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It is applicable to Zone 1 and Zone 2 of explosive gas environment; It is applicable to Zone 20, 21 and 22 of combustible dust environment; Suitable for IIA, ‖ B, ‖ C explosive gas environment; It is applicable to the environment of temperature group T1~T6; It is applicable to explosive dangerous places such as oil production and refining, storage, chemical industry, medicine, textile, printing and dyeing, military industry and military facilities.