Do you want the explosion-proof camera to be "positive pressure" or "explosion-proof"?

Now explosion-proof cameras are widely used in various fields, and there are many kinds of explosion-proof cameras on the market. Recently, many friends privately asked Bian Xiao how to choose an explosion-proof camera. What should I pay attention to when choosing an explosion-proof camera? Today, I will talk about explosion-proof cameras from a professional perspective with Mr. Fang, the general manager of Li, and see how to choose explosion-proof cameras.

Types of explosion-proof cameras

When it comes to the choice of explosion-proof camera, the first thing to look at is his category. At present, there are three types of explosion-proof cameras on the market: intrinsically safe, positive pressure and flameproof.

"Intrinsically safe" begins with limiting the energy in the circuit. By reliably controlling the circuit parameters, the potential spark energy can be reduced to less than the energy that can ignite a specific gas mixture.

The "positive pressure" explosion-proof type is to keep continuous air or fill inert gas in the camera to limit the combustible mixture from entering the camera through the shell. Now, due to the high cost of "intrinsically safe positive pressure" camera, it is rare in the market.

At present, the most common explosion-proof camera on the market is the "flameproof" explosion-proof camera, which encloses all the parts of the camera that may ignite explosive gas mixture in a shell, and its shell can withstand the internal explosion of combustible mixture penetrating into the shell through any joint surface or structural gap of the shell without damage. Therefore, from a professional point of view, the most important thing to choose an explosion-proof camera is to start with an explosion-proof shell.

What are the housing shields of explosion-proof cameras?

1, high voltage shielding

High voltage shielding can be used in harmful environment. By filling the shell with pressurized inert gas, the requirements of the National Explosion Protection Association can be met. The protective cover is made of corrosion-resistant thick-walled aluminum, and the window is toughened and polished glass with a thickness of 1/2 inches. The shield is filled with low-pressure nitrogen with a pressure of 15 lb/m2. Nitrogen is completely inert, which can avoid the explosion caused by electric spark or electrical fault in the protective cover. An O-ring for sealing is arranged between the shield and the outer cover. All electrical connections shall be led out through airtight sealing rings.

2, high dust cover

The high dust cover is similar to the general protective cover except that it is completely isolated from the outside world and can be used in a sandy and dusty environment. If stainless steel is used, it can also be used in corrosive environment. The window material is tempered glass, which can provide maximum safety, corrosion resistance and wear resistance. In order to avoid the high temperature in the range hood, awnings and fans are often equipped, and the internal temperature can also be maintained by the filtered external compressed air source. The air cooling system still uses the principle of airflow cooling, and sends the refrigerant (purified air) into the hood or the compartment of the hood through forced ventilation to take away the heat in the hood and achieve the purpose of cooling.

3. Armored protective cover

This kind of shield is suitable to be installed in prisons or other places that are easily damaged by politics. It is made of 10 welding steel with a thickness of 0. 134 inch, and the window material is polycarbonate with a thickness of 1/2 inch. Shields can withstand the impact of hammers, stones or some bullets without being punctured or broken. The shell is closed with a large mechanical lock and should not be disassembled.