前言:这是CSA C900的第三版。1，热能表-第1部分:一般要求，采用了相同名称的CEN（欧洲标准化委员会）标准EN 1434-1（第3:2015版，合并修订件1:2018），但有加拿大的偏差。它取代了2013年作为CAN/CSA-C900发布的上一版本。1（采用EN 1434-1:2007），热量表-第1部分:一般要求。本标准是CSA集团采用的一组热能表标准之一，包括以下内容:a）CSA C900。1（采用EN 1434-1）-第1部分:一般要求；b） CSA C900。2（采用EN 1434-2）-第2部分:结构要求；c） CSA C900。3（采用EN 1434-3）-第3部分:数据交换和接口；d） CSA C900。4（采用EN 1434-4）-第4部分: 模式认可测试；e） CSA C900。5（采用EN 1434-5）-第5部分:初始验证试验；和f）CSA C900。6（采用EN 1434-6）-第6部分:安装、调试、运行监测和维护。本标准的制定符合加拿大标准委员会对加拿大国家标准的要求。CSA集团已将其作为加拿大国家标准发布。范围:本欧洲标准规定了热能表的一般要求。热能表是用于测量热交换回路中被称为热输送液体的液体吸收（冷却）或释放（加热）的能量的仪器。热能表以法定单位显示热量。本欧洲标准不包括电气安全要求。 本欧洲标准不包括压力安全要求。本欧洲标准不包括表面安装温度传感器。本标准仅适用于热负荷压差有限的封闭系统。

Preface:This is the third edition of CSA C900.1,Thermal energy meters — Part 1: General requirements, which is an adoption, with Canadian deviations, of the identically titled CEN (European Committee for Standardization) Standard EN 1434-1 (edition 3:2015 consolidated with Amendment 1:2018). It supersedes the previous edition, published in 2013 as CAN/CSA-C900.1 (adopted EN 1434-1:2007),Heat meters — Part 1: General requirements.This Standard is one of a group of Standards on Thermal energy meters being adopted by CSA Group, which consists of the following:a) CSA C900.1 (adopted EN 1434-1) —Part 1: General requirements;b) CSA C900.2 (adopted EN 1434-2) —Part 2: Constructional requirements;c) CSA C900.3 (adopted EN 1434-3) —Part 3: Data exchange and interfaces;d) CSA C900.4 (adopted EN 1434-4) —Part 4: Pattern approval tests;e) CSA C900.5 (adopted EN 1434-5) —Part 5: Initial verification tests; andf) CSA C900.6 (adopted EN 1434-6) —Part 6: Installation, commissioning, operational monitoring and maintenance.This Standard has been developed in compliance with Standards Council of Canada requirements for National Standards of Canada. It has been published as a National Standard of Canada by CSA Group.Scope:This European Standard specifies the general requirements for thermal energy meters. Thermal energy meters are instruments intended for measuring the energy which in a heat-exchange circuit is absorbed (cooling) or given up (heating) by a liquid called the heat-conveying liquid. The thermal energy meter indicates the quantity of heat in legal units.Electrical safety requirements are not covered by this European Standard.Pressure safety requirements are not covered by this European Standard.Surface mounted temperature sensors are not covered by this European Standard.This standard covers meters for closed systems only, where the differential pressure over the thermal load is limited.