... operating post,corrosion-proof post,post.Application Can be used Zone 1 and Zone 2 dangerous places. ... Can be used in IIA,IIB,IIC group explosive ... capacity,and long life has several functions to be selected freely.Explosion-proofing button by ultrasonic encapsulationarts ... of stainless steel and of anti-lost type,which be convenient ly to maintenance.The joint of shell ...