適用范圍Application 1區、2區危場所. IIA、IIB、IIC類爆炸性氣體環境 Can be used Zone 1 and Zone 2 dangerous places. Can be used in IIA,IIB,IIC group explosive atmosphere. 型號含義Model implication 產品特點 Features 防爆標志:Exd II. 優質碳素鋼制成。 螺紋規格可根據用戶要求特制. 符合GB3836-2000,IEC60079 標準要求。 Ex-mark:Exd II. Made of good carbon-steel. The thread specification can be provided particularily by user. Suitable for GB3836-2000,IEC60079 standard request.