The interpretation of the meaning of the explosion-proof certification mark mainly starts from the following key aspects:
1、 Explosion proof type
Common examples include explosion-proof type represented by "d", increased safety type represented by "e", and intrinsic safety type represented by "i".
Different explosion-proof types mean that different explosion-proof technology measures are adopted to prevent accidents from occurring. For example, explosion-proof type is achieved by encapsulating components that may generate sparks or high temperatures in a sturdy shell. In the event of an accident inside the shell, the shell can withstand pressure and prevent flames from spreading to the outside.
2、 Equipment category
Divided into Class I, Class II, and Class III.
Class I is mainly used in environments containing hazardous mixtures such as methane underground in coal mines.
Class II is applicable to flammable and explosive environments other than coal mines, such as common combustible gas and steam environments in industries such as petrochemicals and natural gas.
Class III is used in combustible dust environments, such as those present in flour mills, wood processing plants, and other places.
3、 Gas group
For Class II equipment, further subdivision is required based on the characteristics of flammable and explosive gases. For example, groups IIA, IIB, IIC, etc. There are differences in ignition energy and ignition limits among different groups of gases. For example, gases in the IIC group are usually more dangerous, with lower ignition energy and a wider limit range.
4、 Temperature group
Use letters to indicate the maximum allowable surface temperature range for the device. For example, T1 to T6, where T1 represents the devicezuiHigh surface temperature can reach 450 ℃, T6 representszuiThe high surface temperature shall not exceed 85 ℃. The higher the temperature group, the lower the allowed surface temperature, and the relatively higher the safety in hazardous environments. When selecting equipment, it is necessary to ensure that the temperature group of the equipment is suitable for the ignition temperature of flammable and explosive gases that may exist in the environment.
By comprehensively understanding this information, one can accurately determine the scope of application, explosion-proof performance, and safety level of an explosion-proof equipment, thereby ensuring its correct use and installation in hazardous environments.
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