0℃(special order(-60～+80℃))2.Relative humidity:95%(when 25℃)3.The outdoor type can be used in the places without inflammable/explosive and corrosive medium;area for coal mine,and Bt4,which is applicable to the environment with A,B grade T1～T4 explosive gas mixture, can be used in the factory.(For details refer to GB3836.1)4.Degree of protection: the outdoor type and explosion-proof type is IP55,IP65,IP675.Working time:10 minutes for short time(special order can reach to 15-60 minutes)6.Refe