27 September 2005 Protection concepts from optical radiation used in places of danger from explosion of gases, vapour or cloud of particles
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Abstract
Use of optical systems in hazardous locations can result in ignition of surrounding explosive atmosphere. The conducted research work allowed to propose three protection concepts. The primary protection concept - inherently safe optical radiation - consists in use of optical radiation with power, energy or irradiance incapable of causing ignition of surrounding explosive atmosphere. However, the arbitrary determination of values of these parameters is considered as excessively rigorous. The work presents the proposed protection concepts in relation to zone classification. The author describes his own method to determine safe values based on probability mathematics that can be used not only to derive these values, but also to compare different measurement procedures and, as well, different tests set-up.
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Ryszard Kopka, "Protection concepts from optical radiation used in places of danger from explosion of gases, vapour or cloud of particles", Proc. SPIE 5952, Optical Fibers: Applications, 595216 (27 September 2005); doi: 10.1117/12.622487; https://doi.org/10.1117/12.622487
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