Talking about the Function and Type of Surveillance Camera Protective Cover

In order to ensure the reliability of the camera and the lens, and to extend the service life, the camera must be equipped with a cover with a variety of special protective measures, called a protective cover. In addition, the protective cover can also prevent human damage to the camera and the lens. The protective cover can be divided into indoor type and outdoor type according to different locations.

Indoor protective cover The indoor protective cover must be able to protect the camera and the lens from dust, impurities and corrosive gas contamination, and at the same time be able to meet the installation site to prevent damage. Indoor shields are generally made of painted or anodized aluminum, painted steel, brass or plastic. If plastic is used, it should be fire-resistant or flame retardant. The protective cover must have sufficient strength, the mounting interface must be strong, and the window should be clear and transparent safety glass or plastic (polycarbonate). The design location of the electrical connection should be easy to install and maintain.

The operating temperature of the camera is -5°C to 45°C, and the most suitable temperature is 0°C to 30°C, otherwise it will affect the image quality and even damage the camera. Therefore, the outdoor protective cover must adapt to various weather conditions, such as wind, rain, snow, frost, low temperature, exposure, sand and dust. The outdoor protective cover will be equipped with different equipment such as sun shields, interior/exterior fans, heaters/defrosters, wipers, and washers.

Outdoor protective cover First of all, the outdoor protective cover has a high degree of tightness to prevent rain water from entering. At the same time, the inlet opening should be opened under the protective cover to prevent the rain from flowing back into the protective cover along the cable. A wiper should also be installed in front of the hood so that the accumulated rainwater and dirt can be cleared in time so that the camera can take a clear image through the glass. The defroster on the front of the hood or on the glass melts the window when it accumulates frost and snow.

Secondly, a heater should be installed inside the protective cover to heat in a low temperature environment to raise the temperature inside the protective cover to ensure the normal operation of the camera/lens; the built-in or external fan can make the air in the cover circulate and reduce the temperature inside the cover. It is also necessary to consider the configuration of cleaners in locations where there is little wind and sand and little rain, so that the window glass can be cleaned at any time in conjunction with the wiper to ensure the image monitoring effect.

The auxiliary equipment control function of the outdoor protective cover is automatic control and manual control, such as the heater/defroster and the fan are automatically started or closed by the temperature sensor inside the protective cover, like a wiper, a washer, etc. The action is achieved by the control personnel through the operation of the control device.

Outdoor shields are generally made of aluminum, coated steel, stainless steel, or plastic that can be used in outdoor environments. The manufacturing materials must be able to withstand the irradiation of ultraviolet rays, otherwise they will soon be cracked, faded, and reduced in strength. Stainless steel shrouds should be used in environments where shrouds are required to be durable, high in safety, and resistant to vandalism; properly treated aluminum shrouds are also excellent shrouds, and there are three treatments: polyurethane paints, anodizing Anodized plus paint. In a corrosive gas environment, aluminum or steel should not be selected for mutual assistance; in salt spray environments, shields made of stainless steel or special plastics should be used. In addition, in order to increase the safety performance of the protective cover and prevent man-made damage, many protective covers are also equipped with a tamper switch. Once the protective cover is opened, an alarm signal will be issued. There are various kinds of protective covers in the monitoring system, which can be generally classified into rectangular guards, wall or ceiling guards, ball guards, corner guards, and slope guards according to their shapes.