Explosion-proof cameras are explosion-proof monitoring products, which are the cross-products of the explosion-proof industry and the monitoring industry. Because they can not use conventional camera products at high-risk flammability and explosive sites, they need products with explosion-proof functions and relevant certificates issued by national authorities. It is called an explosion-proof camera.
There are currently three types of explosion-proof cameras on the market: intrinsically safe, positive pressure, and explosion-proof.
The "intrinsically safe type" starts with the energy in the limiting circuit. The internal vibration of the camera is reduced by the reliable control circuit parameters to the energy of the specified gas mixture. The heating temperature of the wire and the component surface is limited to the specified gas mixture. Under the ignition temperature. All circuits inside the camera are intrinsically safe circuits that do not ignite the specified explosive atmosphere under any standard specified conditions (including normal operation and specified fault conditions), due to "intrinsically safe" The type of camera is relatively expensive and is rarely seen on the market.
The “positive pressure type†explosion-proof type is to maintain continuous air or inert gas in the camera to restrict the flammable mixture from entering the inside of the camera through the casing.
The most common explosion-proof camera on the market today is a "explosion-proof" explosion-proof type, which encloses all components of the camera that may ignite the explosive gas mixture in a casing that can withstand any joint or structural clearance through the casing. The flammable mixture that penetrates into the interior of the enclosure explodes internally without damage and does not cause an external igniting of an explosive atmosphere formed by one or more gases or vapors. The components of the camera that may generate sparks, arcs, and dangerous temperatures are placed in an explosion-proof enclosure that separates the interior of the camera from the surrounding environment.
There is a gap in the flameproof enclosure. Due to the respiration of the electrical equipment and the gas permeation, there may be an explosive gas mixture inside. When it explodes, the outer casing can withstand the explosion pressure generated without damage, and the outer structure gap can cool the flame and reduce The flame spreads or terminates the acceleration chain, so that the flame or dangerous flame products cannot ignite the external explosive environment through the explosion-proof gap, thereby achieving the purpose of explosion-proof.
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