标准摘要
[中文适用范围]： 为ISO/IEC 80079的一部分，本部分提供了关于气体和蒸气分类的指导。它描述了一种测试方法，用于在常温常压（20 °C，101,3 kPa）下测量气体-空气混合物或蒸气-空气混合物的最大实验安全间隙（MESG），以便选择适当的设备组。本文件还描述了另一种测试方法，用于确定蒸气-空气混合物或气体-空气混合物在大气压下的自燃温度（AIT），以便选择适当的设备温度类别。 [外文原描述]： ISO/IEC 80079-20-1: 2017 is published as a dual log standard and 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-air mixtures or vapour-air mixtures under normal conditions of temperature and pressure (20 °C, 101,3 kPa) so as to permit the selection of an appropriate group of equipment. This document also describes a test method intended for use in the determination of the auto-ignition temperature (AIT) of a vapour-air mixture or gas-air mixture at atmospheric pressure, so as to permit the selection of an appropriate temperature class of equipment. Values of chemical properties of materials are provided to assist in the selection of equipment to be used in hazardous areas. Further data may be added as the results of validated tests become available. The materials and the characteristics included in a table (see Annex B) have been selected with particular reference to the use of equipment in hazardous areas. The data in this document have been taken from a number of references which are given in the bibliography. These methods for determining the MESG or the AIT may also be used for gas-air-inert mixtures or vapour-air-inert mixtures. However, data on air-inert mixtures are not tabulated. Keywords: classification of gases and vapours, measurement of the maximum experimental safe gaps (MESG) The contents of the corrigendum of July 2018 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