What is an explosion-proof mobile phone?

Issuing time:2020-04-27 00:00
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1.Application scenarios of explosion-proof mobile phones

Explosionproof mobile phones are mobile phones that can be used in natural environments such as flammability, flammability and explosion, smoke and dust. Explosion-proof mobile phones are equipped with the Ex explosion-proof certification mark, which indicates that the product has been verified according to the National Explosionproof Testing Center, and can be used in the natural environment of special flammable gases, suitable for flammable and explosive places such as the petroleum industry, chemical plants, and natural gas.


2.Basic principles of explosion-proof mobile phones


In general, mobile phones are exposed to high-frequency radio waves, which can cause frequent spark discharges. Friction can cause frictional spark discharges, flames caused by ignition of machinery and equipment, and explosions of rechargeable batteries. Because flammable compounds are common in the manufacturing, production, processing, storage and transportation of coal, petroleum industry, chemical plants, textiles, grain and oil processing and other manufacturing industries, mobile phones generally become a strong source of safety accidents at such sites. , If an explosion accident occurs, the damage will be huge;


Explosion-proof mobile phones deal with the problem of open flames in many ways. The appearance design of explosion-proof mobile phones is not different from that of general mobile phones, but the raw materials and physical characteristics of the application are quite different from general models. Generally, V0 flame-retardant fireproof materials are used . Manufacturers use a variety of explosion-proof technologies, such as intrinsically safe power circuits, limiting the maximum ambient temperature of the enclosure, and selecting "dust-tight" or "anti-fouling" enclosures to limit the ingress of smoke and dust, to avoid the introduction of flammable compounds Igniting, urges the explosion-proof mobile phone to operate safely in the risky natural environment.


3.How to choose explosion-proof mobile phones


Companies need to know how to choose the right explosion-proof mobile phone for their company. When selecting an explosion-proof mobile phone, you must first make sure that there are several types of flammable chemicals in the natural environment, and then divide the risk site according to the different vapor or dust.


1 Combustible chemicals are divided into III categories:


Type I: coal mine methane gas; Type II: flammable vapor compounds (including steam and mist); Type III: flammable soot (chemical fiber or floating matter).


2 Definition of risk site


It is a measure of the specific risk probability of the area, and therefore requires the available flameproof type. Below is the classification of the risk areas delineated by the International Electrotechnical Commission / European Electrotechnical Commission.



Zone 0 (Zone0): flammable and explosive gas exists from beginning to end or longterm; areas where there are continuous risk factors for more than 1,000 hours per year;


Zone 1 (Zone1): The area where combustible gas will be generated or existed during the whole process of the legitimate work of the instrument panel; areas where there are risk factors 10 to 1000 hours per year;


Zone 2 (Zone2): Generally, there will be no flammable gas and even if it is sometimes generated, its storage time is very short; in the case of a safety accident, there are 0.1 ~ 10 hours per year for dangerous factors;


3 temperature class


It is the maximum ambient temperature of the electrical equipment related to the ignition temperature of the gas (assuming the operating temperature is 40 ° C). The ignition kinetic energy is irrelevant to the ignition temperature. All flammable vapors and their ratings are listed in the first part of BS5345.



Class Ⅰ: Electrical equipment for coal mines;


Class Ⅱ: all electrical appliances for natural environment of combustible gas except for mines and coal mines.


Ⅱ can be divided into ⅡA, ⅡB, and ⅡC. The equipment marked with ⅡB can be applied to the application standards of ⅡA machines and equipment; ⅡC can be applied to the application standards of ⅡA and ⅡB.


Class III: Combustible soot and natural environment electrical equipment other than media ore.


Type IIIA: flammable fluff; Type IIIB: non-conductive dust; Type IIIC: conductive dust.


Maximum ambient temperature: When the electrical equipment is working under the worst operating standard within the required range, it will cause the maximum temperature of all components of the electrical equipment that are ignited by the surrounding flammable natural environment. The maximum ambient temperature should be less than the flammable temperature.


For example: The ignition temperature of the flammable gas in the natural environment of the explosionproof controller is 100 ° C. In the most extreme working attitude of the controller, the maximum ambient temperature of all components of the controller should be less than 100 ° C.


Temperature class


Combustible natural environment electrical equipment is classified as T1-T6 according to its maximum ambient temperature



T1
T2
T3
T4
T5
T6
450 ℃
300 ℃
200℃
135 ℃
100 ℃
85℃


In summary, the company can choose an explosion-proof mobile phone that matches the explosion-proof level according to its own situation.

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