IEC IEC 60079-29-0 Edition 1.0 2025-11 INTERNATIONAL STANDARD Explosiveatmospheres- Part 29-0: Gas detection equipment - General requirements and test methods IEC 60079-29-0:2025-11(en) ICS 29.260.20 ISBN 978-2-8327-0860-6 THIS PUBLICATIONIS COPYRIGHT PROTECTED Copyright@2025IEC,Geneva,Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC copyright or have an enguiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Secretariat Tel.: +41 22 919 02 11 3, rue de Varembe [email protected] CH-1211 Geneva 20 www.iec.ch Switzerland About the IEC International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC.Please make sure that you have the latest edition, a corrigendum or an amendment might have been published. IECpublications search- IECProducts &ServicesPortal-products.iec.ch webstore.iec.ch/advsearchform Discover our powerful search engine and read freely all the The advanced search enables to find IEC publications by a publications previews, graphical symbols and the glossary. variety of criteria (reference number, text, technical Witha subscription you wili always have access to up to date committee, ...).. It also gives. information on projects, content tailored to your needs. replaced and withdrawn publications. Electropedia-www.electropedia.org IECJustPublished-webstore.iec.ch/justpublished The world's leading online dictionary on electrotechnology. Stay up to date on all new IEC publications. Just Published containing more than 22 500 terminological entries in English details all new publications released. Available online and and French, with equivalentterms in 25 additional languages. once a month by email. Also known as the international Electrotechnical Vocabulary (IEV) online. IEC Customer Service Centre -webstore.iec.ch/csc If you wish to give us your feedback on this publication or need further assistance, please contact the Customer Service Centre:[email protected]. Warning!Makesurethatyouobtainedthispublicationfromanauthorizeddistributor. IEC60079-29-0:2025IEC2025 CONTENTS FOREWORD. 4 INTRODUCTION 6 Scope. 1 2 Normative references.. 8 3 Terms and definitions.. 3.1 Gas properties. 3.2 Structure (or composition)ofgasdetection equipment. 9 3.3 11 3.4 Supply of gas to equipment.. 3.5 Signals and alarms .. 12 3.6 Times... .14 3.7 TypeOP open path gas detection equipment and fixed point infrared detectors.. 15 4 General requirements.. 4.1 Overview. .16 4.2 Design.. 17 4.2.1 General.. .17 4.2.2 Indicatorsandmeansofindication 17 4.2.3 Alarm signal(s) 4.2.4 Fault signals. .20 4.2.5 Special state indication 20 4.2.6 Adjustments ... .21 4.2.7 Battery-powered equipment .21 4.2.8 Software-controlled equipment 4.3 Marking .. 4.4 Instructions. ..23 5 Test methods. .26 5.1 General ... .26 5.2 General requirements for tests. .26 5.2.1 Samples and sequence of tests.. .26 5.2.2 Preparation of equipment before testing (all Types excluding FL-OP and TX-OP). 28 5.2.3 Preparation of equipment before testing (Types FL-OP and TX-OP)... 5.3 Normal conditions for test. .31 5.3.1 General.. 31 5.3.2 Test gas(es) .31 5.3.3 Flow rate for test gases, .33 5.3.4 Power supply.. .33 5.3.5 Temperature.. 33 5.3.6 Pressure.. 5.3.7 Humidity .... 5.3.8 Acclimation time. 5.3.9 ..34 Orientation. 5.3.10 Communications options. ..34 5.4 Tests. .34 5.4.1 General .34 5.4.2 Unpowered storage ..35 1 IEC60079-29-0:2025IEC2025 .35 5.4.3 Vibration 5.4.4 Drop test. .37 5.4.5 Calibration kit . .37 5.4.6 Linearity..... 5.4.7 Alarm set-point(s)..