequently, a slight expansion, this is not generally the case.
326 Note 2 to entry: All volumes are with respect to the pressure and the temperature of the gas mixture .
327 3.2
328 structure (or composition) of gas detection equipment
329 3.2.1
330 alarm-only equipment,
331 equipment with an alarm but not having an indication of measured value
332 3.2.2
333 aspirated equipment,
334 equipment that samples the gas by drawing it to the gas sensor
335 Note 1 to entry: A hand operated or electric pump is often used to draw gas to the sensor.
336 3.2.3
337 automatically aspirated equipment,
338 aspirated equipment with an integral pump or separate pump, which is connected directly to the
339 equipment
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340 3.2.4
341 diffusion equipment,
342 equipment in which the transfer of gas from the atmosphere to the sensor takes place without
343 aspirated flow
344 3.2.5
345 fixed equipment
346 equipment fastened to a support, or otherwise secured in a specific location when energized
347 [SOURCE: IEC 60079-0:2017]
348 3.2.6
349 portable equipment,
350 equipment intended to be carried by a person during its operation
351 Note 1 to entry: Portable equipment carried by a person during its operation is sometimes referred to as hand -held
352 equipment.
353 Note 2 to entry: Hand-held gas detection equipment, typically less than 1 kg, requires use of only one hand to operate.
354 Larger equipment that can be operated by the user while it is carried either by hand, by a shoulder strap or carrying
355 harness, can be equipped with or without a hand directed probe.
356 [SOURCE: IEC 60079-0:2017 with addition of Note 2 to entry]
357 3.2.7
358 transportable equipment
359 equipment not intended to be carried by a person during operation, nor intended for fixed
360 installation
361 [SOURCE: IEC 60079-0:2017]
362 3.2.8
363 gas detection transmitter
364 fixed gas detection equipment that provides a conditioned electronic signal or output indication
365 to a generally accepted industry standard (such as 4-20 mA), intended to be utilized with
366 separate gas detection control units or signal processing data acquisition, central monitoring
367 and similar systems, which typically process information from various locations and sources
368 including, but not limited to gas detection equipment
369 3.2.9
370 gas detection control unit
371 equipment intended to provide display indication, alarm functions, output contacts or alarm
372 signal outputs or any combination when operated with remote sensor(s)
373 3.2.10
374 separate gas detection control unit
375 equipment intended to provide display indication, alarm functions, output contacts or alarm
376 signal outputs or any combination when operated with gas detection transmitter(s)
377 3.2.11
378 equipment with integral sensor(s),
379 equipment that provides display indication, alarm functions, output contacts or alarm signal
380 outputs using a sensor which is within or directly assembled to the equipment housing
381 3.2.12
382 accessory,
383 component which can be fitted to the equipment for a special purpose and that is referenced in
384 the instructions
385 EXAMPLE: External gas pump, sampling probe, hoses, collecting cone, weather protection device.
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386 3.3
387 sensors
388 3.3.1
389 sensing element,
390 part of the sensor that is sensitive to the gas or vapour to be measured
391 3.3.2
392 measuring principle,
393 principle that makes the sensing element or the sensor sensitive to the gas or vapour to be
394 measured
395 3.3.3
396 sensor,
397 assembly in which the sensing element is housed and that may also contain associated circuit
398 components
399 3.3.4
400 integral sensor,
401 sensor that is within or directly assembled to the a gas detection control unit, gas, detection
402 transmitter, or to transportable or portable equipment
403 3.3.5
404 remote sensor,
405 sensor that is installed separately, but is connected to a gas detection control unit, gas detection
406 transmitter, or to transportable or portable equipment
407 3.4
408 supply of gas to equipment
409 3.4.1
410 sample line,
411 means by which the gas being sampled is conveyed to the sensor
412 Note 1 to entry: Accessories such as filters or water traps are often included in the sample line.
413 3.4.2
414 sampling probe,
415 separate accessory sample line that is optionally attached to the equipment
416 3.4.3
417 Adjustment,
418 procedure carried out to minimize the deviation of the indication from the test gas concentration
419 Note 1 to entry: When the equipment is adjusted to give an indication of zero in zero test gas, the procedure is
420 called ’zero adjustment’.
421 3.4.4
422 calibration,
423 procedure that establishes the relationship between an indication and the concentration of a
424 test gas
425 3.4.5
426 calibration kit,
427 means of presenting test gas to the equipment for the purpose of calibrating, adjusting or
428 verifying the operation of the equipment
429 Note 1 to entry: The calibration kit can be used for verifying the operation of the alarms if the concentration of the
430 test gas is beyond the alarm set-point.
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431 3.4.6
432 mask for calibration and test,
433 device that can be attached to the equipment to present a test gas to the sensor in a
434 reproducible manner
435 3.5
436 signals and alarms
437 3.5.1
438 measured value,
439 calculated concentration of gas or vapour that results from processing the sensor signal
440 Note 1 to entry: The measured value can be further processed before indication on output or display
441 (for example, filtering, averaging, suppression of indication).
442 3.5.2
443 indication,
444 representation of the measured value on an output or display
445 3.5.3
446 indication range,
447 range of indications over which the equipment is capable of indicating
448 SEE Figure 1.
449 3.5.4
450 lower limit of indication,
451 smallest indication within the indication range
452 SEE Figure 1.
453 3.5.5
454 upper limit of indication,
455 largest indication within the indication range
456 SEE Figure 1.
457 3.5.6
458 measuring range,
459 range of indications of gas concentration over which the accuracy of the equipment lies within
460 specified limits
461 SEE Figure 1.
462 3.5.7
463 lower limit of measurement,
464 smallest measured value within the measuring range
465 SEE Figure 1.
466 Note 1 to entry: Lower limit of measuring range can be zero.
467 3.5.8
468 upper limit of measurement,
469 largest measured value within the measuring range
470 SEE Figure 1.
471 Note 1 to entry: Indications below the lower limit of measurement or above the upper limit of measurement will not
472 necessarily meet the requirements of this document.
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Lower limit of indication
Upper limit of indication
Zero
Indication range
Measuring range
Lower limit of measurement Upper limit of measurement
IEC
474 Figure 1 – Relationship between indication range and measuring range
475 3.5.9
476 alarm set point,
477 setting of the equipment at which the measured concentration will cause the equipment to
478 initiate an indication, alarm or other output function
479 3.5.10
480 latching alarm,
481 alarm that, once activated, requires deliberate action to be deactivated
482 3.5.11
483 fault signal,
484 audible, visible or other type of output, different from the alarm signal, permitting, directly or
485 indirectly, a warning or indication that the equipment is not working satisfactorily
486 3.5.12
487 special state,
488 state of the equipment other than that in which the intent is monitoring of gas concentration or
489 alarming
490 Note 1 to entry: Special state includes warm-up, calibration mode and fault condition.
491 3.6
492 times
493 3.6.1
494 drift,
495 variation in the equipment indication over time at any fixed gas volume fraction (including clean
496 air) under constant ambient conditions
497 3.6.2
498 final indication,
499 indication given by the equipment after stabilization
500 3.6.3
501 time of response/recovery,
502 t(x)
503 time interval, with the equipment in a warmed-up condition, between the time when an
504 instantaneous concentration change between two test gases is produced at the equipment inlet,
505 and the time when the indication reaches a stated percentage (x) of the differences of the two
506 indications
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507 3.6.4
508 warm-up time,
509 time interval, with the equipment in a stated atmosphere, between the time when the equipment
510 is switched on and the time when the indication reaches and remains within the stated
511 tolerances
512 Note 1 to entry: See equipment warm-up time in Figures 2 and 3.
Power off in Power on in
clean air clean air
Specified
Equipment
tolerance band
zero
on zero indication
Time
Warm-up time
(see 3.6.5)
IEC
514 Figure 2 – Warm-up time in clean air (typical)
Power off Power on
in standard in standard
test gas test gas
Specified
Volume
tolerances of
fraction
the indication
of standard
test gas
Zero in
clean air
Time
Warm-up time
(see 3.6.5)
IEC
516 Figure 3 – Warm-up time in standard test gas (typical)
517 3.7
518 open path gas detection equipment
519 The following definitions are specific to open path gas detection equipment and supplement
520 other definitions in this section that are relevant to open path gas detection equipment.
521 3.7.1
522 beam block signal,
523 audible, visual or other type of output which provides, directly or indirectly, a warning or
524 indication that the optical path is obscured or that the signal detected is too weak to enable the
525 equipment to function normally
Indication
Indication
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526 3.7.2
527 inhibition signal, directly or indirectly,
528 audible, visual, or other type of output which provides a warning or indication that normal
529 operation has been suspended
530 3.7.3
531 integral concentration,
532 mathematical integral of the gas concentration along the optical path.
533 Note 1 to entry: It is expressed in units of concentration multiplied by distance; for example, LFL•metre for flammable
534 gases or ppm•metre for toxic gases
535 Note 2 to entry: 100 % LFL x 1 metre = 1 LFL•metre; 10 % LFL 10 metre = 1 LFL•metre.
536 3.7.4
537 open path,
538 the space in which the atmosphere is being monitored and through which gases in the
539 atmosphere are free to move
540 3.7.5
541 optical axis,
542 median line of the optical path
543 3.7.6
544 optical path,
545 path traversed by optical radiation from an optical transmitter to an optical receiver.
546 Note 1 to entry: The radiation can traverse the open path once, twice or many times depending on the form taken
547 by the instrument.
548 3.7.7
549 open path transmitter,
550 assembly in which the optical transmitting element(s) are housed and which may contain
551 associated optical and electrical components
552 3.7.8
553 open path transceiver,
554 assembly in which the optical detecting element(s) and optical transmitting element(s) are
555 housed and which may contain associated optical and electrical components
556 3.7.9
557 open path receiver,
558 assembly in which the optical detecting element(s) are housed and which may contain
559 associated optical and electrical components
560 4 General requirements
561 4.1 Introduction
562 In addition to the requirements of this document, gas detection equipment intended for use in
563 explosive atmospheres shall comply with the relevant requirements of IEC 60079-0 and the
564 applicable Type(s) of Protection standards. The ambient temperature and pressure ranges of
565 such equipment conformin
...
SLOVENSKI STANDARD
oSIST prEN IEC 60079-29-0:2025
01-april-2025
Eksplozivne atmosfere - 29-0. del: Javljalniki plina - Splošne zahteve in preskusne
metode in morebitni dodatni deli
Explosive atmospheres - Part 29-0: Gas detectors - General requirements and test
methods, and possible supplementary parts
E DIN EN IEC 60079-29-0 Explosionsgefährdete Bereiche - Teil 29-0: Gaswarngeräte -
Allgemeine Anforderungen und Prüfverfahren und mögliche ergänzende Normenteile.
Atmosphères explosives - Partie 29-0: Détecteurs de gaz - Exigences générales et
méthodes d’essai, et parties supplémentaires possibles
Ta slovenski standard je istoveten z: prEN IEC 60079-29-0:2025
ICS:
13.320 Alarmni in opozorilni sistemi Alarm and warning systems
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
oSIST prEN IEC 60079-29-0:2025 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN IEC 60079-29-0:2025
oSIST prEN IEC 60079-29-0:2025
31/1846/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60079-29-0 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2025-02-07 2025-04-04
SUPERSEDES DOCUMENTS:
31/1784/CDV, 31/1845/RVC
IEC TC 31 : EQUIPMENT FOR EXPLOSIVE ATMOSPHERES
SECRETARIAT: SECRETARY:
United Kingdom Mr Tom Stack
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):
ASPECTS CONCERNED:
Safety
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of CENELEC,
is drawn to the fact that this Committee Draft for Vote (CDV) is
submitted for parallel voting.
The CENELEC members are invited to vote through the CENELEC
online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which t hey are
aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries” clau ses to be
included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for submitting ISC c lauses. (SEE
AC/22/2007 OR NEW GUIDANCE DOC).
TITLE:
Explosive atmospheres - Part 29-0: Gas detectors - General requirements and test methods, and possible
supplementary parts.
PROPOSED STABILITY DATE: 2029
NOTE FROM TC/SC OFFICERS:
Please refer to 31/1847/INF for the circulation of the CDV with track changes.
file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions. You may not copy
or "mirror" the file or printed version of the document, or any part of it, for any other purpose without permission in writi ng from IEC.
oSIST prEN IEC 60079-29-0:2025
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1 CONTENTS
2 FOREWORD . 5
3 INTRODUCTION . 7
4 1 Scope . 8
5 2 Normative references . 9
6 3 Terms and definitions . 9
7 3.1 Gas properties . 9
8 3.2 Structure (or composition) of gas detection equipment . 10
9 3.3 Sensors . 12
10 3.4 Supply of gas to equipment . 12
11 3.5 Signals and alarms . 13
12 3.6 Times. 15
13 3.7 Open path gas detection equipment and fixed point infrared detectors . 16
14 4 General requirements . 18
15 4.1 Overview. 18
16 4.2 Design . 18
17 4.2.1 General . 18
18 4.2.2 Indicators and means of indication . 19
19 4.2.3 Alarm signal(s) . 21
20 4.2.4 Fault signals . 21
21 4.2.5 Special state indication . 22
22 4.2.6 Adjustments . 22
23 4.2.7 Battery-powered equipment . 22
24 4.2.8 Software-controlled equipment . 22
25 4.3 Marking . 24
26 4.4 Instructions . 24
27 5 Test methods . 27
28 5.1 General . 27
29 5.2 General requirements for tests . 27
30 5.2.1 Samples and sequence of tests . 27
31 5.2.2 Preparation of equipment before testing (All Types excluding FL-OP
32 and TX-OP) . 29
33 5.2.3 Preparation of equipment before testing (Types FL-OP and TX-OP) . 30
34 5.3 Normal conditions for test . 33
35 5.3.1 General . 33
36 5.3.2 Test gas(es) . 33
37 5.3.3 Flow rate for test gases . 34
38 5.3.4 Power supply . 34
39 5.3.5 Temperature . 35
40 5.3.6 Pressure . 35
41 5.3.7 Humidity . 35
42 5.3.8 Acclimation time . 35
43 5.3.9 Orientation . 35
44 5.3.10 Communications options . 35
45 5.4 Tests . 35
46 5.4.1 General . 35
47 5.4.2 Unpowered storage . 36
48 5.4.3 Vibration . 37
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49 5.4.4 Drop test . 38
50 5.4.5 Calibration kit . 38
51 5.4.6 Linearity . 39
52 5.4.7 Alarm set-point(s) . 39
53 5.4.8 Stability . 40
54 5.4.9 Gas concentrations above the upper limit of indication . 42
55 5.4.10 Poisons and other gases . 43
56 5.4.11 Temperature . 44
57 5.4.12 Pressure (equipment with sensors only) . 46
58 5.4.13 Humidity of test gas . 46
59 5.4.14 Air velocity (diffusion equipment only) . 46
60 5.4.15 Flow rate (aspirated equipment only) . 47
61 5.4.16 Warm-up time . 47
62 5.4.17 Time of response . 48
63 5.4.18 Time of recovery . 48
64 5.4.19 Sampling probe . 48
65 5.4.20 Operation at or below the lower limit of measurement (Type O2-DE
66 only) . 49
67 5.4.21 Extended operation in test gas (Type TX only) . 49
68 5.4.22 Orientation . 49
69 5.4.23 Battery capacity for battery-powered equipment . 50
70 5.4.24 Power supply variations for externally powered equipment . 51
71 5.4.25 Electromagnetic immunity . 51
72 5.4.26 Fault signal tests . 53
73 5.4.27 Software controlled equipment . 55
74 5.4.28 Environmental protection . 55
75 5.4.29 Beam block fault (open path except for topographic reflection) . 56
76 5.4.30 Water vapour interference (Open path only) . 57
77 5.4.31 Alignment (Open path only except for topographic detectors) . 57
78 5.4.32 Partial obscuration (Open path only) . 57
79 5.4.33 Long range operation (Open path only) . 57
80 5.4.34 Direct solar radiation (Open path only) . 58
81 5.4.35 Signal intensity variation (Open path topographic reflection only) . 58
82 5.4.36 Scanning performance (Open path topographic reflection only) . 58
83 Annex A (normative) Acceptance criteria for Type FL . 59
84 A.1 Type FL-Group I . 59
85 A.2 Type FL-Group II . 61
86 A.3 Type FL-Group II hydrogen gas detection equipment . 64
87 Annex B (normative) Acceptance criteria for Type O2 . 67
88 B.1 Type O2 equipment (Type O2-DE & Type O2-IN) . 67
89 Annex C (normative) Acceptance criteria for Type TX . 69
90 C.1 Type TX equipment (Type TX-SM & Type TX-HM) . 69
91 Annex D (normative) Acceptance criteria for open path gas detection equipment . 71
92 D.1 Open path gas detection equipment (Type FL-OP and TX-OP) . 71
93 Annex E (normative) Gas specific performance requirements . 73
94 Annex F (normative) Determination of time of response and time of recovery . 75
95 F.1 Calculation of response and recovery times . 75
96 F.2 Pressure, temperature and gas velocities. 76
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97 F.3 Diffusion equipment . 76
98 F.3.1 General .
99 F.3.2 Experimental arrangements .
100 F.3.3 Calibration mask method 1 . 76
101 F.3.4 Calibration mask method 2 . 77
102 F.3.5 Flow method . 78
103 F.3.6 Injection method . 79
104 F.4 Aspirated equipment . 79
105 F.4.1 Test rig . 79
106 F.4.2 Equipment without internal pump . 79
107 F.4.3 Equipment with internal pump . 80
108 F.5 Open path detection equipment (Types FL-OP and TX-OP) . 80
109 Annex G (informative) Considerations of time of response and time of recovery . 82
110 G.1 Underdamped responses . 82
111 Annex H (informative) Open path gas detection equipment water vapour test
112 apparatus . 87
113 H.1 Open path gas detection equipment water vapour test apparatus . 87
114 Bibliography . 88
116 Figure 1 – Relationship between indication range and measuring range . 14
117 Figure 2 – Warm-up time in clean air (typical) . 16
118 Figure 3 – Warm-up time in standard test gas (typical) . 16
119 Figure 4 – Example of functional components of gas detection equipment . 18
120 Figure 5 – Gas cell for calibration and speed of response test . 31
121 Figure F.1 – Monotonic characteristic of overdamped or critically damped time
122 response .
123 Figure F.2 – Underdamped time response .
124 Figure F.3 – Test chamber for Calibration mask method 1 . 77
125 Figure F.4 – Test arrangement for Calibration mask method 2 . 78
126 Figure F.5 – Schematic example of test chamber for flow method . 79
127 Figure F.6 – Schematic example of test rig for use with aspirated equipment . 80
128 Figure G.1 – Example of water vapour test apparatus . 87
130 Table 1 – Indicators . 19
131 Table 2 – Test samples and sequence of tests . 28
132 Table A.1 – Acceptance Criterion for Type FL-Group I Equipment . 59
133 Table A.2 – Acceptance Criterion for Type FL-Group II Equipment . 61
134 Table A.3 – Acceptance Criterion for Type FL-Group II Hydrogen Gas Detection
135 Equipment . 64
136 Table B.1 – Acceptance Criterion for Type O2 Equipment (Type O2-DE & Type O2-IN) . 67
137 Table C.1 – Acceptance Criterion for Type TX Equipment (Type TX-SM & Type TX-HM) . 69
138 Table D.1 – Acceptance Criterion for Open Path Gas Detection Equipment (Type FL-
139 OP & Type TX-OP) . 71
140 Table E.1 – Gas specific performance requirements . 73
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142 INTERNATIONAL ELECTROTECHNICAL COMMISSION
143 ____________
145 EXPLOSIVE ATMOSPHERES –
147 Part 29-0: Gas detection equipment –
148 General requirements and test methods
150 FOREWORD
151 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
152 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
153 co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
154 in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
155 Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
156 preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
157 may participate in this preparatory work. International, governmental and non-governmental organizations liaising
158 with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
159 Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
160 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
161 consensus of opinion on the relevant subjects since each technical committee has representation from all
162 interested IEC National Committees.
163 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
164 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
165 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
166 misinterpretation by any end user.
167 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
168 transparently to the maximum extent possible in their national and regional publications. Any divergence between
169 any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
170 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
171 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
172 services carried out by independent certification bodies.
173 6) All users should ensure that they have the latest edition of this publication.
174 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
175 members of its technical committees and IEC National Committees for any personal injury, property damage or
176 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
177 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
178 Publications.
179 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
180 indispensable for the correct application of this publication.
181 9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
182 patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
183 respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
184 may be required to implement this document. However, implementers are cautioned that this may not represent
185 the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
186 shall not be held responsible for identifying any or all such patent rights.
187 IEC 60079-29-0 has been prepared by the IEC technical committee 31: Equipment for explosive
188 atmospheres. It is an International Standard.
189 The text of this International Standard is based on the following documents:
Draft Report on voting
31/XX/FDIS 31/XX/RVD
191 Full information on the voting for its approval can be found in the report on voting indicated in
192 the above table.
193 The language used for the development of this International Standard is English.
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194 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
195 accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
196 at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
197 described in greater detail at www.iec.ch/publications.
198 Users of this document are advised that interpretation sheets clarifying the interpretation of this
199 document can be published. Interpretation sheets are available from the IEC webstore and can
200 be found in the "history" tab of the page for each document.
201 A list of all parts in the IEC 60079-29 series, published under the general title Explosive
202 atmospheres, can be found on the IEC website.
203 The committee has decided that the contents of this document will remain unchanged until the
204 stability date indicated on the IEC website under webstore.iec.ch in the data related to the
205 specific document. At this date, the document will be
206 • reconfirmed,
207 • withdrawn, or
208 • revised.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates that it
contains colours which are considered to be useful for the correct understanding of its
contents. Users should therefore print this document using a colour printer.
oSIST prEN IEC 60079-29-0:2025
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212 INTRODUCTION
213 This part of IEC 60079-29 specifies general requirements, test methods and acceptance criteria
214 that apply to flammable, oxygen and toxic gas detection equipment intended to detect gases
215 and vapours and to provide an indication, alarm or other output function for personnel or
216 property protection in industrial and commercial applications.
217 Although a wide range of conditions can be encountered in practice, this document specifies
218 requirements to be fulfilled by gas detection equipment when tested under prescribed laboratory
219 conditions.
220 General and performance requirements for Type HM gas detection equipment intended for
221 occupational exposure measurement in the region of Occupational Exposure Limit Values are
222 set out in IEC 62990-1.
223 Consideration needs to also be given to the following relevant international standards:
224 IEC 60079-29-2, Explosive atmospheres – Part 29-2: Gas detectors – Selection, installation,
225 use and maintenance of detectors for flammable gases and oxygen
226 IEC 62990-2, Workplace atmospheres – Part 2: Gas detectors – Selection, installation, use and
227 maintenance of detectors for toxic gases and vapours
228 IEC 60079-29-3, Explosive atmospheres – Part 29-3: Gas detectors – Guidance on functional
229 safety of fixed gas detection systems
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231 EXPLOSIVE ATMOSPHERES –
233 Part 29-0: Gas detection equipment –
234 General requirements and test methods
238 1 Scope
239 This part of IEC 60079-29 specifies general requirements, test methods and acceptance criteria
240 that apply to flammable, oxygen and toxic gas detection equipment intended to detect gases
241 and vapours and to provide an indication, alarm or other output function for personnel or
242 property protection in industrial and commercial applications.
243 NOTE 1 The term gas detection equipment is often referred to as the term gas detector.
244 NOTE 2 The terms 'gas' and 'gases' used in this document are also intended to include 'vapour' and 'vapours'.
245 This document applies to the following gas detection equipment:
246 • Gas detection equipment Type "FL" intended for the detection of flammable gases:
247 − Type FL-Group I, in mines susceptible to firedamp;
248 − Type FL-Group II, in locations other than mines susceptible to firedamp; and
249 − Type FL-OP, open path gas detection equipment for flammable gases.
250 • Gas detection equipment Type "O2" intended for the detection of Oxygen:
251 − Type O2-DE, detection of oxygen deficiency or oxygen enrichment; and
252 − Type O2-IN, inertisation as measuring function for explosion protection.
253 NOTE 3 Inertisation is an explosion protection technique where an explosive atmosphere is purged with inert gas.
254 • Gas detection equipment Type "TX" intended for the detection of toxic gases:
255 − Type TX-SM, detection in areas for safety monitoring applications and typically using
256 alarm signalling;
257 − Type TX-HM, occupational exposure measurement in the region of occupational
258 exposure limit values; and
259 NOTE 4 Type TX-HM gas detection equipment performance requirements reside in IEC 62990-1.
260 − Type TX-OP, open path gas detection equipment for toxic gases.
261 NOTE 5 This document addresses equipment giving a level of performance suitable for general purpose
262 applications. Specific applications might require particular tests or evaluations that are additional to and separate
263 from the compliance with this document.
264 NOTE 6 Although the focus of this standard is gas detection equipment for use in ‘explosive atmospheres’, this
265 standard can be applicable to detection in areas not formally classified as ‘explosive atmospheres’.
266 NOTE 7 Refrigerant gas detection equipment used for life, health and safety area monitoring are within the scope
267 of this standard or IEC 62990-1.
268 This document is not applicable to equipment:
269 – used for medical applications;
270 – used only in laboratories for analysis or measurement;
271 – used only for process monitoring or control purposes (such as a gas analyser);
272 – used in the domestic environment;
273 – used in environmental air pollution monitoring;
274 – used for flue gas analysis;
275 – used for sampling systems external to the gas detection equipment;
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276 – with samplers and concentrators such as sorbents or paper tape having an irreversible
277 indication;
278 – consisting of a passive optical receiver without a dedicated optical source.
279 – incorporated within appliances that use refrigerants.
280 2 Normative references
281 The following documents are referred to in the text in such a way that some or all of their content
282 constitutes requirements of this document. For dated references, only the edition cited applies.
283 For undated references, the latest edition of the referenced document (including any
284 amendments) applies.
285 IEC 62990-1, Workplace atmospheres – Part 1: Gas detectors – Performance requirements of
286 detectors for toxic gases
287 IEC 62990-2, Workplace atmospheres – Part 2: Gas detectors – Selection, installation, use and
288 maintenance of detectors for toxic gases and vapours
289 IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
290 IEC 60079-0, Explosive atmospheres – Part 0: Equipment – General requirements
291 IEC 60529, Degrees of protection provided by enclosures (IP Code)
292 IEC 61000-4-29, Electromagnetic compatibility (EMC) – Part 4-29: Testing and measurement
293 techniques – Voltage dips, short interruptions and voltage variations on d.c. input power port
294 immunity tests
295 IEC 61326-1, Electrical equipment for measurement, control and laboratory use – EMC
296 requirements – Part 1: General requirements
297 ISO/IEC 80079-20-1, Explosive atmospheres – Part 20-1: Material characteristics for gas and
298 vapour classification – Test methods and data
299 3 Terms and definitions
300 For the purposes of this document, the following terms and definitions apply.
301 ISO and IEC maintain terminology databases for use in standardization at the following
302 addresses:
303 • IEC Electropedia: available at https://www.electropedia.org/
304 • ISO Online browsing platform: available at https://www.iso.org/obp
305 3.1 Gas properties
306 3.1.1
307 ambient air
308
309 normal atmosphere surrounding the equipment
310 3.1.2
311 clean air
312
313 air that is free of gases or vapours to which the sensor is sensitive or which influence the
314 performance of the sensor
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315 3.1.3
316 reference air
317
318 air with an oxygen volume fraction of (21 ± 0,4) %
319 3.1.4
320 zero test gas
321
322 gas, that is free of the gas(es) to be measured and interfering and contaminating substances,
323 the purpose of which is calibration/adjustment of the equipment zero
324 3.1.5
325 standard test gas
326
327 test gas with a composition specified to be used for all tests unless otherwise stated
328 3.1.6
329 flammable gas
330
331 DEPRECATED: combustible gas
332 gas or vapour which, when mixed with air in a certain proportion, will form an explosive
333 atmosphere
334 Note 1 to entry: For the purposes of this part of IEC 60079-29, the term "flammable gas" includes flammable
335 vapours.
336 [SOURCE: IEC 60079-10-1:2020, 3.6.4, modified – "or vapour" dropped from term and one note
337 to entry added. Admitted and deprecated terms also added]
338 3.1.7
339 toxic gas
340
341 gas or vapour that can be harmful to human health and/or the performance of persons due to
342 its physical or physico-chemical properties
343 3.1.8
344 poisons
345
346 substances that lead to temporary or permanent change of
347 performance, particularly loss of sensitivity of the sensing element
348 3.1.9
349 volume fraction
350 V/V
351 quotient of the volume of a specified component and the sum of the volumes of all components
352 of a gas mixture before mixing
353 Note 1 to entry: The volume fraction and volume concentration take the same value if, at the same state conditions,
354 the sum of the component volumes before mixing and the volume of the mixture are equal. However, because the
355 mixing of two or more gases at the same state conditions is usually accompanied by a slight contraction or, less
356 frequently, a slight expansion, this is not generally the case.
357 Note 2 to entry: All volumes are with respect to the pressure and the temperature of the gas mixture .
358 3.2 Structure (or composition) of gas detection equipment
359 3.2.1
360 alarm-only equipment
361
362 equipment with an alarm but not having an indication of measured value
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363 3.2.2
364 aspirated equipment
365
366 equipment that samples the gas by drawing it to the gas sensor
367 Note 1 to entry: A hand operated or electric pump is often used to draw gas to the sensor.
368 3.2.3
369 automatically aspirated equipment
370
371 aspirated equipment with an integral pump or separate pump, which is connected directly to the
372 equipment
373 3.2.4
374 diffusion equipment
375
376 equipment in which the transfer of gas from the atmosphere to the sensor takes place without
377 aspirated flow
378 3.2.5
379 fixed equipment
380 equipment fastened to a support, or otherwise secured in a specific location when energized
381 [SOURCE: IEC 60079-0:2017, 3.31.2]
382 3.2.6
383 portable equipment
384
385 equipment intended to be carried by a person during its operation
386 Note 1 to entry: Portable equipment carried by a person during its operation is sometimes referred to as hand -held
387 equipment.
388 Note 2 to entry: Portable gas detection equipment, typically less than 1 kg, may be operated by only one hand.
389 Note 3 to entry: Larger equipment can be operated by the user while it is carried either by hand, by a shoulder strap
390 or carrying harness.
391 [SOURCE: IEC 60079-0:2017, 3.31.4, modified – addition of Note 2 and 3 to entry]
392 3.2.7
393 transportable equipment
394 equipment not intended to be carried by a person during operation, nor intended for fixed
395 installation
396 [SOURCE: IEC 60079-0:2017, 3.31.5]
397 3.2.8
398 gas detection transmitter
399 fixed gas detection equipment that provides a conditioned electronic signal or output indication
400 to a generally accepted industry standard (such as 4 to 20 mA), intended to be utilized with
401 separate gas detection control units or signal processing data acquisition, central monitoring
402 and similar systems, which typically process information from various locations and sources
403 including, but not limited to gas detection equipment
404 3.2.9
405 gas detection control unit
406 equipment intended to provide display indication, alarm functions, output contacts or alarm
407 signal outputs or any combination when operated with remote sensor(s)
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408 3.2.10
409 separate gas detection control unit
410 equipment intended to provide display indication, alarm functions, output contacts or alarm
411 signal outputs or any combination when operated with gas detection transmitter(s)
412 3.2.11
413 equipment with integral sensor(s)
414
415 equipment that provides display indication, alarm functions, output contacts or alarm signal
416 outputs using a sensor which is within or directly assembled to the equipment housing
417 3.2.12
418 accessory
419
420 component which can be fitted to the equipment for a special purpose and that is referenced in
421 the instructions
422 EXAMPLE: External gas pump, sampling probe, hoses, collecting cone, weather protection device .
423 3.3 Sensors
424 3.3.1
425 sensing element
426
427 part of the sensor that is sensitive to the gas or vapour to be measured
428 3.3.2
429 measuring principle
430
431 principle that makes the sensing element or the sensor sensitive to the gas or vapour to be
432 measured
433 3.3.3
434 sensor
435
436 assembly in which the sensing element is housed and that may also contain associated circuit
437 components
438 3.3.4
439 integral sensor
440
441 sensor that is within or directly assembled to a gas detection control unit, gas detection
442 transmitter, or to transportable or portable equipment
443 3.3.5
444 remote sensor
445
446 sensor that is installed separately, but is connected to a gas detection control unit, gas detection
447 transmitter, or to transportable or portable equipment
448 3.4 Supply of gas to equipment
449 3.4.1
450 sample line
451
452 means by which the gas being sampled is conveyed to the sensor
453 Note 1 to entry: Accessories such as filters or water traps are often included in the sample line.
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454 3.4.2
455 sampling probe
456
457 separate accessory sample line that is optionally attached to the equipment
458 3.4.3
459 adjustment
460
461 procedure carried out to minimize the deviation of the indication from the test gas concentration
462 Note 1 to entry: When the equipment is adjusted to give an indication of zero in zero test gas, the procedure is
463 called 'zero adjustment'.
464 3.4.4
465 calibration
466
467 procedure that establishes the relationship between an indication and the concentration of a
468 test gas
469 3.4.5
470 calibration kit
471
472 means of presenting test gas to the equipment for the purpose of calibrating, adjusting or
473 verifying the operation of the equipment
474 Note 1 to entry: The calibration kit can be used for verifying the operation of the alarms if the concentration of the
475 test gas is beyond the alarm set-point.
476 Note 2 to entry: A mask for calibration and test is an example of a field calibration kit.
477 3.4.6
478 mask for calibration and test
479
480 device that can be attached to the equipment to present a test gas to the sensor in a
481 reproducible manner
482 3.5 Signals and alarms
483 3.5.1
484 measured value
485
486 calculated concentration of gas or vapour that results from processing the sensor signal
487 Note 1 to entry: The measured value can be further processed before indication on output or display (for example,
488 filtering, averaging, suppression of indication).
489 3.5.2
490 indication
491
492 representation of the measured value on an output or display
493 3.5.3
494 indication range
495
496 range of indications over which the equipment is capable of indicating
497 SEE Figure 1.
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498 3.5.4
499 lower limit of indication
500
501 smallest indication within the indication range
502 SEE Figure 1.
503 3.5.5
504 upper limit of indication
505
506 largest indication within the indication range
507 SEE Figure 1.
508 3.5.6
509 measuring range
510
511 range of indications of gas concentration over which the accuracy of the equipment lies within
512 specified limits
513 SEE Figure 1.
514 3.5.7
515 lower limit of measurement
516
517 smallest measured value within the measuring range
518 SEE Figure 1.
519 Note 1 to entry: Lower limit of measuring range can be zero.
520 3.5.8
521 upper limit of measurement
522
523 largest measured value within the measuring range
524 SEE Figure 1.
525 Note 1 to entry: Indications below the lower limit of measurement or above the upper limit of measurement will not
526 necessarily meet the requirements of this document.
527 Note 2 to entry: Depending upon the gas detection technology employed, the limits might exactly align.
529 Figure 1 – Relationship between indication range and measuring range
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530 3.5.9
531 alarm set point
532
533 setting of the equipment at which the measured concentration will cause the equipment to
534 initiate an indication, alarm or other output function
535 3.5.10
536 latching alarm
537
538 alarm that, once activated, requires deliberate action to be deactivated
539 3.5.11
540 fault signal
541
542 audible, visible or other type of output, different from the alarm signal, permitting, directly or
543 indirectly, a warning or indication that the equipment is not working satisfactorily
544 3.5.12
545 special state
546
547 state of the equipment other than that in which the intent is monitoring of gas concentration
548 and, if the equipment provides alarms, alarming
549 Note 1 to entry: Special state includes warm-up, calibration mode and fault condition.
550 3.5.13
551 inhibition signal, direct or indirect
552
553 audible, visual, or other type of output which provides a warning or indication that normal
554 operation has been suspended
555 3.6 Times
556 3.6.1
557 drift
558
559 variation in the equipment indication over time at any fixed gas volume fraction (including clean
560 air) under constant ambient conditions
561 3.6.2
562 final indication
563
564 indication given by the equipment after stabilization
565 3.6.3
566 time of response/recovery
567 t(x)
568
569 time interval, with the equipment in a warmed-up condition, between the time when an
570 instantaneous concentration change between two test gases is produced at the equipment
...
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