Nederlandse norm. NEN-EN-IEC (en)

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1 Dit document mag slechts op een stand-alone PC worden geinstalleerd. Gebruik op een netwerk is alleen. toestaan als een aanvullende licentieovereenkomst voor netwerkgebruik met NEN is afgesloten. This document may only be used on a stand-alone PC. Use in a network is only permitted when a supplementary license agreement for us in a network with NEN has been concluded. Nederlandse norm NEN-EN-IEC (en) Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen (IEC :2015,IDT) Explosieve atmosferen - Deel 29-2: Gas detectoren - Selectie, installatie, gebruik en onderhoud van detectoren van brandbare gassen en zuurstof (IEC :2015,IDT) Vervangt NEN-EN-IEC :2007; NEN-EN-IEC :2007/C11:2008 ICS mei 2015

2 NEN-EN-IEC Als Nederlandse norm is aanvaard: - EN :2015,IDT - IEC :2015,IDT Nederlands Elektrotechnisch Comité Normcommissie "Elektrisch materieel ivm explosiegevaar (NEC 31)" THIS PUBLICATION IS COPYRIGHT PROTECTED DEZE PUBLICATIE IS AUTEURSRECHTELIJK BESCHERMD Apart from exceptions provided by the law, nothing from this publication may be duplicated and/or published by means of photocopy, microfilm, storage in computer files or otherwise, which also applies to full or partial processing, without the written consent of the Netherlands Standardization Institute. The Netherlands Standardization Institute shall, with the exclusion of any other beneficiary, collect payments owed by third parties for duplication and/or act in and out of law, where this authority is not transferred or falls by right to the Reproduction Rights Foundation. Auteursrecht voorbehouden. Behoudens uitzondering door de wet gesteld mag zonder schriftelijke toestemming van het Nederlands Normalisatie-instituut niets uit deze uitgave worden verveelvoudigd en/of openbaar gemaakt door middel van fotokopie, microfilm, opslag in computerbestanden of anderszins, hetgeen ook van toepassing is op gehele of gedeeltelijke bewerking. Het Nederlands Normalisatie-instituut is met uitsluiting van ieder ander gerechtigd de door derden verschuldigde vergoedingen voor verveelvoudiging te innen en/of daartoe in en buiten rechte op te treden, voor zover deze bevoegdheid niet is overgedragen c.q. rechtens toekomt aan de Stichting Reprorecht. Although the utmost care has been taken with this publication, errors and omissions cannot be entirely excluded. The Netherlands Standardization Institute and/or the members of the committees therefore accept no liability, not even for direct or indirect damage, occurring due to or in relation with the application of publications issued by the Netherlands Standardization Institute. Hoewel bij deze uitgave de uiterste zorg is nagestreefd, kunnen fouten en onvolledigheden niet geheel worden uitgesloten. Het Nederlands Normalisatie-instituut en/of de leden van de commissies aanvaarden derhalve geen enkele aansprakelijkheid, ook niet voor directe of indirecte schade, ontstaan door of verband houdend met toepassing van door het Nederlands Normalisatie-instituut gepubliceerde uitgaven Nederlands Normalisatie-instituut Postbus 5059, 2600 GB Delft Telefoon (015) , Fax (015)

3 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM NEN-EN-IEC :2015 EN May 2015 ICS Supersedes EN :2007 English Version Explosive atmospheres - Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen (IEC :2015) Atmosphères explosives - Partie 29-2: Détecteurs de gaz - Sélection, installation, utilisation et maintenance des détecteurs de gaz inflammables et d'oxygène (IEC :2015) Explosionsfähige Atmosphäre - Teil 29-2: Gasmessgeräte - Auswahl, Installation, Einsatz und Wartung von Geräten für die Messung von brennbaren Gasen und Sauerstoff (IEC :2015) This European Standard was approved by CENELEC on 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 CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN :2015 E

4 EN : Foreword The text of document 31/1169/FDIS, future edition 2 of IEC , prepared by IEC TC 31, Equipment for explosive atmospheres, was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN :2015. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement latest date by which the national standards conflicting with the document have to be withdrawn (dop) (dow) This document supersedes EN :2007. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC :2015 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN IEC NOTE Harmonized as EN

5 - 3 - EN :2015 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: Publication Year Title EN/HD Year IEC Explosive atmospheres -- Part 0: Equipment EN General requirements - - +A11 - IEC Explosive atmospheres -- Part 10-1: EN Classification of areas - Explosive gas atmospheres IEC Explosive atmospheres -- Part 10-2: EN Classification of areas - Combustible dust atmospheres IEC Explosive atmospheres -- Part 13: Equipment protection by pressurized room "p" EN IEC Explosive atmospheres -- Part 17: Electrical EN installations inspection and maintenance IEC Explosive atmospheres -- Part 19: EN Equipment repair, overhaul and reclamation IEC Explosive atmospheres -- Part 29-1: Gas EN (mod) detectors - Performance requirements of detectors for flammable gases IEC Explosive atmospheres -- Part 29-4: Gas EN detectors - Performance requirements of open path detectors for flammable gases IEC Industrial-process control - Safety of analyzer houses EN

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7 NEN-EN-IEC :2015 IEC Edition INTERNATIONAL STANDARD or Vo be iew ev Pr Explosive atmospheres Part 29-2: Gas detectors Selection, installation, use and maintenance of detectors for flammable gases and oxygen IEC : (en) eld

8 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, 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 enquiry about obtaining additional rights to this publication, please contact the address below or your local IEC member National Committee for further information. IEC Central Office Tel.: , rue de Varembé Fax: CH-1211 Geneva 20 Switzerland About the IEC The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes International Standards for all electrical, electronic and related technologies. About IEC publications The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the latest edition, a corrigenda or an amendment might have been published. IEC Catalogue - webstore.iec.ch/catalogue The stand-alone application for consulting the entire bibliographical information on IEC International Standards, Technical Specifications, Technical Reports and other documents. Available for PC, Mac OS, Android Tablets and ipad. IEC publications search - The advanced search enables to find IEC publications by a variety of criteria (reference number, text, technical committee, ). It also gives information on projects, replaced and withdrawn publications. IEC Just Published - webstore.iec.ch/justpublished Stay up to date on all new IEC publications. Just Published details all new publications released. Available online and also once a month by . Electropedia - The world's leading online dictionary of electronic and electrical terms containing more than terms and definitions in English and French, with equivalent terms in 15 additional languages. Also known as the International Electrotechnical Vocabulary (IEV) online. IEC Glossary - std.iec.ch/glossary More than electrotechnical terminology entries in English and French extracted from the Terms and Definitions clause of IEC publications issued since Some entries have been collected from earlier publications of IEC TC 37, 77, 86 and CISPR. 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: csc@iec.ch.

9 INTERNATIONAL STANDARD IEC Edition Explosive atmospheres Part 29-2: Gas detectors Selection, installation, use and maintenance of detectors for flammable gases and oxygen INTERNATIONAL ELECTROTECHNICAL COMMISSION ICS ISBN Warning! Make sure that you obtained this publication from an authorized distributor. Registered trademark of the International Electrotechnical Commission

10 2 IEC :2015 IEC 2015 CONTENTS FOREWORD... 8 INTRODUCTION Scope Normative references Terms and definitions Gas properties and other physics Types of equipment Sensors and detectors Supply of gas to instruments Signals and alarms Times, checks and equipment behaviour Terms exclusive to open path equipment Basic information on the properties, behaviour, gases and vapours, and specific applications of gas detection Detecting gases and vapours General Safety when monitoring for flammable gases where personnel could be present Some common properties of gases and vapours The differences between detecting gases and vapours General Detection of gases Detection of vapours Oxygen deficiency General Chemical reaction of oxygen, with solid products Chemical reaction of oxygen, with gaseous products Dilution of the air by displacement by some other gas or vapour Specific applications of gas detection Gas detection as means of reducing risk of explosion Gas free work permit Monitoring of air inlets Specific considerations for open path detection Measuring principles General Catalytic sensors General Common applications Limitations Interferences Poisoning Thermal conductivity sensors General Common applications Limitations Interferences... 41

11 IEC :2015 IEC Poisoning Infrared sensors General Common applications Limitations Interferences Poisoning Semiconductor sensors General Common applications Limitations Interferences Poisoning Electrochemical sensors General Common applications Limitations Interferences Poisoning Flame ionization detectors (FID) General Common applications Limitations Interferences Poisoning Flame temperature analysers (FTA) General Common applications Limitations Interferences Poisoning Photo ionisation detector (PID) General Common applications Limitations Interferences Poisoning Paramagnetic oxygen detector General Common applications Limitations Interference Poisoning Selection of equipment General Selection criteria General criteria Gases to be detected by the equipment Application of fixed equipment... 50

12 4 IEC :2015 IEC Application of transportable and portable equipment Miscellaneous factors affecting selection of equipment Electromagnetic immunity Intended Zone(s) of use Behaviour of gas releases Nature of a release General Release rate of gas or vapour Flammable limits Ventilation Relative density of the released gas or vapour Temperature and/or pressure Other parameters to be considered Outdoor sites and open structures Buildings and enclosures General Unventilated buildings and enclosures Ventilated buildings and enclosures Environmental considerations Design and installation of fixed gas detection systems General Basic considerations for the installation of fixed systems General Point detection equipment and remote sensors Systems consisting of sampling equipment Open path (line of sight) equipment Location of detection points General General site considerations Environmental conditions Access for calibration and maintenance Additional considerations for sample lines Additional considerations for open path equipment Summary of considerations for the location of measuring points and open paths Installation of measuring point and open path equipment Integrity and safety of fixed systems General Redundancy in fixed systems Protection against loss of main power supply Timing of installation during construction operations Commissioning Inspection Initial gas calibration Adjustment of alarm set points Operating instructions, plans and records Use of portable and transportable flammable gas detection equipment General... 70

13 IEC :2015 IEC Initial and periodic check procedures for portable and transportable instrumentation General Inspection and functional checks Routine tests and recalibration Maintenance and recalibration Guidance on the use of portable and transportable equipment Electrical safety in hazardous atmospheres Safety of personnel Spot tests and sampling Sampling above liquids Avoidance of condensation Poisoning of sensors Changes of temperature Accidental damage Minimalist operation, the Read and run concept Training of operational personnel General General training Basic limitations and safety Operator training Maintenance training Maintenance, routine procedures and general administrative control General Operational checks General Fixed systems Portable and transportable gas detection equipment Maintenance General Fixed equipment Portable and transportable gas detection equipment Off-site maintenance, general Maintenance procedures Sensors General Flame arrestor Flow systems General Inspection Filters, traps and flame arrestors Flow system and sample chamber Flow connections Moving parts Automatic sample-draw systems Loss-of-flow signals Readout devices General Other readouts Alarms... 84

14 6 IEC :2015 IEC Calibration Calibration kits and test equipment Calibration procedure Annex A (normative) Measuring principles A.1 General A.2 Catalytic sensors A.2.1 General A.2.2 Common applications A.2.3 Limitations A.2.4 Interferences A.2.5 Poisoning A.3 Thermal conductivity sensors A.3.1 General A.3.2 Common applications A.3.3 Limitations A.3.4 Interferences A.3.5 Poisoning A.4 Infrared sensors A.4.1 General A.4.2 Common applications A.4.3 Limitations A.4.4 Interferences A.4.5 Poisoning A.5 Semi-conductor sensors A.5.1 General A.5.2 Common applications A.5.3 Limitations A.5.4 Interferences A.5.5 Poisoning A.6 Electrochemical sensors A.6.1 General A.6.2 Common applications A.6.3 Limitations A.6.4 Interferences A.6.5 Poisoning A.7 Flame ionization detectors (FID) A.7.1 General A.7.2 Common applications A.7.3 Limitations A.7.4 Interferences A.7.5 Poisoning A.8 Flame temperature analysers (FTA) A.8.1 General A.8.2 Common applications A.8.3 Limitations A.8.4 Interferences A.8.5 Poisoning A.9 Photo ionisation detector (PID) A.9.1 General

15 IEC :2015 IEC A.9.2 Common applications A.9.3 Limitations A.9.4 Interferences A.9.5 Poisoning A.10 Paramagnetic oxygen detector A.10.1 General A.10.2 Common applications A.10.3 Limitations A.10.4 Interference A.10.5 Poisoning Annex B (informative) Environmental parameters Annex C (informative) Typical environmental and application check-list for flammable gas detectors (for both Group I and Group II equipment) Annex D (informative) Typical instrument maintenance record for flammable gas detectors Annex E (informative) Atmospheric visibility Bibliography Figure 1 Integral concentration over the path length Figure 2 Average concentration over the path length Table 1 Typical Tasks and Most Relevant Causes Table 2 Overview of gas detection equipment with different measuring principles Table A.1 Overview of gas detection equipment with different measuring principles Table B.1 Environmental parameters

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