本标准描述了电磁式和超声波式饮用冷水表的两种性能等级，尺寸为1/2英寸。（13毫米）至20英寸。（500 mm），用于收入应用，以及制造过程中使用的材料和工艺。I型。该类型代表特别关注低流量精度的住宅和商业应用。第二类。这种类型代表了低流量不是主要问题的商业应用。本标准可在购买和接收尺寸为1/2英寸的电磁式和超声波式饮用冷水表的规范中参考。（13毫米）至20英寸。（500毫米），用于收入应用，可作为制造这些仪表的指南。本标准的规定适用于引用本文件的情况，且仅适用于饮用冷水- 用于收入应用的电磁式和超声波式水表。

This standard describes two performance classes of potable cold-water meters of the electromagnetic and ultrasonic type, in sizes 1/2 in. (13 mm) through 20 in. (500 mm), for revenue applications, and the materials and workmanship employed in their fabrication.Type I. This type represents residential and commercial applications where low flow accuracy is of particular concern.Type II. This type represents commercial applications where low flow is not of primary concern.This standard can be referenced in specifications for purchasing and receiving potable cold-water meters of the electromagnetic and ultrasonic type, in sizes 1/2 in. (13 mm) through 20 in. (500 mm), for revenue applications, and can be used as a guide for manufacturing these meters. The stipulations of this standard apply when this document has been referenced and then only to potable cold-water meters of the electromagnetic and ultrasonic type, for revenue applications.