Today, let's break them down. Once you understand them, you'll never be misled~

First, Class II means non - mine gas explosion - proof, which is the fundamental premise. Ex is the symbol for explosion - proof. Next is the explosion - protection type, such as Exd (flameproof type), Exe (increased safety type), etc., but the specific marking shall prevail. Then comes the gas group and temperature group. EPL is the equipment protection level, all of which are key parameters to judge the explosion - proof performance.

However, not all Class II explosion - proof marks are the same. For example, some explosion - proof certificates are marked with "IIB + H2" but without the temperature group, which needs your attention. In addition, there are the explosion - protection types of associated equipment, such as intrinsically safe safety barriers in brackets, and non - electrical explosion - proof equipment, all of which fall into the category of Class II explosion - proof marks.

For more information about explosion - proof marks, please feel free to contact STS!