Apply to the gas station, oil refinery, oil tank farm, spray paint room, paint room, chemical plants, petrochemical industry, ships, military, medicine, drilling platform,firecrackers production, dangerous goods warehouse, combustible gas workshop, the workshop of major hazard installation, food processing and storage, with theII A II B, II C class of combustible gas, ignition temperature classes T1 - T6 group 1 zone and 2 zone, combustible gas or vapor form explosive mixtures with air, can also be applied to ignition temperature classes T1 - T6 group of NO.*0, NO.*1, NO.*2 areas such as flammable and explosive place.