Why black uv lamp?

Why black uv lamp? Sometimes encountered in the process of using uv sterilizer under similar circumstances, uv lamp before use is normal, but partly darkened after use. Because the tubes have quality problems? Or error? Why are uv lamp black? After dark, the sterilization efficiency will be affected? 1. The new lamp black, containing impurities inside the tubes? Uv lamp, uv sterilizer usually USES is using the mercury vapor pressure, and other various heterogeneous metals with mixed gas, put into a vacuum glass cavity in the body. Tubes contained within one of the indispensable elements: mercury, mercury not completely evaporate before, it is the shape of particles in the form of tubes. Other metals would like dirt attached to the wall, in some transparent tubes, can appear particularly clear. But don't worry, generally speaking this is normal phenomenon. 2. Just began to use new black uv sterilizer or some long time no use, arranged one, but the light in the filament parts will have a mass of black, is this broken rhythm? Of course not, this mass of black is mercury vapor gas, crowded around the filament of mercury began after evaporation, when it is heated up the wall and volatile, color is more and more weak, finally disappear. , of course, not every single tube are so, because not every single tube of mercury just assembled around the filament, this is a normal characteristic of the new tubes. 3. Lights out black lamp uv sterilizer after the lights went out, because mercury will be cooling and condensation, the features of the most cold end have gathered in the tubes. So in the coldest parts of the bulb, or close to the air conditioning parts, often mercury repeated evaporation condensation and traces of mercury pollution, this is a normal phenomenon. Cold end black spot uv sterilizer tubes after short term use, often see there is a black dot by filament, and will be used as longer time and more and more big. The reason is that more and more thin the tubes, power is more and more big, the filament is more and more long, filament electrode is more and more close to the wall, in every light preheating, if when the ion bombardment, is attached to the wall easily and cause the black dot, can produce such a reason has the following several ways: in the process of using the power error is too big. Frequent switch too many times. Starting voltage is too high or preheat time is wrong, flash jump too many times. Ballast preheating current is too large. Starting voltage too high or insufficient preheat time electronic ballasts. 5. Black like annular coil tubes after long-term use of uv sterilizer, metal halide lamp, filament with a circle around the black ring, this is because every time the lamps, the heavy ions generated by the cathode, also failed to timely with electronic towards the anode, the cause is deposited on the wall, this is a natural phenomenon, has nothing to do with the lamp life and photosynthetic efficiency. 6. Caused the wall color change in the process of production, if the heating oven and exhaust vacuum technology not perfect, will the residual hydrogen, it will also combine with mercury and metamorphism, pollution of the fluorescent powder, if the new bulbs that occurs, it is bad tubes - ( Yellow black) 。 Other tubes soda-lime glass or high lead glass contain a large amount of sodium, in the process of lamps, sodium will precipitate out of the glass tube, combined with mercury, and become sodium amalgam, deposit on the fluorescent powder layer, fluorescent powder metamorphism. To sum up, uv disinfector lamp black for many reasons, but mostly will not affect the normal use lamp.
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