BS EN 60079-28:2015规定了设备的要求、测试和标记 用于爆炸性环境的光辐射。它还包括位于 在爆炸性环境之外或受IEC 60079-0中列出的保护类型保护， 但它会产生光学辐射，目的是进入爆炸性环境。信息技术 涵盖第一组、第二组和第三组，以及EPLs Ga、Gb、Gc、Da、Db、Dc、Ma和Mb。本标准包含以下波长范围内的光辐射要求: 380 nm至10µm。它涵盖了以下点火机制:光学辐射被表面或颗粒吸收，导致其加热，并在 在某些情况下，这可能会使它们达到一个温度，从而点燃 周围有爆炸性环境。在罕见的特殊情况下，直接激光在强激光的焦点处导致气体击穿 产生等离子体和冲击波，两者最终都起到了点火源的作用。这些过程可以由接近击穿点的固体材料来支持。本标准不包括通过紫外线辐射和吸收辐射进行点火 在爆炸性混合物中。爆炸性吸收剂或含有自身爆炸性物质的吸收剂 氧化剂和催化吸收剂也不在本标准范围内。本标准规定了在大气环境下使用的设备的要求 条件本标准补充和修改了IEC 60079-0的一般要求。哪里 本标准的要求与IEC 60079-0的要求冲突 本标准优先。本标准适用于光纤设备和光学设备，包括LED和 激光设备，以下详述的设备除外:非阵列发散LED，用于显示设备状态或背光 作用所有灯具（固定式、便携式或移动式）、手电筒和顶灯；打算 由主电源（带或不带电流隔离）供电或由电池供电:带连续发散光源（适用于所有EPL），带LED光源（仅适用于EPL Gc或Dc）。 注2:EPL Gc或Dc以外的连续发散LED光源不排除在本标准之外 由于高辐照度潜在点火问题的不确定性，标准。符合以下要求的EPL Mb、Gb或Gc和Db或Dc应用的光辐射源 符合IEC 60825-1的1级限值。注3:参考的1级限值是指在一次测量时，排放限值低于15 mW的限值 根据IEC 60825-1，与光辐射源的距离，以及该测量距离 反映在Ex应用程序中。不属于光纤设备一部分的单根或多根光纤电缆，前提是:符合相关行业标准，以及其他保护措施， e、 g.坚固的布线、导管或电缆管道（适用于EPL Gb、Db、Mb、Gc或Dc），符合相关行业标准（适用于EPL Gc或Dc）。包含完全包含光辐射和辐射的外壳的封闭设备 符合相关EPL要求的适当类型的保护 符合下列条件之一的外壳:由于光辐射和 外壳内的吸收器是可接受的，例如防火“d”型外壳 （IEC 60079-1），用于保护爆炸性气体环境的外壳 提供，例如加压“p”外壳（IEC 60079- 2） ，呼吸受限“nR” 外壳（IEC 60079-15），或对进入爆炸性粉尘环境进行保护的外壳 提供，如防尘“t”型外壳（IEC 60079-31），或提供有关吸收器进入保护的外壳（如 IP 6X外壳），且不需要内部吸收器。注4:对于基于外壳结构的这些范围排除，预计外壳不会在爆炸性环境中打开，以保护进入。交叉引用:IEC 60050IEC 60079-0IEC 60079-1IEC 60079-11IEC 60079-15IEC 60825-2EN 60079-0EN 60079-1EN 60079-11EN 60079- 15EN 60825-2ANSI/ISA-TR12。21.01-2004IEC 60050-393IEC 60050-845IEC 60079-2IEC 60079-10-1IEC 60079-10-2IEC 60079-31IEC 61508IEC 60825-1IEC 61511IEC 60050-426IEC 60050-731EN 60079-2EN 60079-10-1EN 60079-31EN 61508EN 60825-1EN 61511购买本文件时可提供的所有现行修改件均包含在购买本文件中。

BS EN 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 contains requirements for optical radiation in the wavelength range from 380 nm to 10 µm. It covers the following ignition mechanisms:Optical radiation is absorbed by surfaces or particles, causing them to heat up, and under certain circumstances this may allow them to attain a temperature which will ignite a surrounding explosive atmosphere.In rare special cases, direct laser induced breakdown of the gas at the focus of a strong beam, producing plasma and a shock wave both eventually acting as ignition source. These processes can be supported by a solid material close to the breakdown point.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 standard specifies requirements for equipment intended for use under atmospheric conditions.This standard supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirement of this standard takes precedence.This standard applies to optical fibre equipment and optical equipment, including LED and laser equipment, with the exception of the equipment detailed below:Non-array divergent LEDs used for example to show equipment status or backlight function.All luminaires (fixed, portable or transportable), hand lights and caplights; intended to be supplied by mains (with or without galvanic isolation) or powered by batteries:with continuous divergent light sources (for all EPLs),with LED light sources (for EPL Gc or Dc only).NOTE 2 Continuous divergent LED light sources for other than EPL Gc or Dc are not excluded from the standard due to the uncertainty of potential ignition concerns regarding high irradiance.Optical radiation sources for EPL Mb, Gb or Gc and Db or Dc applications which comply with Class 1 limits in accordance with IEC 60825-1.NOTE 3 The referenced Class 1 limits are those that involve emission limits below 15 mW measured at a distance from the optical radiation source in accordance with IEC 60825-1, with this measured distance reflected in the Ex application.Single or multiple optical fibre cables not part of optical fibre equipment if the cables:comply with the relevant industrial standards, along with additional protective means, e.g. robust cabling, conduit or raceway (for EPL Gb, Db, Mb, Gc or Dc),comply with the relevant industrial standards (for EPL Gc or Dc).Enclosed equipment involving an enclosure that fully contains the optical radiation and that complies with a suitable type of protection as required by the involved EPL, with the enclosure complying with one of the following conditions:An enclosure for which an ignition due to optical radiation in combination with absorbers inside the enclosure would be acceptable such as flameproof "d" enclosures (IEC 60079-1), orAn enclosure for which protection regarding ingress of an explosive gas atmosphere is provided, such as pressurized "p" enclosures (IEC 60079-2), restricted breathing "nR" enclosure (IEC 60079-15), orAn enclosure for which protection regarding ingress of an explosive dust atmosphere is provided, such as dust protection "t" enclosures" (IEC 60079-31), orAn enclosure for which protection regarding ingress of absorbers is provided (such as IP 6X enclosures) and where no internal absorbers are to be expected.NOTE 4 For these scope exclusions based on enclosure constructions, it is anticipated that the enclosures are not opened in the explosive atmosphere, so that ingress is protected.Cross References:IEC 60050IEC 60079-0IEC 60079-1IEC 60079-11IEC 60079-15IEC 60825-2EN 60079-0EN 60079-1EN 60079-11EN 60079-15EN 60825-2ANSI/ISA-TR12.21.01-2004IEC 60050-393IEC 60050-845IEC 60079-2IEC 60079-10-1IEC 60079-10-2IEC 60079-31IEC 61508IEC 60825-1IEC 61511IEC 60050-426IEC 60050-731EN 60079-2EN 60079-10-1EN 60079-10-2EN 60079-31EN 61508EN 60825-1EN 61511All current amendments available at time of purchase are included with the purchase of this document.