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In the paperwork is described a system for testing of pressurized type of protection for enclosures. In the first part of the paper was presented the explosion risk and pressurization of enclosures as type of protection. Also, in this part were underlined some requirements and advantages for this type of protection. In the second part was proposed and presented the theoretical model for measuring the protective gas concentration and also was mentioned the influence of air moisture. Consequently, were presented the...