Electrical Apparatus for the Detection and Measurement of Flammable Gases - Part 6: Guide for the Selection@ Installation@ Use and Maintenance of Apparatus for the Detection and Measurement of Flammable Gases (Edition 1.0)
This part of IEC 61779 gives guidance on the selection@ installation@ use and maintenance of electrically operated group II apparatus for the detection and measurement of flammable gases complying with the requirements of IEC 61779-1 to IEC 61779-5. It is a compilation of practical knowledge to assist the user@ and applies to apparatus@ instruments and systems that indicate the presence of a flammable or potentially explosive mixture of gas or vapour with air by using an electrical signal from a gas sensor to produce a meter reading@ to activate a visual or audible pre-set alarm or other device@ or any combination of these. NOTE ?C When in classified areas@ the apparatus should be so installed and used that it is not capable of itself igniting a combustible gas-air mixture. It should therefore comply with the requirements of IEC 60079-10. For the purpose of this standard@ flammable gases shall include flammable vapours. This standard applies only to group II apparatus intended for use in industrial and commercial safety applications@ involving areas classified in accordance with IEC 60079-10. For the purpose of this standard@ apparatus includes a) fixed apparatus; b) transportable apparatus; and c) portable apparatus. This standard is not intended to cover the following: a) apparatus intended only 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; d) apparatus intended for applications in explosives processing and manufacture; e) apparatus intended only for process control applications; f) apparatus intended for the detection of a potentially flammable atmosphere resulting from dust or mist in air.