1.1.1 This standard applies to non-dispersive infra-red analyzers used for the continuous determination of certain aspects of air quality by measuring gaseous constituents either in ambient or confined atmospheres or in gaseous streams entering the ambient air. 1.1.2 It applies to infra-red analyzers specified for installation either indoors or outdoors. 1.1.3 It applies to the complete analyzer as an integral analytical unit, including all optical, mechanical, electrical and electronic portions. For the purpose of this standard, any regulated power supply, provided with the analyzer or specified by the manufacturer, is considered part of the analyzer whether it is integral with the analyzer or housed separately. 1.1.4 It does not apply to the required sample handling systems or other accessories such as recorders, analogue-to-digital converters or data acquisition systems, used in conjunction with the analyzer. 1.1.5 Safety requirements are dealt with in IEC Publication 348, Safety Requirements for Electronic Measuring Apparatus. 1.1.6 This standard is in accordance with the general principles set out in IEC Publication 359, Expression of the Functional Performance of Electronic Measuring Equipment.