爆炸性气体环境.第28部分:采用光辐射的设备和传输系统的保护

[中文适用范围]： IEC 60079 的这部分规定了用于在爆炸性环境中使用的发射光辐射设备的规范、测试和标记要求。它还涵盖位于爆炸性环境之外或由 IEC 60079-0 中列出的保护类型保护的设备，但其产生的光辐射旨在进入爆炸性环境。它涵盖 I 组、II 组和 III 组，以及 EPL Ga、Gb、Gc、Da、Db、Dc、Ma 和 Mb。本标准包含对 380 nm 至 10 µm 波长范围内光辐射的要求。它涵盖以下点火机制：光辐射被表面或颗粒吸收，导致其升温，在特定情况下可能使其达到足以点燃周围爆炸性环境的温度；在极少数特殊情况下，强光束焦点处直接由激光引起的气体击穿，产生等离子体和冲击波，两者最终作为点火源；这些过程可由断裂点附近的固体材料支持。 [外文原描述]： IEC 60079-28:2015 specifies the requirements, testing and marking of equipment emitting optical radiation intended for use in explosive atmospheres. It also covers equipment located outside the explosive atmosphere or protected by a Type of Protection listed in IEC 60079-0, but which generates optical radiation that is intended to enter an explosive atmosphere. It covers Groups I, II and III, and EPLs Ga, Gb, Gc, Da, Db, Dc, Ma and Mb. This standard does not cover ignition by ultraviolet radiation and by absorption of the radiation in the explosive mixture itself. Explosive absorbers or absorbers that contain their own oxidizer as well as catalytic absorbers are also outside the scope of this standard. This second edition cancels and replaces the first edition, published in 2006, and constitutes a technical revision. Refer to the Foreword of the document for a complete listing of the technical changes between edition 2.0 and previous edition of the document. Keywords: equipment emitting optical radiation intended for use in explosive atmospheres The Interpretation sheet 1 of November 2019 have been included in this copy.