Recently, many customers have asked: Some gas detectors are explosion-proof, and some are intrinsically safe. What kind of explosion-proof type is it? What kind of intrinsic safety type?

Beijing Tiandi first and on this issue, for everyone to do a detailed introduction:

In the process of use, the combustible gas detection instrument is often in an industrial environment with a high proportion of dust, flammable and explosive gas, steam or misty combustible materials (such as CH4, C2H2, C2H4, NH3, CO, C2H5OH, etc.). in. This is because if you use the instrument without explosion-proof certification, it is easy to cause a short circuit or explosion accident due to water or dust entering the interior, which poses a hidden danger for safe production. At this point, you need to use an explosion-proof product.

The outer casing of the explosion-proof product generally has the following signs, the specific meanings are as follows:

1Ex----National Explosion-proof Electrical Products Quality Supervision and Inspection Center (CQST) Certification Mark

2d----Explosion-proof type: means that the instrument housing can withstand the internal explosion of the flammable mixture that has entered the inside of the casing without being damaged, and will not ignite by one or more of any joint faces and holes on the casing. An electrical equipment enclosure of an external explosive atmosphere formed by gas or steam.

Ia----Intrinsically safe type: refers to the circuit system, the electric sparks and thermal effects generated under normal working conditions or specified fault conditions can not ignite the specified explosive mixture of equipment.

3 Electrical equipment that does not cause ignition of the surrounding explosive environment under the specified conditions is divided into two categories:

I——Electrical equipment for coal mines and underground mines

II - Electrical equipment for the factory

4 Class II is classified into ABC Class III according to the maximum experimental safety clearance or minimum ignition current of explosive gas environment. The equipment of Class IIB can be applied to the conditions of use of IIA equipment; the equipment marked with IIC can be applied to the conditions of use of IIA and IIB.

5 maximum surface temperature T6: 85 ° C. According to the maximum surface temperature of the equipment, it is divided into six groups of T1 to T6, which refers to the highest temperature and maximum temperature reached by any component of the electrical equipment that may cause the surrounding explosive environment to ignite when the instrument equipment is working under the most unfavorable operating conditions within the specified range. Should be lower than the flammable temperature.

Temperature group auto-ignition temperature T (°C) Common explosive gas equipment allowable surface temperature (°C)

T1 T ≥ 450 hydrogen, acrylonitrile and other 46 kinds of 450

T2 450>T≥300 47 kinds of 300 such as acetylene and ethylene

T3 300>T≥200 Gasoline, crotonaldehyde and other 36 kinds of 200

T4 200>T≥135 6 kinds of 135 such as acetaldehyde and tetrafluoroethylene

T5 135>T≥100 carbon disulfide 100

T6 100>T≥85 ethyl nitrate and ethyl nitrite 85

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