标准摘要
[中文适用范围]： ISO 17089 的这一部分规定了超声波燃气表 (USM) 的要求和建议，超声波燃气表利用声波信号测量封闭管道中气相的流量。 ISO 17089 的这一部分适用于传输时间 USM，重点关注工业流量测量。 其中包括由仪表主体组成的仪表以及带有现场安装传感器的仪表。 仪表的尺寸没有限制。 几乎可以适用于任何类型气体的测量；例如但不限于空气、碳氢化合物气体和蒸汽。 ISO 17089 的这一部分规定了用于气体流量测量的 USM 的性能、校准（需要时）和输出特性，并涉及安装条件。 注：可能存在比 ISO 17089 本部分中的规定更严格的国家或其他法规。 [外文原描述]： This part of ISO 17089 specifies requirements and recommendations for ultrasonic gas meters (USMs), which utilize acoustic signals to measure the flow in the gaseous phase in closed conduits. This part of ISO 17089 is applicable to transit time USMs and is focused towards industrial flow measurement. Included are meters comprising meter bodies as well as meters with field-mounted transducers. There are no limits on the size of the meter. It can be applied to the measurement of almost any type of gas; such as but not limited to air, hydrocarbon gases, and steam. This part of ISO 17089 specifies performance, calibration (when required), and output characteristics of USMs for gas flow measurement and deals with installation conditions. NOTE It is possible that national or other regulations apply which can be more stringent than those in this part of ISO 17089.
英文名称Measurement of fluid flow in closed conduits - Ultrasonic meters for gas — Part 2: Meters for industrial applications