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Australian Ex Standards for Gas Detection in Explosive Atmospheres

DESIGN OF EQUIPMENT
AS/NZS 60079.29.1:2008 : 
Explosive atmospheres - Gas detectors - Performance requirements of detectors for flammable gases
Specifies general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed apparatus for the detection and measurement of flammable gas or vapour concentrations with air. The apparatus, or parts thereof, are intended for use in potentially explosive atmospheres and in mines susceptible to firedamp.
INSTALLATION
AS/NZS 60079.29.2:2008 : 
Explosive atmospheres - Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen
Specifies general requirements for construction, testing and performance, and describes the test methods that apply to portable, transportable and fixed apparatus for the detection and measurement of flammable gas or vapour concentrations with air. The apparatus, or parts thereof, are intended for use in potentially explosive atmospheres and in mines susceptible to firedamp.
HAZARDOUS AREA CLASSIFICATION
AS/NZS 60079.10:2009 : 
Electrical apparatus for explosive gas atmospheres - Classification of hazardous areas (IEC 60079-10:2002 MOD)
Specifies the classification of hazardous areas where flammable gas or vapour risks may arise, in order to permit the proper selection and installation of apparatus for use in such hazardous areas.
OTHER
AS/NZS 60079.20:2012 : 
Electrical apparatus for explosive gas atmospheres - Material Characteristics for Gas and Vapour Classification - Test Methods and Data - Classification of Gases and Vapours.

This part of IEC 60079 provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the maximum experimental safe gaps (MESG) for gas- or vapour-air mixtures under normal conditions of temperature1 and pressure so as to permit the selection of an appropriate group of equipment. The method does not take into account the possible effects of obstacles on the safe gaps. This standard describes also a test method intended for use in the determination of the auto-ignition temperature of a chemically pure vapour or gas in air at atmospheric pressure. The tabulated values of chemical and engineering properties of substances are provided to assist engineers in their selection of equipment to be used in hazardous areas