灌溉用水表

[中文适用范围]： 本文件规定了水表的要求和认证程序，无论用于计量流经充满电的封闭管道的冷水或热水的实际体积的设计技术如何。 这些水表装有指示总体积的装置。 它适用于用于灌溉用途的水表（以下简称水表），无论用于此目的的水质如何。 本文件还适用于基于电气或电子原理的水表以及基于机械原理的水表，其中包含用于计量冷水实际体积流量的电子装置。 它规定了受计量控制的电子辅助设备的计量要求。 注：清洁水表与灌溉水表不同。 本文件基于清洁水表标准，但制定灌溉水表的具体标准以表明其具体要求非常重要。 [外文原描述]： This document specifies the requirements and certification procedures for water meters, irrespective of the design technologies used to meter the actual volume of cold water or heated water flowing through a fully charged closed conduit. These water meters incorporate devices, which indicate the integrated volume. It applies to water meters intended for irrigation use (herein after referred to as water meters), regardless of the water quality used for this purpose. This document also applies to water meters based on electrical or electronic principles and to water meters based on mechanical principles, incorporating electronic devices used to meter the actual volume flow of cold water. It provides metrological requirements for electronic ancillary devices when they are subject to metrological control. NOTE Clean water meters are different from irrigation water meters. This document is based on clean water meters standards but, it is important to develop a specific standard for irrigation water meters indicating their specific requirements.