In order to ensure the reliability of the operation of the camera and the lens and prolong its service life, it is necessary to equip the camera with a cover with various special protective measures, called a protective cover. In addition, the protective cover can prevent human damage to the camera and lens as much as possible. The protective cover can be divided into indoor type and outdoor type depending on the place of use.
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Indoor protective cover
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. Interior guards are typically made of painted or anodized aluminum, painted steel, brass or plastic. If plastic is used, fire resistant or flame retardant type should be used. The shield must be strong enough that the mounting interface must be secure and the window should be clear and transparent with safety glass or plastic (polycarbonate). The electrical connections are designed to be easy to install and maintain.
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.
Outdoor protective cover
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. A defroster in front of the hood or on the glass melts the window when it is frosted or snowy.
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.
The auxiliary equipment control function of the outdoor type shield has two kinds of automatic control and manual control. For example, the heater/defroster and the fan are automatically activated or turned off by the temperature sensor inside the shield, and like a wiper, a washer, etc. The action is achieved by the controller through the operation of the control device.
Outdoor shrouds are typically made of aluminum, coated steel, stainless steel or plastic that can be used in outdoor environments. The manufacturing material must be able to withstand the irradiation of ultraviolet rays, otherwise the aging phenomenon such as cracking, fading, and strength reduction will occur soon. Stainless steel shrouds should be used in environments where helmets are required to be durable, highly safe, and resistant to vandalism; properly treated aluminum shrouds are also a good performance shroud. There are three treatment methods: polyurethane baking varnish, anodizing , anodizing and painting. Aluminum or steel mutual aid should not be used in corrosive atmospheres; stainless steel or special plastic shields should be used in salt spray environments. 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. There are many types of protective covers in the monitoring system, and generally can be divided into rectangular shields, wall or ceiling shields, ball shields, corner shields, and slope shields according to their shapes.
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