标准摘要
[中文适用范围]： 本部分IEC 60079提供了气体和蒸气分类的指导。它描述了一种测试方法，用于在正常温度和压力条件下测量气体或蒸气与空气混合物的最大实验安全间隙（MESG），以便选择合适的设备组。该方法不考虑障碍物对安全间隙的可能影响。本标准还描述了一种测试方法，用于测定纯蒸气或气体在大气压下空气中的自燃温度。提供的物质化学和工程特性的表格数据旨在帮助工程师在危险区域选择设备。希望随着各国测试结果的可获得性，不时发布更多数据。这些数据的选择特别参考了在危险区域使用设备的情况，并考虑了标准测量方法。 注1：本标准中的数据取自参考文献，参考文献列于参考文献中。 注2：比较参考文献时，数据可能会出现一些差异，但通常差异足够小，在选择设备时无关紧要。 [外文原描述]： IEC 60079-20-1:2010 provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the maximum experimental safe gaps (MESG) for gas- or vapour-air mixtures under normal conditions of temperature and pressure so as to permit the selection of an appropriate group of equipment. The tabulated values of chemical and engineering properties of substances are provided to assist engineers in their selection of equipment to be used in hazardous areas. This first edition of IEC 60079-20-1 cancels and replaces the first edition of IEC 60079-1-1(2002), the second edition of IEC 60079-4 (1975), its amendment 1(1995) and its complement: IEC 60079-4A (1970), the first edition of IEC/TR 60079-12 (1978) and the first edition of IEC 60079-20 (1996). It constitutes a technical revision. The contents of the corrigendum of July 2012 have been included in this copy.
英文名称Explosive atmospheres - Part 20-1: Material characteristics for gas and vapour classification - Test methods and data