本欧洲标准规定了与气体计量表相关的气体体积电子转换装置的结构，性能，安全性和一致性的要求和试验，用于根据EN 437测量第一和第二族的燃料气体量。 本欧洲标准用于型式试验，详细的相关规定见附件A. 本欧洲标准仅处理三种转换: ï,¾转换仅作为温度的函数（称为T转换）; ²转换为压力和温度的函数，具有恒定的压缩因子（称为PT转换）; ¬,¾转换为压力，温度和压缩因子（称为PTZ转换）的函数。 ！本文档与集成在气表中的温度转换无关，仅表示转换后的音量。 EN 12405-2正在准备能量转换。 气体体积转换装置由计算器和温度传感器或计算器，温度传感器和本地安装的压力传感器组成。 对于本欧洲标准的应用，转换装置可以作为制造商的选择被认为是完整的仪器（类型1）或由分离器

This European Standard specifies the requirements and tests for the construction, performance, safety and conformity of gas volume electronic conversion devices associated to gas meters, used to measure volumes of fuel gases of the 1st and 2nd families according to EN 437. This European Standard is intended for type testing, the detailed relevant provisions of which are given in Annex A. Only three kinds of conversion are treated in this European Standard:  conversion as a function of temperature only (called T conversion);  conversion as a function of the pressure and of the temperature with constant compression factor (called PT conversion);  conversion as a function of the pressure, the temperature and taking into account the compression factor (called PTZ conversion). !This document is not relevant to temperature conversion integrated into gas meters which only indicate the converted volume." EN 12405-2 for energy conversion is in preparation. Gas-volume conversion devices consist of a calculator and a temperature transducer or a calculator, a temperature transducer and a pressure transducer locally installed. For application of this European Standard, a conversion device may be, as a choice of the manufacturer, considered as a complete instrument (Type 1) or made of separate elements (Type 2), according to the definitions given in 3.1.18.1 and 3.1.18.2. In this last case, the provisions concerning pressure transducers, temperature sensors and temperature transducers are given in Annexes B, C and D respectively. Any conversion device can provide an error curve correction for a gas meter. NOTE When rendering an account to an end user the readings from the conversion device can be used in conjunction with the readings from a gas meter conforming to EN 1359, EN 12480, or EN 12261, as appropriate, or to any other appropriate and relevant international or national standard for gas meters, without prejudice of national regulations.