[ Pacific Security Network News ] Outdoor protective covers are generally highly sealed, resistant to cold, heat, sand, rain and snow, etc., to meet most of the needs but can not meet the needs of the harsh environment, the camera at this time In addition to the above characteristics, the shield also needs to be tamper-proof, impact-resistant, anti-corrosive, and even need to be used in an explosive environment. Therefore, the monitoring project must use a special shield with high safety. Therefore, the choice of the shield is also a big problem. What is the classification of the shield in the monitoring installation? The author summarizes the classification of the shield for your reference. The high pressure shield can be used in hazardous atmospheres. The requirements of the National Fire Protection Association can be met by filling the casing with pressurized inert gas. The shroud is made of corrosion-resistant thick-walled aluminum with a 1/2-inch thick tempered polished glass. The shroud was filled with low pressure nitrogen at a pressure of 15 psi. Nitrogen is completely inert and avoids explosions caused by electrical sparks or electrical faults in the shroud. An O-ring seal for sealing is placed between the cover body and the outer cover. All electrical connections are routed through a hermetic seal.
This is a shroud designed for use in elevators and hardened. The shroud is made of stainless steel and has a tamper-proof function. The lead-in wire is on the back of the shroud and is generally inaccessible to the guard; the window is a wear-resistant polycarbonate. The best orientation of the camera is 45° angle to the wall perpendicular to each other, and at the same angle of 45° to the ceiling plane. When the horizontal angle of view exceeds 90° (wide angle), the entire car can be observed. Any dead ends.
The high dust shield is similar to the universal shield, except that it is completely isolated from the outside world and can be used in sandy and dusty environments. It can also be used in corrosive environments if stainless steel is used. The window material is tempered glass for maximum safety, corrosion and wear resistance. In order to avoid excessive temperature inside the hood, a sun visor and a fan are often provided, and the internal temperature can be maintained by a filtered external compressed air source.
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 circulate air in 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.
The explosion-proof protective cover is the same 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. If the space inside the explosion-proof protective cover accommodates the camera and the lens assembly, the decoder can be installed to avoid the decoder. Re-create the trouble of the explosion-proof casing.
This type of protective cover is also commonly referred to as an armored protective cover. It is suitable for installation in prisons or other places where it is easily damaged by politics. It is made of 0.134 inch thick 10 gauge welded steel with 1/2 window material. Inch thick, abrasion resistant polycarbonate. The shroud 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.
The high temperature shield refers to a shield that protects the camera and the lens from working normally 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 cooling systems, semiconductor cooling systems, as well as vortex cooling, Freon, and ammonia refrigeration.
The above several shields are some of the shields that are particularly suitable for use in monitoring installations, and generally meet most of the needs.
This is a shroud designed for use in elevators and hardened. The shroud is made of stainless steel and has a tamper-proof function. The lead-in wire is on the back of the shroud and is generally inaccessible to the guard; the window is a wear-resistant polycarbonate. The best orientation of the camera is 45° angle to the wall perpendicular to each other, and at the same angle of 45° to the ceiling plane. When the horizontal angle of view exceeds 90° (wide angle), the entire car can be observed. Any dead ends.
The high dust shield is similar to the universal shield, except that it is completely isolated from the outside world and can be used in sandy and dusty environments. It can also be used in corrosive environments if stainless steel is used. The window material is tempered glass for maximum safety, corrosion and wear resistance. In order to avoid excessive temperature inside the hood, a sun visor and a fan are often provided, and the internal temperature can be maintained by a filtered external compressed air source.
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 circulate air in 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.
The explosion-proof protective cover is the same 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. If the space inside the explosion-proof protective cover accommodates the camera and the lens assembly, the decoder can be installed to avoid the decoder. Re-create the trouble of the explosion-proof casing.
This type of protective cover is also commonly referred to as an armored protective cover. It is suitable for installation in prisons or other places where it is easily damaged by politics. It is made of 0.134 inch thick 10 gauge welded steel with 1/2 window material. Inch thick, abrasion resistant polycarbonate. The shroud 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.
The high temperature shield refers to a shield that protects the camera and the lens from working normally 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 cooling systems, semiconductor cooling systems, as well as vortex cooling, Freon, and ammonia refrigeration.
The above several shields are some of the shields that are particularly suitable for use in monitoring installations, and generally meet most of the needs.
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