For many flammable and explosive places, fire prevention, electrical protection, and spark prevention are basic operations, so there will be corresponding requirements when choosing monitoring equipment.
As ordinary cameras increase in age and the surrounding environment changes, they may cause leakage and sparks due to aging of the line or equipment failure, which may bring potential safety hazards to the surrounding environment. Therefore, in order to protect the safety of the monitoring site, explosion-proof surveillance cameras are now available.
(I) The difference between explosion-proof cameras and ordinary industrial cameras
There is no essential difference between explosion-proof cameras and ordinary industrial cameras in terms of photoelectric structure. However, in some special industries, such as petroleum, chemical, natural gas and other industrial enterprises, various flammable and explosive gases, liquids and various dusts and fibers may leak and spread during the experiment, production, processing, transportation and storage, which is very likely to cause explosions and fires, causing significant losses to the country and the people.
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As the "good guy" in the camera industry, explosion-proof cameras can coexist peacefully with more than 100 "hot-tempered" flammable gases. Its most important feature is that it uses one or more explosion-proof forms to process industrial cameras, so that they can monitor in flammable and explosive on-site environments.
(II) The difference between explosion-proof cameras and riot-proof cameras
Many times, riot-proof cameras and riot-proof cameras are easily confused, and people are accustomed to comparing the two together, but in fact, riot-proof cameras and explosion-proof cameras are two products of different natures. Next, we will distinguish between the two in terms of concepts, application fields and manufacturing processes.
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1. Different concepts
Anti-riot cameras are also called high-security cameras, impact-resistant cameras, anti-strike cameras, and anti-destruction cameras. As the name implies, anti-riot cameras are cameras that can still ensure the normal operation of components under external violent attacks. The characteristic is that their shells have strong impact resistance.
Explosion-proof cameras belong to explosion-proof monitoring products. They are the cross-products of the explosion-proof industry and the monitoring industry. They have explosion-proof electrical performance and certification, and can use conventional camera products in high-risk flammable and explosive sites.
2. Different application fields
Explosion-proof cameras can be used in many enterprises or research departments such as petroleum, chemical, coal, scientific research, and military. In the process of experiment, production, processing, transportation and storage, various flammable and explosive gases, liquids, and various dusts and fibers may often leak and spread. After these substances are mixed with air, they will become a mixture that is prone to explosion hazards. The places near them have also become explosion-hazardous places to varying degrees, and the concentration of explosive mixtures may continue to increase.
When the concentration of explosives reaches the critical point of explosion, once the ignition source sparks, arcs and high temperatures appear, serious accidents such as explosions and fires will occur, causing casualties and property losses. In order to realize the application of monitoring in flammable and explosive on-site environments, explosion-proof cameras came into being.
The application of riot cameras is mainly concentrated in finance, public security, prisons, commerce, subways, mining and relatively harsh environments. It can not only be used to deal with man-made malicious acts of destruction, but also to deal with harsh natural and production environments, reducing their damage to the camera.
3. Different manufacturing processes
Most riot cameras are hemispherical or spherical in design, so the manufacturing process of the camera's transparent protective cover and upper shell will become the key to the camera's riot-proof ability. In order to meet the anti-violence requirements, more and more products' transparent protective covers are made of polycarbonate (PC) engineering plastics, and some manufacturers' products use polymethyl methacrylate (PMMA) engineering plastics (acrylic, acrylic) ball covers. The base of many spherical riot cameras uses a cast aluminum shell, which can withstand general strength impacts.
(III) Three mainstream types of explosion-proof cameras
There are three main types of explosion-proof cameras on the market: intrinsically safe, positive pressure, and flameproof. As time goes by, the flameproof type has gradually become the international mainstream type.
1) "Intrinsically safe" cameras
Starting from limiting the energy in the circuit, the camera reduces the potential spark energy to below the energy that can ignite the specified gas mixture through reliable control circuit parameters, and the heating temperature of the wire and component surface is limited to below the ignition temperature of the specified gas mixture. All circuits inside the camera are intrinsically safe circuits that cannot ignite the specified explosive gas environment under standard conditions (including normal operation and specified fault conditions). The cost of "intrinsically safe" cameras is relatively expensive.
2) "Positive pressure" explosion-proof cameras
Maintain continuous air or fill in inert gas in the camera to limit the flammable mixture from entering the camera through the outer shell.
3) "Flameproof" explosion-proof camera
The working principle is to enclose all the parts of the camera that may ignite the explosive gas mixture in a shell. The shell can withstand the internal explosion of the flammable mixture that penetrates into the shell through any joint surface or structural gap of the shell without damage, and will not cause the ignition of the explosive environment formed by one or more gases or vapors outside. The parts of the camera that may generate sparks, arcs and dangerous temperatures are placed in the flameproof shell, which isolates the internal space of the camera from the surrounding environment.
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