本标准确立了通用术语，并为测量和控制气体质量流量的毛细管热质量流量计和控制器的质量、说明、操作原理、选择、操作、安装和流量校准提供了指南。本标准的内容适用于纯气体和已知成分的气体混合物的单相流。

This Standard establishes common terminology and gives guidelines for the quality, description, principle of operation, selection, operation, installation, and flow calibration of capillary tube thermal mass flow meters and controllers for the measurement and control of the mass flow rate of gases. The content of this standard applies to single-phase flows of pure gases and gas mixtures of known composition.