Explosion-proof Electronic Scale, Electronic Inverted Bucket Scale, Electronic Platform Scale; Electronic Platform Scale, Industry-specific Scale, Marking of Explosion-proof Lighting Fixtures
1. The shell of explosion-proof lighting fixtures must have a prominent permanent raised or recessed mark "Ex". A nameplate must be set in a conspicuous place on the shell. The nameplate should be clearly visible and properly positioned. For example, a warning label such as "Open cover after power off" should be placed near the opening.
2. Due to the frequent presence of corrosive gases in explosive environments, the markings on the shell of explosion-proof lighting fixtures should be made of materials like bronze, brass, stainless steel, or other materials with corrosion resistance no less than the aforementioned materials, with a thickness of no less than 1mm (for small lamps, the thickness can be no less than 0.5mm). They should also be securely fixed and not easily disappear or fall off.
3. The method to check the permanence of the marking is by lightly wiping with a cloth soaked in water for 15 minutes, then allowing it to dry, followed by wiping with a cloth soaked in gasoline for another 15 minutes. After visual inspection, the marking should still be clear and not fallen off.
4. The content of the nameplate marking should include:
- Explosion-proof mark.
- Basic marking: including product name, model, manufacturer's name, registered trademark, date of manufacture, etc.
- Performance safety marking: including rated voltage, current, nominal frequency, light source power and quantity, allowable environmental temperature (if the range is only -20°C to +40°C, it may not need to be marked), specific applicable environment marking (such as for products that are only suitable for a certain type of explosive gas mixture, the name or molecular formula of the flammable gas must be indicated), classification marking of the lamp (such as "number"), etc.
- Explosion-proof certificate number, proving that the product has been officially inspected by an explosion-proof inspection station.
Some products have an "x" mark after the explosion-proof certificate number, indicating that this type of product can only be used under certain special safe operating conditions. These specified conditions should be clearly stated on the lamp shell or in the product manual. For example: some old standard transition enhanced safety type explosion-proof lamps, because they use high-intensity gas discharge light sources, their explosion-proof safety performance is only equivalent to the current spark-free type explosion-proof lamps, so it should be noted "only suitable for Zone 2." For products that are only suitable for a certain type of explosive gas mixture, the name or molecular formula of the flammable gas must be explained. For explosion-proof lamps that are only suitable for a certain ignition temperature, the maximum detail temperature must be indicated. For explosion-proof lamps whose shells can only withstand low impact energy, it should be noted "only suitable for places with low risk of mechanical damage." There are many types of special safety operating conditions. When operators see the "x" mark after the explosion-proof certificate number, they should pay attention to understanding what special safety operating conditions this product actually has, so as to correctly operate during installation and operation and prevent risks.
D Additional statements. In addition to the above-mentioned markings, all necessary detailed statements required for correct installation, operation, and maintenance should be provided on the lamp, the internal ballast, or in the manufacturer's product manual accompanying the lamp. For example:
- The allowed mission position of the explosion-proof lamp. Some explosion-proof lamps can only be installed and used in a certain position or within a certain angle range. This is because the change in mission position will cause changes in the thermal distribution and maximum detail temperature of the explosion-proof lamp surface. The main reason for limiting the mission position of the explosion-proof lamp is to control the maximum detail temperature and prevent it from exceeding the temperature class marked on the explosion-proof lamp itself, thereby avoiding dangerous temperatures. Moreover, changes in mission position may affect the lifespan and performance of some light sources, as well as the insulation performance, lifespan, etc., of the lamp's insulating materials, electrical components, and wires. Therefore, explosion-proof lamps without restrictions on installation positions must clearly state this.
- To reduce the highest detail temperature of the explosion-proof lamp and lower the product's temperature group level, if specially designed light sources are selected for the explosion-proof lamp, the name, model, bulb shape and size, and manufacturer of the light source must be noted. If not noted, when the operator replaces the bulb with another one of the same power, the highest detail temperature of the explosion-proof lamp might exceed the ignition temperature of the explosive gas mixture in the operating environment, causing an explosion risk.
- Under the worst normal working conditions, if the highest temperature experienced by the insulation material of the power cable or wire inside the lamp exceeds 80°C, it should be marked so that corresponding cables and wires can be selected. If there are special requirements for the incoming cables or wires, the specifications, models, and applicable temperatures must be noted.
- Lamps with batteries must specify the type, nominal voltage, and nominal capacity of the battery to avoid loss and danger.
- For explosion-proof lamps with focusing and similar functions, the shortest distance from the illuminated object should be stated to prevent the illuminated object from being scorched or catching fire.
- The planned highest mission temperature tω (°C) of the ballast coil, the planned highest mission temperature tc (°C) of the capacitor, wiring diagram, etc., should be provided to help operators correctly install and maintain the lamp.
Before purchasing, installing, and operating explosion-proof lamps, operators must understand the product markings and instructions to correctly choose, install, and operate the explosion-proof lamps, ensuring the safety of product usage and maximizing its efficiency.
Shanghai Qinchou Industrial Company specializes in providing explosion-proof electronic scales, electronic inverted bucket scales, and electronic platform scales.