BS EN 60079-28-2007 爆炸性环境.光辐射设备和传输系统的保护

标准号：BS EN 60079-28-2007
中文标准名称：爆炸性环境.光辐射设备和传输系统的保护
英文标准名称：Explosive atmospheres - Protection of equipment and transmission systems using optical radiation
标准类型：K35
发布日期：2007/5/31 12:00:00
实施日期：2007/5/31 12:00:00
中国标准分类号：K35
国际标准分类号：29.260.20
引用标准：IEC 60079;IEC 60079-0;IEC 60079-10;IEC 60079-11;IEC 60825-2;IEC 61508;IEC 61511
适用范围：This part of IEC 60079 explains the potential ignition hazard from equipment using opticalradiation intended for use in explosive gas atmospheres. It also covers equipment, whichitself is located outside but its emitted optical radiation enters such atmospheres. It describesprecautions and requirements to be taken when using optical radiation transmitting equipmentin explosive gas atmospheres. It also outlines a test method, which can be used to verify abeam is not ignition capable under selected test conditions, if the optical limit values cannotbe guaranteed by assessment or beam strength measurement.This standard contains requirements for optical radiation in the wavelength range from380 nm to 10 μm. It covers the following ignition mechanisms:optical radiation is absorbed by surfaces or particles, causing them to heat up and, undercertain circumstances, this may allow them to attain a temperature which will ignite asurrounding explosive atmosphere;direct laser induced breakdown of the gas at the focus of a strong beam, producingplasma and a shock wave both eventually acting as the ignition source. These processescan 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 radiationin the explosive mixture itself. Explosive absorbers or absorbers that contain their ownoxidizer as well as catalytic absorbers are also outside the scope of this standard.This standard specifies requirements for equipment intended for use under atmosphericconditions.This standard supplements and modifies the general requirements of IEC 60079-0. Where arequirement of this standard conflicts with a requirement of IEC 60079-0, the requirement ofthis standard willll take precedence.