ISO/TR 11583:2012描述了使用差压计测量湿气。它适用于气体和液体的两相流，其中流动的流体混合物由95%或更高体积分数的气体组成。ISO/TR 11583:2012是ISO 5167的延伸。给出了ISO/TR 11583:2012中方程式的气体和液体范围。这些方程式可能不适用于与测试结果有显著差异的液体，尤其是高粘度液体。 尽管ISO/TR 11583:2012中给出的超读方程适用于各种气体和液体，但适用于适当的气体温度- 除了单相流所需的信息外，液体密度比、气体流速的评估还取决于其他信息:压力损失的测量就足够了；可以使用示踪剂测量液体流量；总质量流率可能是已知的（湿蒸汽流量比天然气/液体流量更有可能）；在湿蒸汽流中，可以使用节流式热量计。 ISO/TR 11583:2012涵盖了使用文丘里管或孔板进行湿气测量。

ISO/TR 11583:2012 describes the measurement of wet gas with differential pressure meters. It applies to two-phase flows of gas and liquid in which the flowing fluid mixture consist of gas in the region of 95 % volume fraction or more. ISO/TR 11583:2012 is an extension of ISO 5167. The ranges of gases and liquids from which the equations in ISO/TR 11583:2012 were derived are given. It is possible that the equations do not apply to liquids significantly different from those tested, particularly to highly viscous liquids. Although the over-reading equations presented in ISO/TR 11583:2012 apply for a wide range of gases and liquids at appropriate gas-liquid density ratios, evaluating gas flow rates depends on information in addition to that required in single-phase flow: a measurement of the pressure loss can be sufficient; measurement of the liquid flow using tracers can be possible; the total mass flow rate may be known (this is more likely in a wet-steam flow than in a natural gas/liquid flow); in a wet-steam flow a throttling calorimeter can be used. Wet-gas measurement using Venturi tubes or orifice plates is covered in ISO/TR 11583:2012.