In the process of purchasing explosion-proof camera, many customers often encounter such problems, that is, explosion-proof camera, some are explosion-proof type, some are intrinsically safe, some are mine, and some are used, then how To distinguish and choose the explosion-proof camera product? For this question, let me give you a detailed introduction:
During the use of explosion-proof camera, some are often in the underground coal mine with gas, coal dust and other explosive atmospheres, namely Class I explosion-proof equipment, and some are used for dust, flammable and explosive gases, steam or misty combustible materials (such as: Class II explosion-proof equipment is used in industrial environments with a high proportion of CH4, C2H2, C2H4, NH3, CO, etc. The factory explosion-proof monitoring products are Class II non-gas body explosion-proof monitoring products and non-coal dust explosion-proof monitoring products. These products must be certified by explosion-proof authorities to be applicable to hazardous gas environment Zone 1 and Zone 2 hazardous sites; IIA, IIB, IIC Class 20, 21, and 22 areas of explosive gas environment and flammable dust environment; applicable to the environment with temperature group T1—T6, except for the explosion-proof certificate issued by the inspection agency authorized by the National Safety Production Office. It is also required to obtain the safety certification of the National Safety Mark Center, which is the so-called coal safety certificate and mine safety certificate. If you use a non-certified explosion-proof camera, 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.
The following signs are generally found on the outer casing of explosion-proof products, the specific meanings are as follows:
1Ex----National Explosion-proof Electrical Products Quality Supervision and Inspection Center (CQST) Certification Mark
d----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 through any joint surface and hole 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 equipment.
Explosion-proof (Ex d) technology is to install electrical components with a casing. The electrical components become high-temperature and high-pressure gas generated after the explosion caused by the ignition source, and are decompressed and decompressed to the outside through the gap of the outer casing (explosion-proof gap). The temperature-decompressed gas is not enough to cause an explosion of the outside of the casing. Therefore, the explosion-proof means that the energy of the explosion is isolated inside the cavity, instead of isolating the dangerous gas outside the cavity, and the sealing is to isolate the external explosion. gas.
In ia/ib technology is generally applied to the instrument. By limiting the energy in the electrical circuit and matching the structural design of the electrical equipment, it is impossible to generate the point at which the ignition source is required in the circuit under normal and accidental conditions. Intrinsically safe technology is generally used in sets. To set up the safety barrier in the safety zone, the circuit behind the safety barrier is intrinsically safe. The intrinsically safe circuit card\terminal\cable\plastic Golan must be marked with light blue. .
2 Electrical equipment that does not cause ignition of the surrounding explosive atmosphere under the specified conditions is divided into two categories:
I——Electrical equipment for coal mines and underground mines
II - Electrical equipment for the factory
3 National and Standardization Center MA, KA logo
MA-coal safety certificate
KA-minean certificate
Shenzhen Qiangmei Intelligent Technology Co., Ltd. specializes in providing explosion-proof camera, explosion-proof camera, explosion-proof camera and other explosion-proof video surveillance system equipment.
