Key points for selection, installation, use and maintenance of explosion-proof cameras
2024-4-11 View：
In order to realize the application of industrial television monitoring in flammable and explosive on-site environments, explosion-proof cameras came into being. Explosion-proof cameras have also begun to be widely used in various fields. It is worth noting that, unlike the general situation in the electronics industry, the development of China's explosion-proof cameras is quite early in the international industry in terms of time, and in terms of technical level, it is always no less than similar foreign products.
As far as the field of explosion protection is concerned, our country has always been at the forefront of the world in explosion protection research, and the country has formulated a series of explosion protection standards. The explosion-proof level has corresponded to the explosion-proof level standards of major countries in the world, and many parameters are higher than those in European and American countries; my country's management of explosion-proof equipment is also very strict. For example, an "explosion-proof certificate" will be issued after passing the design review of explosion-proof products, a "production license" that must be held for the production of explosion-proof products, etc.
As far as the explosion-proof camera itself is concerned, there is no essential difference between the optoelectronic structure and ordinary industrial cameras. It is characterized by using one or more explosion-proof measures to process the industrial camera so that it can be used in flammable and explosive on-site environments.
Selection of explosion-proof cameras
To choose a suitable explosion-proof camera, you actually need to choose explosion-proof cameras with different explosion-proof types, different explosion-proof levels and temperature groups, and different shell materials according to the different environments and conditions on site.
Simply put, explosion-proof products are basically divided into the following three categories in terms of explosion-proof types:
1. Class I mining methane - used in coal mines (explosion-proof for mining): intrinsically safe type, its explosion-proof mark is ExibⅠ; explosion-proof type, its explosion-proof mark is ExdⅠ
2. Category II explosive mixed gas - used in chemical industry, oil fields, oil tanks, petrochemicals, oil refining, military industry, aerospace and other factories (gas explosion-proof): commonly used explosion-proof type, its explosion-proof mark is ExdⅡA, ⅡB, ⅡC.
Note: Product technical standard GB 3836.2-2000, Electrical equipment for explosive gas environments Part 2: Explosion-proof type "d" This is the most common situation. The following non-specific specifications are all gas explosion-proof explosion-proof types.
3. Category III Explosive Dust and Fiber - Used in dusty environments such as grain processing plants and grain depots: Dust explosion-proof electrical equipment is generally used, and its explosion-proof mark is Ex DIP.DT.T13.
Key points for installing explosion-proof cameras
Electrical installation in explosive environments shall in principle be in accordance with GB50058-92 "Technical Specifications for Electrical Design in Explosion and Fire Hazardous Locations", GB 50257-96 "Code for Construction and Acceptance of Electrical Devices in Explosion and Fire Hazardous Environments for Electrical Installation Projects", CD90B-85 " General drawings for wiring and electrical equipment installation in explosive hazardous locations and IEC 79-14, 1996e Electrical equipment for explosive gas atmospheres Part 14: Electrical installation in hazardous locations (except coal mines).
However, electrical installation in hazardous locations should first meet the requirements of the general electrical installation specifications. That is to say, after meeting the requirements of the general electrical installation specifications, electrical installations in hazardous locations must also meet the special requirements in the above standards. For example: in general electrical installation, black tape is a commonly used insulation wrapping material, but it is not allowed to be used in hazardous locations. Where insulation must be wrapped, self-adhesive tape is required. Electrical installation in hazardous locations should focus on safety. Use as few electrical products as possible in hazardous locations. The installation location must also avoid release sources and avoid the influence of heat, water, vibration and other effects from process pipes.
Key points for use and maintenance of explosion-proof cameras
In order to prevent damage to the explosion-proof structure and performance of explosion-proof cameras, professional inspection and maintenance of the equipment should be the responsibility of end-user professional electrical technicians who have been trained in explosion-proof technology.
1. The cable inlet of the explosion-proof camera must be sealed with a rubber sealing ring. It is prohibited to use other methods such as filling sealing putty or asbestos rope instead; it is prohibited to fill the cavity with any substance. Loss of explosion-proof performance; it is prohibited to discard the sealing ring and matching compression nut at the cable inlet for the sake of convenient connection; it is prohibited to merge multiple single wires into the cable inlet through a single-hole elastic sealing ring. The oil stains on the rubber sealing ring should be scrubbed clean to avoid aging and deterioration.
2. It is strictly prohibited to arbitrarily modify the structure, parts and internal circuits of the explosion-proof camera. The fastening bolts must not be arbitrarily replaced or missing. The elastic sealing gasket and metal gasket of the excess inlet and outlet must remain sealed at the factory, and the compression nut should be tightened to seal the inlet.
3. It is prohibited to conduct maintenance of electrical equipment and circuits while powered on in explosion-risk areas, and it is prohibited to schedule power transmission or power outage. A warning sign saying "No closing is allowed when someone is working" should be hung at the power outage. During maintenance, if the explosion-proof camera is dismantled to a safe area, the power cable ends of the equipment on site should be explosion-proof and it is strictly prohibited to energize it.
4. During daily operation and maintenance inspections, try to avoid opening the explosion-proof camera casing. If it must be opened, the power supply should be cut off first. If the flameproof shell is opened, the flameproof surface should be properly protected and not damaged. During maintenance, the flameproof surface should be placed upward and not directly in contact with the ground. After cleaning, the flameproof surface should be coated with phosphating paste or 204 anti-rust oil.
5. All explosion-proof cameras should establish equipment files, from equipment installation, commissioning, operation, maintenance, to explosion-proof downgrading and scrapping of the equipment. Various technical data from different periods should be collected, archived, and numbered one by one on the equipment.
As far as the field of explosion protection is concerned, our country has always been at the forefront of the world in explosion protection research, and the country has formulated a series of explosion protection standards. The explosion-proof level has corresponded to the explosion-proof level standards of major countries in the world, and many parameters are higher than those in European and American countries; my country's management of explosion-proof equipment is also very strict. For example, an "explosion-proof certificate" will be issued after passing the design review of explosion-proof products, a "production license" that must be held for the production of explosion-proof products, etc.
As far as the explosion-proof camera itself is concerned, there is no essential difference between the optoelectronic structure and ordinary industrial cameras. It is characterized by using one or more explosion-proof measures to process the industrial camera so that it can be used in flammable and explosive on-site environments.
Selection of explosion-proof cameras
To choose a suitable explosion-proof camera, you actually need to choose explosion-proof cameras with different explosion-proof types, different explosion-proof levels and temperature groups, and different shell materials according to the different environments and conditions on site.
Simply put, explosion-proof products are basically divided into the following three categories in terms of explosion-proof types:
1. Class I mining methane - used in coal mines (explosion-proof for mining): intrinsically safe type, its explosion-proof mark is ExibⅠ; explosion-proof type, its explosion-proof mark is ExdⅠ
2. Category II explosive mixed gas - used in chemical industry, oil fields, oil tanks, petrochemicals, oil refining, military industry, aerospace and other factories (gas explosion-proof): commonly used explosion-proof type, its explosion-proof mark is ExdⅡA, ⅡB, ⅡC.
Note: Product technical standard GB 3836.2-2000, Electrical equipment for explosive gas environments Part 2: Explosion-proof type "d" This is the most common situation. The following non-specific specifications are all gas explosion-proof explosion-proof types.
3. Category III Explosive Dust and Fiber - Used in dusty environments such as grain processing plants and grain depots: Dust explosion-proof electrical equipment is generally used, and its explosion-proof mark is Ex DIP.DT.T13.
Key points for installing explosion-proof cameras
Electrical installation in explosive environments shall in principle be in accordance with GB50058-92 "Technical Specifications for Electrical Design in Explosion and Fire Hazardous Locations", GB 50257-96 "Code for Construction and Acceptance of Electrical Devices in Explosion and Fire Hazardous Environments for Electrical Installation Projects", CD90B-85 " General drawings for wiring and electrical equipment installation in explosive hazardous locations and IEC 79-14, 1996e Electrical equipment for explosive gas atmospheres Part 14: Electrical installation in hazardous locations (except coal mines).
However, electrical installation in hazardous locations should first meet the requirements of the general electrical installation specifications. That is to say, after meeting the requirements of the general electrical installation specifications, electrical installations in hazardous locations must also meet the special requirements in the above standards. For example: in general electrical installation, black tape is a commonly used insulation wrapping material, but it is not allowed to be used in hazardous locations. Where insulation must be wrapped, self-adhesive tape is required. Electrical installation in hazardous locations should focus on safety. Use as few electrical products as possible in hazardous locations. The installation location must also avoid release sources and avoid the influence of heat, water, vibration and other effects from process pipes.
Key points for use and maintenance of explosion-proof cameras
In order to prevent damage to the explosion-proof structure and performance of explosion-proof cameras, professional inspection and maintenance of the equipment should be the responsibility of end-user professional electrical technicians who have been trained in explosion-proof technology.
1. The cable inlet of the explosion-proof camera must be sealed with a rubber sealing ring. It is prohibited to use other methods such as filling sealing putty or asbestos rope instead; it is prohibited to fill the cavity with any substance. Loss of explosion-proof performance; it is prohibited to discard the sealing ring and matching compression nut at the cable inlet for the sake of convenient connection; it is prohibited to merge multiple single wires into the cable inlet through a single-hole elastic sealing ring. The oil stains on the rubber sealing ring should be scrubbed clean to avoid aging and deterioration.
2. It is strictly prohibited to arbitrarily modify the structure, parts and internal circuits of the explosion-proof camera. The fastening bolts must not be arbitrarily replaced or missing. The elastic sealing gasket and metal gasket of the excess inlet and outlet must remain sealed at the factory, and the compression nut should be tightened to seal the inlet.
3. It is prohibited to conduct maintenance of electrical equipment and circuits while powered on in explosion-risk areas, and it is prohibited to schedule power transmission or power outage. A warning sign saying "No closing is allowed when someone is working" should be hung at the power outage. During maintenance, if the explosion-proof camera is dismantled to a safe area, the power cable ends of the equipment on site should be explosion-proof and it is strictly prohibited to energize it.
4. During daily operation and maintenance inspections, try to avoid opening the explosion-proof camera casing. If it must be opened, the power supply should be cut off first. If the flameproof shell is opened, the flameproof surface should be properly protected and not damaged. During maintenance, the flameproof surface should be placed upward and not directly in contact with the ground. After cleaning, the flameproof surface should be coated with phosphating paste or 204 anti-rust oil.
5. All explosion-proof cameras should establish equipment files, from equipment installation, commissioning, operation, maintenance, to explosion-proof downgrading and scrapping of the equipment. Various technical data from different periods should be collected, archived, and numbered one by one on the equipment.