Generally, explosion-proof infrared cameras adopt a sealed design with a protection level of IP68. However, the infrared lamp will generate a lot of heat when it starts to work. At the same time, due to the insufficient heat dissipation effect of the outer shell and the poor sealing of the machine itself, after the machine is used for a period of time, more or less soda will appear inside (this phenomenon is mainly concentrated in in the northern region), affecting the monitoring effect.

For example, in indoor and outdoor monitoring applications, the disadvantage of explosion-proof infrared cameras is that they are prone to fogging. Faced with such a problem, our engineering contractors will have a headache. We receive calls from customers every three days, asking what kind of explosion-proof infrared cameras you have installed. The camera? It became blurry within a few days, and I couldn’t even see the surveillance video clearly.

In fact, most of the "fogging" people are talking about is not water vapor. Think about how hot the LED panel is, and the heater used for general defogging is not as hot as it, and the water vapor has long been evaporated. Fogging should be caused by the moisture inside the explosion-proof infrared camera rapidly rising in temperature. The fogging problem is most serious when the temperature difference between the camera and the outside is large.

Then the explosion-proof infrared camera lens looks foggy, mainly for the following reasons:

1. Lens sealing. The lens hood leaks light and is not tightly sealed with the glass. Infrared light is refracted into the lens, especially the 4mm lens.
2. Component quality. The parameters of the machine board itself are wrong. If you just use an ordinary machine board and replace the filter with it, it will be fine during the day, but there will definitely be a problem at night, and it will be completely white and you can't see anything clearly;
3. The motherboard is overheated. The mainboard current is high, the distribution of infrared lights is unreasonable, and the white background of the CCD floats upward, making it look white and foggy. To put it bluntly, fogging is mainly caused by insufficient waterproofing. Coupled with the humidity of the air, the heat generated by the infrared lamp and CCD board when working causes water mist.

Undoubtedly, the fogging of explosion-proof infrared cameras is also related to the lens. In order to reduce costs, some manufacturers purchase some cheap raw materials. As far as the products in the current explosion-proof camera market are concerned, there are still many substandard products circulating in the market.

We all know that some cameras will fog up even at room temperature. Here we need to distinguish whether the explosion-proof infrared camera fogs due to internal or external reasons of the machine and uses different solutions.

Fog appears inside the machine: Fog and frost are formed due to the condensation of saturated water vapor in the air when it encounters cold. Depending on the strength or weakness of the cold environment, it condenses into frost and fog respectively. During the working process of explosion-proof infrared cameras, especially indoor cameras, fog or frost will often form on the protective cover window glass due to fog or water vapor in the venue, causing the camera to be unable to see objects clearly, directly affecting the monitoring effect.

Different manufacturers have different solutions to this problem. Add a defrost circuit, open air holes, fill with nitrogen, add a fan, put in desiccant, etc. The methods are different, and the results are of course different. Some problems can be solved, and some problems still cannot be solved. However, from the most basic point of view, it is necessary to strictly control the quality and cleanliness of materials and try to eliminate the presence of volatile matter. For example, there should be no residual flux on the PCB board, and the light shielding plate should be made of high-quality silicone material.

Frost and fog appear on the outside of the machine: The explosion-proof infrared camera works in a humid environment, and dust and other dirt are prone to appear on the window glass of the protective cover, causing the camera lens to be blocked from sight.

There are three main solutions to this situation:
1. Add a wiper to the protective cover and clean the glass by controlling the wiper.
2. Use invisible wipers to clean the window glass. Compared with ordinary window glass, invisible wiper window glass has the function of repelling rainwater, dust, etc.
3. Some requirements for shell sealing under high humidity conditions. If explosion-proof infrared cameras are used in the north, there will be a large temperature difference between the inside and outside of the machine, and the front lens will be atomized. Therefore, the machine must have good sealing, and the protective cover must also be good against rain, Waterproof and dustproof performance.

Generally speaking, the solution to fogging of explosion-proof infrared camera lenses can be from the following three aspects:

1. Improve the motherboard current;
2. Keep the camera application environment dry and ventilated;
3. Ensure product quality.

Therefore, in high-risk environments, when engineers choose explosion-proof camera products, it is best to use explosion-proof products that meet national standards. Rongfang explosion-proof cameras are widely used in high-risk areas such as petroleum, chemical industry, natural gas, and military industry.

     Shenzhen Rongfang, the explosion-proof surveillance brand you can always trust!!