EN 60079-29-4:2010

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 General requirements
5 Test requirements
6 Field verification equipment
7 Information for use
Annex A (informative) - Water vapour test apparatus
Bibliography
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications
Annex ZY (informative) - Significant changes between this
         European Standard and EN 50241-1:1999 and
         EN 50241-2:1999
Annex ZZ (informative) - Coverage of Essential Requirements
         of EC Directives

IEC 60079-29-4:2009 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 meter to a few kilometres. Such equipment measures the integral concentration of the absorbing gas over the optical path in units such as LFL.meter for flammable gases. This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard shall take precedence.