Ex

It indicates the equipment is explosion-proof equipment

ds

It indicates the explosion protection type. For example, type"d" stands for Flameproof protection. Type "s" stands for Special protection. Type "e" stands for Increased Safety protection

IIB

It indicates the gas groups of hazardous atmosphere during the operation of equipment. There is "IIA","IIC"as well

T4

It indicates the temperature classes of hazardous atmosphere during the operation of equipment. The maximum Surface Temperature is 135℃. T1, T2, T3, T5, T6 represents the corresponding temperature classes respectively

Gb

It indicates a higher level of protection type for the equipment, normally operated in Zone 1 area. "GA" represents the highest level of protection type, normally operated in Zone 0 area. "Gc"represents low level of protection type, normally operated in Zone 2 area