本标准仅适用于超声波流量计 他们的行动基于声波的反射 波，通常被称为多普勒流量计。 流量测量使用频率或时间 领域技术。本标准涉及体积 液体主导流体的流量测量 稳定流或在一个时间段内随时间缓慢变化的流 完全填充的封闭管道。

This Standard applies only to ultrasonic flowmeters that base their operation on the reflection of acoustic waves, frequently referred to as a Doppler flowmeter. The flow measurement utilizes either frequency or time domain techniques. This Standard concerns the volume flow-rate measurement of a liquid dominant fluid with steady flow or flow varying only slowly with time in a completely filled closed conduit.