CSA C22.2 NO. 60079-29-4:16 (R2021)

CSA Preface This is the first edition of CAN/CSA-C22.2 No. 60079-29-4, Explosive atmospheres — Part 29-4: Gas detectors — Performance requirements of open path detectors for flammable gases, which is an adoption, with Canadian deviations, of the identically titled IEC (International Electrotechnical Commission) Standard 60079-29-4 (first edition, 2009-11). It is one in a series of Standards issued by CSA Group under Part II of the Canadian Electrical Code. For brevity, this Standard will be referred to as \"CAN/CSA-C22.2 No. 60079-29-4\" throughout. This Standard is intended to be used in conjunction with CAN/CSA-C22.2 No. 60079-0, Explosive atmospheres — Part 0: Equipment — General requirements. This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group. Scope This part of IEC 60079-29 specifies performance requirements of equipment for the detection and measuring of flammable gases or vapours in ambient air by measuring the spectral absorption by the gases or vapours over extended optical paths, ranging typically from one metre to a few kilometres. Such equipment measures the integral concentration of the absorbing gas over the optical path in units such as LFL metre for flammable gases. NOTE 1 Actual values of concentration can be deduced only where it can be established that the concentration is uniform over the optical path, for example in very short optical paths (