GB/T 3836.22-2017 Explosive atmospheres—Part 22:Protection of equipment and transmission system using optical radiation

Scope

This part of the "Explosive Environments" standard describes the potential ignition hazards of optical radiation equipment used in explosive gas environments, specifies preventive measures and requirements for optical radiation transmission equipment in explosive environments, and also prescribes a test method to verify that the light beam will not ignite under selected test conditions when optical limits cannot be guaranteed through assessment or beam intensity measurement. This part also applies to equipment located outside explosive environments but emitting optical radiation that can enter explosive environments. This part applies to optical radiation with a wavelength range of 380 nm to 10 μm. The ignition mechanism is as follows: -- After absorbing optical radiation, the surface or particles heat up and, under certain conditions, reach a temperature that ignites the surrounding explosive environment. -- Direct laser at the focal point of a strong beam causes gas decomposition, generating plasma and shock waves, which ultimately become ignition sources. Solid materials near the decomposition point can exacerbate this process.

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