本标准涵盖了位移计、涡轮流量计、科里奥利流量计和超声波流量计作为主仪表的使用。本标准中的要求适用于单相液态烃。其他液体的流量计验证要求应适用于整体监护转移精度，并应得到相关方的同意。本文件不包括用于校准校准仪的主仪表。有关校准仪主仪表校准的信息，请参见API MPMS第4.9.3章。

This standard covers the use of displacement, turbine, Coriolis, and ultrasonic meters as master meters.The requirements in this standard are intended for single-phase liquid hydrocarbons. Meter proving requirements for other fluids should be appropriate for the overall custody transfer accuracy and should be agreeable to the parties involved. This document does not cover master meters to be used for the calibration of provers. For information concerning master meter calibration of provers, see API MPMS Chapter 4.9.3.