爆炸性环境.第28部分:用光辐射保护设备和传输系统

[中文适用范围]： 本标准规定了用于爆炸性气体环境的设备使用光学辐射时的潜在点燃危险...它还涵盖位于外部但其光学辐射进入此类环境的设备...描述了在爆炸性气体环境中使用光学辐射传输设备时应采取的预防措施和要求...还概述了一种测试方法，用于验证在选定测试条件下光束是否不具备点燃能力，如果无法通过评估或光束强度测量保证光学限值。 本标准适用于波长范围从380 nm到10 μm的光学辐射...涵盖以下点燃机制： - 光学辐射被表面或颗粒吸收，导致其加热，在某些情况下可能使其达到点燃周围爆炸性环境的温度。 - 在特殊情况下，强光束焦点处气体直接激光诱导击穿，产生等离子体和冲击波，两者最终作为点燃源。 本标准不涉及紫外辐射和辐射在爆炸性混合物本身中的吸收引起的点燃。爆炸性吸收剂或含有自身氧化剂的吸收剂以及催化吸收剂也不在本标准范围内。 本标准规定了用于大气条件下的设备的要求...补充并修改了IEC 60079-0的一般要求。当本标准的要求与IEC 60079-0的要求冲突时，以本标准的要求为准。 本标准适用于光纤设备和光学设备，包括LED和激光设备，但不包括以下设备： 1) 非阵列发散LED 2) 所有灯具（固定、便携或可移动）、手灯和帽灯 3) 符合IEC 60825-1 Class 1限值的光学辐射源 4) 不属于光纤设备的单根或多根光缆 5) 完全包含光学辐射并符合适当保护类型的封闭设备。 [外文原描述]： IEC 60079-28:2015 RLV contains both the official IEC International Standard and its Redline version. The Redline version is available in English only and provides you with a quick and easy way to compare all the changes between the official IEC Standard and its previous edition. 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.