1. The new lamp tube is black, and the lamp tube contains debris?
Ultraviolet lamps commonly used in ultraviolet sterilizers are made by using mercury vapor pressure to mix gas with various other dissimilar metals and placing them in a vacuum glass cavity. The lamp tube contains an indispensable element: mercury. Before the mercury is completely evaporated, its shape is stored in the lamp tube in the form of particles. Other metals will also attach to the tube wall like dirt, which will appear particularly clear in some transparent tubes. But don’t worry, this is generally normal.
2. Black at the beginning
The new lamp tube of the ultraviolet sterilizer or some lamps that have not been used for a long time, once the lamp is turned on, there will be a cloud of black gas in the filament part. Is this a bad rhythm? Of course not. This black gas is actually mercury vapor. The mercury gathered around the filament begins to evaporate when heated, and volatilizes upwards along the tube wall. The color becomes lighter and lighter, and finally disappears.
Of course, not every lamp is like this, because not every lamp’s mercury happens to gather around the filament, which is a normal phenomenon unique to new lamps.
3. The lamp turns black after turning off the light
4. Cold end black spots
- The power supply error is too large during use.
- Too many frequent switches.
- The starting voltage is too high or the preheating time is incorrect, and there are too many flashes.
- The preheating current of the ballast is too large.
- The starting voltage is too high or the preheating time of the electronic ballast is insufficient.
5. Black circles like rings
After long-term use of the UV sterilizer tube, the metal halide bulb has a black ring around the filament. This is because each time the lamp is turned on, the ions produced by the cathode are relatively heavy, and the Caused by the tube wall, this is a natural phenomenon and has nothing to do with the life of the tube and the light effect.
6. Cause discoloration of the pipe wall
In the production process, if the heating and baking and exhausting and vacuuming processes are not perfect, hydrogen will remain, which will also be combined with mercury to deteriorate and pollute the fluorescent lamp powder. If a new tube occurs immediately, it is a defective lamp. Tube-(yellow and black). In addition, the soda lime glass or high-lead glass used to make the lamp tube contains a large amount of sodium. During the lighting process, sodium will precipitate from the glass tube, combine with mercury, and become sodium amalgam, which is deposited in the fluorescent lamp powder layer, resulting in fluorescent lamps Powder spoiled.
Of course, the safest way is to install an ultraviolet intensity monitor to help us grasp the working conditions of the ultraviolet lamp.
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