1.1 GeneralThis International Standard specifies procedures and equipment that will permit, within certain limits, representative sampling for the automated determination of gas concentrations of effluent gas streams. The application is limited to the determination of oxygen (O2), carbon dioxide (CO2), carbon monoxide (CO), sulphur dioxide (SO2), nitrogen monoxide (NO) and nitrogen dioxide (NO2), or the sum of NO and NO2 as nitrogen oxides. Although they are only mentioned briefly in this International Standard, detailed velocity measurements (ISO 10780) are required when the mass flow rates of gases has to be determined.1.2 LimitationsIt is recognized that