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What does the explosion-proof symbol Ex de llB T6 Gb mean?

SINO Testing Services

| 2023-04-17|Return

Explosion proof signs are crucial information for equipment explosion-proof certification, involving the design requirements and testing items of the equipment. The explosion-proof mark can clearly understand the scope of application and site requirements of the equipment, and it can be said that the explosion-proof mark is the ID card of the explosion-proof product.

A complete explosion-proof sign includes:

Ex identification

Explosion proof type

Gas/dust combination

Temperature group

Equipment protection level


For example: Ex db ib IIC T4 Gb

Ex tb IIIC T130 ° C Db


Ex de llB T6 Gb

Ex represents explosion-proof

D e indicates that the equipment adopts explosion-proof and increased safety explosion-proof types

LlB indicates that the device is suitable for explosive gas environments of llB and llA

T6 indicates that the high surface temperature of the device does not exceed 85 ° C,

Gb is the protection level of the device, suitable for Zone 1 and Zone 2



To learn more, please contact Shenzhen Zhongnuo Testing Technology Co., Ltd.




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