[ Huaqiang Security Network News ] Sometimes, the camera must be installed in a highly harsh environment, not only like a general-purpose outdoor protective cover, but also has the characteristics of high sealing, high cold resistance, heat resistance, sand resistance, rain and snow protection, etc. It is resistant to impact, corrosion and even needs to be used in explosive environments, so special protective covers with high safety must be used. 
(1) High-security protective cover <br> This kind of protective cover is also generally called armored protective cover. It is suitable for installation in prisons or other places that are easily damaged. It is welded by 0.134 inch thick No.10. Made of steel, the window material is 1/2 inch thick, anti-wear treated polycarbonate. The shield can withstand the impact of hammers, stones or certain bullets without being pierced or cracked. The casing is closed with a large mechanical lock and should not be taken apart.
(2) High dust protection cover <br> The high dust protection cover is similar to the universal protective cover. The difference is that the protective cover is completely isolated from the outside world and can be used in sandy and dusty environments. Can be used in corrosive environments. The window material is tempered glass for maximum safety, corrosion and wear resistance. In order to avoid excessive temperature inside the hood, a sun hood and a fan are often provided, and the temperature inside the hood can also be maintained by a filtered external compressed air source.
(3) Explosion-proof protective cover <br> The explosion-proof protective cover has the same explosion-proof requirements as the explosion-proof pan/tilt, and must also comply with the safety regulations for explosion-proof and dust-proof explosion electrical equipment. The material used is the same as the gimbal, usually a thick-walled all-aluminum structure or a stainless steel structure. The diameter of the explosion-proof protective cover is generally 6", 8", 10", etc., and the inlet line excuses are equipped with explosion-proof seals.
(4) High-temperature protective cover <br> The high-temperature protective cover refers to the protective cover for protecting the camera and lens when the camera is used in an environment where the camera is used at a temperature greater than 40 °C and cannot reach the normal working temperature by natural convection and radiation heat transfer. For high temperature environments, the shield should be specially cooled and cooled. Common cooling systems include air-cooling systems, water-cooled systems, and vortex cooling, Freon, and ammonia refrigeration.
The air-cooling system still uses the principle of air flow cooling. The forced air is used to send the coolant (purified air) into the shield or the shield compartment to remove the heat from the shield for cooling purposes. The forced air cooling system has both direct cooling and indirect cooling.
When the ambient temperature is greater than 80 ° C (such as heating furnace, steelmaking furnace, etc.) by forced air cooling can not control the temperature rise, forced water cooling system can be used. The thermal conductivity and specific heat of water are both larger than that of air. Therefore, compared with air cooling, the thermal resistance of the heat exchanger is greatly reduced, and the heat exchange efficiency is improved. The shield contains a built-in water jacket that effectively isolates the camera and lens from the outside environment. Depending on the application, the material can be aluminum or stainless steel. A fan is arranged inside the shield to recirculate the air inside the cover to improve heat transfer efficiency. There are two basic types of forced water cooling systems, one is water-cooled and dustproof. The structure is relatively simple, without alarm device and air filtration system. The lens can use fixed focus or zoom lens for 80 °C environment. The other is a high temperature type in the furnace, which can be used in environments with temperatures up to 1600 °C. The structure is complex. The whole system has alarm, air filtration system, maintenance shutter and high temperature automatic exit system.
(2) High dust protection cover <br> The high dust protection cover is similar to the universal protective cover. The difference is that the protective cover is completely isolated from the outside world and can be used in sandy and dusty environments. Can be used in corrosive environments. The window material is tempered glass for maximum safety, corrosion and wear resistance. In order to avoid excessive temperature inside the hood, a sun hood and a fan are often provided, and the temperature inside the hood can also be maintained by a filtered external compressed air source.
(3) Explosion-proof protective cover <br> The explosion-proof protective cover has the same explosion-proof requirements as the explosion-proof pan/tilt, and must also comply with the safety regulations for explosion-proof and dust-proof explosion electrical equipment. The material used is the same as the gimbal, usually a thick-walled all-aluminum structure or a stainless steel structure. The diameter of the explosion-proof protective cover is generally 6", 8", 10", etc., and the inlet line excuses are equipped with explosion-proof seals.
(4) High-temperature protective cover <br> The high-temperature protective cover refers to the protective cover for protecting the camera and lens when the camera is used in an environment where the camera is used at a temperature greater than 40 °C and cannot reach the normal working temperature by natural convection and radiation heat transfer. For high temperature environments, the shield should be specially cooled and cooled. Common cooling systems include air-cooling systems, water-cooled systems, and vortex cooling, Freon, and ammonia refrigeration.
The air-cooling system still uses the principle of air flow cooling. The forced air is used to send the coolant (purified air) into the shield or the shield compartment to remove the heat from the shield for cooling purposes. The forced air cooling system has both direct cooling and indirect cooling.
When the ambient temperature is greater than 80 ° C (such as heating furnace, steelmaking furnace, etc.) by forced air cooling can not control the temperature rise, forced water cooling system can be used. The thermal conductivity and specific heat of water are both larger than that of air. Therefore, compared with air cooling, the thermal resistance of the heat exchanger is greatly reduced, and the heat exchange efficiency is improved. The shield contains a built-in water jacket that effectively isolates the camera and lens from the outside environment. Depending on the application, the material can be aluminum or stainless steel. A fan is arranged inside the shield to recirculate the air inside the cover to improve heat transfer efficiency. There are two basic types of forced water cooling systems, one is water-cooled and dustproof. The structure is relatively simple, without alarm device and air filtration system. The lens can use fixed focus or zoom lens for 80 °C environment. The other is a high temperature type in the furnace, which can be used in environments with temperatures up to 1600 °C. The structure is complex. The whole system has alarm, air filtration system, maintenance shutter and high temperature automatic exit system.
Key Cabinet,Key Safe Lock Box,Wall Mount Key Box,Wall Mount Digit Key Box
Uni-Sec (Ningbo) Electronics Technology Co., Ltd. , https://www.hospitalityunisec.com