How to monitor the camera in extreme weather

On March 28, 2018, Beijing ushered in an annual fixed program, the sandstorm. On the morning of the 28th, the Beijing Meteorological Observatory issued a blue dust warning signal. Due to the influence of the upstream dust weather, it is expected that there will be floating dust weather on the 28th, and the visibility is low. At 7 o'clock in the morning, the average PM10 concentration in the city reached 1976 μg/m3, reaching a level of serious pollution. It is expected that by the night of the 28th, the dusty weather in the northeast and north China will be weakened and dissipated. If you succeed, you can also experience some extravagance in Beijing.

As a security media, our focus is of course not limited to the weather. Today we will talk about how the surveillance camera works in extreme weather.

The hood is highly versatile

As shown in the figure, this is the real shot of the core area of ​​Beijing Chaoyang CBD on the 28th. In the case of PM10 nearly 2000, the photographs appeared as if a retro filter was added, with traces of mottled years, covered with heavy historical sand, and also covered the tracking of the camera.

How to ensure that the surveillance camera works normally in harsh environments such as high, low temperature, sand, rain, ice and snow? With a variety of protective covers, you can extend their working life and ensure normal long-term work! Similar to the PTZ equipment, the protective cover is generally divided into general-purpose and special-purpose types, and can be divided into indoor type and outdoor type.

The indoor enclosure must be able to protect the camera and lens from dust, foreign matter and corrosive gases, and at the same time be able to match the installation site to prevent vandalism.

The camera's operating temperature is -5 ° C ~ 45 ° C, and the most suitable temperature is 0 ° C ~ 30 ° C, otherwise it will affect the image quality, and even damage the camera. Therefore, the outdoor protective cover should be adapted to various climatic conditions, such as wind, rain, snow, frost, low temperature, exposure, sand and the like. Outdoor shields may be configured with different locations such as sunshields, interior/external fans, heaters/defroaches, wipers, washers, etc.

First, the outdoor enclosure is highly sealed to prevent rain from entering. At the same time, the inlet should be opened under the protective cover to prevent rainwater from flowing down the cable into the protective cover. A wiper should also be installed in front of the shield to clean up the accumulated rain and dirt in time so that the camera can pass through the glass and capture clear images.

Secondly, the protective cover should be equipped with a heater, which is heated in a low temperature environment to raise the internal temperature of the protective cover to ensure the normal operation of the camera/lens; the internal or external fan can circulate the air inside the cover and reduce the temperature inside the protective cover. In the place where there is less wind and less rain, consider installing a Washer so that the window glass can be cleaned at any time with the wiper to ensure image monitoring.

In addition, in order to increase the safety performance of the protective cover and prevent human damage, many protective covers are also equipped with a tamper switch, and an alarm signal will be issued once the protective cover is opened.

Lightning protection also has a coup

Camera installation positions often have indoor and outdoor points. Cameras installed indoors are generally not subject to direct lightning strikes. However, lightning overvoltages may also cause damage to the camera, while outdoor equipment needs to be considered to prevent direct lightning strikes. In the face of this situation, how to do lightning protection?

Outdoor equipment, usually the front-end equipment such as the camera is placed within the effective protection range of the lightning receptor (lightning rod or other lightning conductor). When the camera is erected independently, in order to prevent the transient high potential of the lightning rod and the down conductor, the lightning rod * is 3-4 meters away from the camera.

For indoor cameras, in order to prevent electromagnetic induction, the camera power and signal lines along the poles should be placed in the metal tube to achieve shielding. Both ends of the shielded metal tube should be grounded.

In high temperature weather, you must do a good job of maintaining

In addition to the measures mentioned above for deploying a fan on a protective cover, manual maintenance is also extremely important. This is because the monitoring equipment stops working in hot weather, and there is a possibility that the temperature is too high and spontaneously ignited, causing a fire and causing greater losses.

Therefore, the following points should be made. First, strengthen inspection and patrol of monitoring equipment such as communities, enterprises, schools, etc., check equipment lines, and often perform maintenance inspections on old equipment to prevent equipment from aging and high temperature to induce safety accidents. Second, the community, enterprises and other units must provide a suitable working environment for the monitoring equipment. Fans and air conditioners can be installed in the monitoring room to adjust the temperature and control the temperature of the monitoring equipment. Third, in addition to artificial control and supervision, monitoring equipment temperature sensing alarm equipment also needs to be strengthened, technically early detection of safety hazards, to avoid equipment damage and property damage caused by high temperature.

In extreme cold weather, special means are needed

The surveillance camera should work normally, and its internal electronic components should be affected by the environment. If the temperature is too high or too low, it will be affected. If the ambient temperature is too low, the electronic device will not reach the preheat value, which will also affect the working characteristics of the machine. The same is true for the battery. Because the ambient temperature is too low, the internal chemical reaction and the energy released will slow down. The energy should not be fully utilized, which reduces the normal working time. Although it will not cause damage to the equipment, it will affect the work efficiency. One way to solve this problem is to install a protective cover; one is a built-in heating device.

Taking Blue Star as an example, in the reconstruction project of the Faraz Antarctic Scientific Research Station in Brazil, Blue Star successfully won the bid for the video surveillance construction project of the Faraz Antarctic Scientific Research Station. In this project, it is not only necessary to monitor the camera to work normally under extreme cold conditions of minus 40 degrees, but also to ensure that it can adapt to huge temperature differences as well as icing, storm intrusion and many other problems. During the project bidding process, Blue Star products stood out among many competitors due to their outstanding performance and high cost performance.

to sum up

The uncertainty, suddenness and devastating nature of bad weather often make the security monitoring equipment unprepared. How to keep the security monitoring equipment in good condition under extreme weather, improve the security monitoring level of the whole city, and better serve the safe city. On the one hand, we need reasonable planning of the city, strengthen the comprehensive deployment of security products, and be prepared for it; on the other hand, we also attach importance to the improvement of protective means to produce better performance products, even in the case of sudden extreme weather.