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Introduction to surveillance cameras shield function and type

Date:2012-11-28

In order to ensure the reliability of the cameras, lenses, and prolong its service life, must give the camera has a variety of special insurance cover assembly, referred to as a shield. In addition, the shield can also try to prevent man-made destruction of the cameras and lenses. Shield sites according to the use of different type can be divided into indoor and outdoor.

Indoor shield

Indoor shield must be able to protect the camera and lens, from dust and impurities and corrosive gas pollution, at the same time to be able to cooperate with the purpose of installation location to prevent damage. Indoor cover the use of paint or general by anodic oxidation of aluminium, painted steel, brass or plastic, if use plastic, should use refractory or flame retardant. Protective cover must have enough strength, the installation interface must be strong, Windows should be clear transparent glass or plastic (polycarbonate). The design of the electrical connection in the mouth position should be easy to install and maintain.

Camera working temperature is 5 ℃ ~ 45 ℃, and the most suitable temperature is 0 ℃ ~ 30 ℃, otherwise it will affect the image quality and even damage the camera. So the outdoor type shield to adapt to the climate conditions, wind, rain, snow, frost, low temperature, sunlight, dust, etc. Outdoor type shield will use different configuration of the place such as the sun shade, inside/outside pack fan, heater/defroster, wipers, washer and other auxiliary equipment.

Outdoor shield

First, outdoor cover sealing, in order to avoid the rain in. Service entrance at the same time to open in the bottom of the shield, to avoid the rain along the cable to pour into the housing. Also should be installed at the front shield wipers, so that timely clean by the rain and dirt, can make the camera through the glass, clear image. Cover before or on the glass defroster in Windows frost deposit, when the snow to melt it.

Second, the guard should be equipped with heater, heating in low temperature environment, improve internal temperature of the shield, to ensure normal work of the camera/lens; Inside pack or a fan can make the enclosure outside air circulation, reduce the temperature in the shield; At the place to consider more sand less rain configuration cleaners, so that visual window at any time with the wiper clean, ensure the image monitoring results.

Outdoor type shield auxiliary equipment has automatic control and manual control two kinds of control functions, such as heater/defroster, fans are made by shield the internal temperature sensor on or off automatically, while actions, such as the wipers, washer is controlled by the controllers based on the operation of the equipment.

Outdoor cover general use of aluminum, coated steel, stainless steel or plastic manufacturing can be used in outdoor environment. Production material must be able to tolerate the exposure to the sun's ultraviolet rays, or back soon appeared the ageing phenomenon such as crack, fade, the intensity is reduced. In need to cover and durable, with a high degree of safety, can resist the unspoiled environment should use stainless steel shield; Through proper processing of aluminum shield shield is also a kind of excellent performance, there are three kinds of methods: pu lacquer that bake, anodic oxidation, anodic oxidation and paint. In corrosive gas environment should not choose aluminum or steel cooperation; In the salt fog environment should use stainless steel or special plastic cover. In addition to increase the cover of the safety performance, to prevent man-made damage, a lot of the shield is also equipped with a tamper switch, once the shield is opened will send alarm signal. Cover a wide variety of monitoring and control system, general but according to its shape is divided into rectangular shield, wall or ceiling with a shield.

 

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