1、 AMERICAN NATIONAL STANDARD ANSI/ISA-60079-29-2 (12.13.02)-2012 Explosive Atmospheres Part 29-2: Gas detectors Selection, installation, use and maintenance of detectors for flammable gases and oxygen Approved 27 June 2012 ANSI/ISA-60079-29-2 (12.13.02)-2012, Explosive Atmospheres Part 29-2: Gas dete
2、ctors Selection, installation, use and maintenance of detectors for flammable gases and oxygen ISBN: 978-1-937560-53-9 Copyright 2012 by IEC and ISA. All rights reserved. Not for resale. Printed in the United States of America. No part of this publication may be reproduced, stored in a retrieval sys
3、tem, or transmitted in any form or by any means (electronic mechanical, photocopying, recording, or otherwise), without the prior written permission of the Publisher. ISA 67 Alexander Drive P.O. Box 12277 Research Triangle Park, North Carolina 27709 - 3 - ANSI/ISA-60079-29-2 (12.13.02)-2012 Preface
4、This preface, as well as all footnotes and annexes, is included for information purposes and is not part of ANSI/ISA-60079-29-2 (12.13.02)-2012. This document has been prepared as part of the service of ISA toward a goal of uniformity in the field of instrumentation. To be of real value, this docume
5、nt should not be static but should be subject to periodic review. Toward this end, the Society welcomes all comments and criticisms and asks that they be addressed to the Secretary, Standards and Practices Board; ISA; 67 Alexander Drive; P. O. Box 12277; Research Triangle Park, NC 27709; Telephone (
6、919) 549-8411; Fax (919) 549-8288; E-mail: standardsisa.org. The ISA Standards and Practices Department is aware of the growing need for attention to the metric system of units in general, and the International System of Units (SI) in particular, in the preparation of instrumentation standards. The
7、Department is further aware of the benefits to USA users of ISA standards of incorporating suitable references to the SI (and the metric system) in their business and professional dealings with other countries. Toward this end, this Department will endeavor to introduce SI-acceptable metric units in
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16、IALS, OPERATIONS OR EQUIPMENT. THE DOCUMENT CANNOT ANTICIPATE ALL POSSIBLE APPLICATIONS OR ADDRESS ALL POSSIBLE SAFETY ISSUES ASSOCIATED WITH USE IN HAZARDOUS CONDITIONS. THE USER OF THIS DOCUMENT MUST EXERCISE SOUND PROFESSIONAL JUDGMENT CONCERNING ITS USE AND APPLICABILITY UNDER THE USERS PARTICUL
17、AR CIRCUMSTANCES. THE USER MUST ALSO CONSIDER THE APPLICABILITY OF ANY GOVERNMENTAL REGULATORY LIMITATIONS AND ESTABLISHED SAFETY AND HEALTH PRACTICES BEFORE IMPLEMENTING THIS DOCUMENT. THE USER OF THIS DOCUMENT SHOULD BE AWARE THAT THIS DOCUMENT MAY BE IMPACTED BY ELECTRONIC SECURITY ISSUES. THE CO
18、MMITTEE HAS NOT YET ADDRESSED THE POTENTIAL ISSUES IN THIS VERSION. The following people served as members of ISA Subcommittee ISA12.13: NAME COMPANY J. Miller, Chair Detector Electronics Corporation R. Seitz, Co-Chair Artech Engineering M. Coppler, Managing Director Det Norske Veritas DNV S. Baliga
19、 General Monitors W. Bennett Mine Safety Appliances Company J. Berthold Senscient Inc. S. Bihler Zone Safe Solutions, Inc. S. Bruce Delphian Corporation T. Crawford Intertek Testing Services D. El Tawy Solar Turbines, Inc. I. Gilstrap GE Energy K. Hedrick MSHA Approval and Certification Center S. He
20、nney FM Approvals R. Masek CSA International D. Mills UL LLC L. Owen Dooley Tackaberry Inc. M. Phadke Lanxess India Private Limited R. Poling Armstrong World Industries P. Sallaway Consultant M. Schaeffer Control Instruments Corporation A. Skinner GMI Gas Measurement Instruments LLC M. Spencer Colum
21、bia Gas Transmission J. Stratman Honeywell Analytics Inc. A. Vial Shell Exploration b) transportable apparatus; and c) portable apparatus. ANSI/ISA-60079-29-2 (12.13.02)-2012 - 16 - This standard is not intended to cover, but may provide useful information, for the following: a) apparatus intended o
22、nly for the detection of non-flammable toxic gases; b) apparatus of laboratory or scientific type intended only for analysis or measurement purposes; c) apparatus intended for underground mining applications (group I apparatus); d) apparatus intended only for process control applications; e) apparat
23、us intended for applications in explosives processing and manufacture; f) apparatus intended for the detection of a potentially flammable atmosphere resulting from dust or mist in air; g) open path apparatus not used for point measurement. 2 Normative rReferences The following referenced documents a
24、re indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60050-426, International Electrotechnical Vocabulary (IEV) Chapter 426: Electrica
25、l apparatus for explosive atmospheres IEC 60079-0: Electrical apparatus for explosive gas atmospheres Part 0: General requirements ANSI/ISA-60079-0 (12.00.01), Explosive atmospheres - Part 0: Equipment - General Requirements ISA-TR12.24.01 (IEC 60079-10) IEC 60079-10: Electrical apparatus for explos
26、ive gas atmospheres Part 10: Classification of hazardous areas ANSI/NFPA 70, National Electrical Code IEC 60079-20, Electrical apparatus for explosive gas atmospheres Part 20: Data for flammable gases and vapours, relating to the use of electrical apparatus ANSI/NFPA 497, Recommended practice for th
27、e classification of flammable liquids, gases, or vapors and of hazardous (classified) locations for electrical installations in chemical process areas IEC ISA-60079-29-1, Explosive atmosphere Part 29-1: Gas detectors Performance requirements ANSI/ISA-12.13.04, Performance Requirements for Open Path
28、Combustible Gas Detectors ANSI/ISA-92.04.01, Performance Requirements for Instruments Used to Detect Oxygen- Deficient/Oxygen-Enriched Atmospheres 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60050(426) and IEC ANSI/ISA-60079-0, as well as the fol
29、lowing apply. Also, since this is intended as a stand-alone standard, certain definitions within IEC ISA-60079-29-1 are repeated below for the convenience of the reader. - 17 - ANSI/ISA-60079-29-2 (12.13.02)-2012 3.1alarm setpoint fixed or adjustable setting of the apparatus that is intended to pre-
30、set the level of concentration at which the apparatus will automatically initiate an indication, alarm or other output function 3.2ambient air the normal atmosphere surrounding the apparatus 3.3aspirated apparatus apparatus that samples the gas by drawing it to the gas sensor for example by means of
31、 a hand-operated or electric pump 3.4catalytic sensor sensor, the operation of which depends upon the oxidation of gases on an electrically heated catalytic element 3.5clean air air that is free of flammable gases and interfering or contaminating substances 3.6concentration the amount of the gas or
32、vapour of interest in a specified amount of the background gas or air, expressed in suitable units NOTE Typical units include volume fraction (v/v) (see 3.57); molar (moles per mole m/m); percentage of the LFL of a particular substance; parts per million by volume (ppm); parts per billion by volume
33、(ppb). 3.7continuous duty apparatus gas detecting apparatus that is powered for long periods of time, but may have either continuous or intermittent sensing 3.8continuous or quasi-continuous sensing mode of operation in which power is applied continuously to the sensing element and readings are take
34、n continuously or at regular and frequent intervals 3.9diffusion apparatus apparatus in which the transfer of gas from the atmosphere to the gas sensor takes place by random molecular movement, i.e. under conditions in which there is no aspirated flow 3.10dose the total amount of substance absorbed
35、or trapped, proportional to the concentration and the duration of exposure 3.11drift variation in the apparatus indication with time at any fixed gas volume fraction concentration (including clean air) under constant ambient conditions ANSI/ISA-60079-29-2 (12.13.02)-2012 - 18 - 3.12electrochemical s
36、ensor sensor, the operation of which depends upon changes of the electrical parameters of electrodes placed in an electrolyte due to redox reactions of the gas on the surface of the electrodes 3.13explosion protected apparatus apparatus incorporating a type of protection covered by the IEC ISA-60079
37、 series of standards 3.14explosive gas atmosphere mixture with air, under normal atmospheric conditions, of flammable substances in the form of gas or vapour, in which, after ignition, permits self-sustaining flame propagation NOTE 1 This definition specifically excludes dusts and fibres in suspensi
38、on in air. Mists are not covered by this standard. NOTE 2 Although a mixture that has a concentration above the upper flammable limit (see 3.54) is not an explosive atmosphere, in certain cases for area classification purposes, it is advisable to consider it as an explosive gas atmosphere. NOTE 3 No
39、rmal atmospheric conditions include variations above and below reference levels of 101,3 kPa and 20 C provided the variations have a negligible effect on the explosive properties of the flammable materials. 3.15explosive range range of gas or vapour mixtures with air, with concentrations between the
40、 lower and upper explosive (flammable) limits 3.16field check with gas (response check) application of test gas to the sensor to check the response signal or the generation of an alarm, without adjustments of zero, sensitivity, or alarm level 3.17firedamp flammable gas, consisting mainly of methane,
41、 found naturally in mines 3.18fixed apparatus apparatus that is intended to have all its parts permanently installed 3.19flame ionisation detector FID sensor, the operation of which depends upon the ionization of the gas being detected in a hydrogen flame 3.20flame temperature analyser FTA sensor, t
42、he operation of which depends upon the change of temperature of a flame by the gas being detected 3.21flammable gas gas or vapour which, when mixed with air in a certain proportion, will form an explosive atmosphere NOTE For the purposes of this standard, the term “flammable gas“ includes flammable
43、vapours. - 19 - ANSI/ISA-60079-29-2 (12.13.02)-2012 3.22flashpoint lowest liquid temperature at which, under certain standardized conditions, a liquid gives off vapours in a quantity such as to be capable of forming an ignitable vapour/air mixture 3.23group II apparatus electrical apparatus for inst
44、allation in areas classified in accordance with Articles 500 and 505 of the NEC electrical apparatus for places with a potentially explosive atmosphere, other than mines susceptible to firedamp 3.24infrared absorption sensor sensor, the operation of which depends upon the absorption of infrared radi
45、ation by the gas being detected 3.25initial calibration the first calibration for a specific substance, measuring range and application carried out by the manufacturer before delivery, or on site, before starting the operation 3.26intermittent sensing mode of operation in which the power or flow to
46、the sensor is applied intermittently according to a predetermined cycle and readings taken at the predetermined cycle 3.27lower flammable limit LFL volume fraction of flammable gas or vapour in air below which an explosive gas atmosphere does not form, expressed as a percentage (see IEC 60079-20 ANS
47、I/NFPA 497) NOTE This is also known as lower explosive limit (LEL). 3.28open path infrared sensor sensor capable of detecting gas at any location along an open path traversed by an infrared beam 3.29paramagnetic oxygen detector sensor, the operation of which depends upon the magnetic properties of o
48、xygen the gas being detected 3.30photo ionisation detector PID sensor, the operation of which is based on the ionisation of gaseous compounds by ultraviolet (UV) radiation 3.31poisons (of sensors) substances which lead to temporary or permanent loss of sensitivity of the sensors ANSI/ISA-60079-29-2
49、(12.13.02)-2012 - 20 - 3.32portable apparatus spot reading or continuous duty apparatus that has been designed to be readily carried from place to place and to be used while it is being carried. A portable apparatus is battery powered and includes, but is not limited to a) a hand-held apparatus, typically less than 1 kg, which requires use of only one hand to operate; b) personal monitors, similar in size and mass to the hand-held apparatus, that are continuously operating (but not necessarily continuously sensing) while they are attached to the user; and c) lar
