1.1 这种做法 2. 包括允许代表性采样的程序和设备，以自动确定废气流的气体浓度，限制如下所述。该应用仅限于测定氧（O 2. )，二氧化碳（CO 2. )、一氧化碳（CO）、二氧化硫（SO 2. )，一氧化氮（NO），二氧化氮（NO 2. )和总氮氧化物（NO x ). 1.2 需要进行速度测量以确定气体的质量流率。这不包括在本实践中。 1.3 有些燃烧过程和条件可能会限制本规程的适用性。如果存在此类情况，则需要谨慎和有能力的技术判断，尤其是在处理以下任何情况时: 1.3.1 腐蚀性或高反应性部件， 1.3.2 高真空、高压或高温气流， 1.3.3 湿烟气， 1.3.4 由于过程中不可控制的变化导致的速度、温度或浓度波动， 1.3.5 由于气流不混合，气体分层， 1.3.6 使用环境控制装置进行测量，以及 1.3.7 气体浓度低。 1.4 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.5 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 有关更具体的安全预防措施，请参阅 5.1.4.8 , 5.2.1.6 和 6.2.2.1 . 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。

1.1 This practice 2 covers procedures and equipment that will permit representative sampling for the automated determination of gas concentrations of effluent gas streams with limitations as described below. The application is limited to the determination of oxygen (O 2 ), carbon dioxide (CO 2 ), carbon monoxide (CO), sulfur dioxide (SO 2 ), nitric oxide (NO), nitrogen dioxide (NO 2 ), and total oxides of nitrogen (NO x ). 1.2 Velocity measurements are required to determine the mass flow rates of gases. This is not included in this practice. 1.3 There are some combustion processes and conditions that may limit the applicability of this practice. Where such conditions exist, caution and competent technical judgment are required, especially when dealing with any of the following: 1.3.1 Corrosive or highly reactive components, 1.3.2 High vacuum, high pressure, or high temperature gas streams, 1.3.3 Wet flue gases, 1.3.4 Fluctuations in velocity, temperature, or concentration due to uncontrollable variation in the process, 1.3.5 Gas stratification due to the non-mixing of gas streams, 1.3.6 Measurements made using environmental control devices, and 1.3.7 Low levels of gas concentrations. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For more specific safety precautions, refer to 5.1.4.8 , 5.2.1.6 , and 6.2.2.1 . 1.6 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.