防爆标志Ex-marking：Ex d ⅡC;DIP A20;Ex e Ⅱ Gb Exd II C Ex tD A21（BAT56-BA□□） Ex e ⅡGb;DIP A20;Ex II 2GD Exe II Ex tD A21（BAT56-BB□□） 

外壳材质：碳钢、黄铜、黄铜镀镍、不锈钢

Enclosure: Carbon steel, brass, brass with nickel-plated, or stainless steel