lamps can be classified into gas discharge light sources and solid light sources from the classification of electric light sources. These two light sources are our common low-pressure mercury ultraviolet disinfection lamps
and LED ultraviolet disinfection lamps. Since the electric power conversion of low-pressure mercury ultraviolet lamps is much better than that of LED ultraviolet disinfection lamps lamps, the current UVC ultraviolet disinfection lamps are still mainly low-pressure mercury ultraviolet lamps. Today, UV lamp manufacturers are talking to everyone about the classification and technical characteristics of low-pressure mercury UV disinfection lamps. Classification of low-pressure mercury lamp ultraviolet disinfection lamps Common low-pressure mercury ultraviolet disinfection lamps lamps can be divided into high boron glass materials and quartz glass materials according to the material of the lamp tube. Because the low-pressure mercury uv lamp
made of quartz glass far exceeds the ultraviolet disinfection lamp made of high boron glass in terms of heat generation and ultraviolet light transmittance. Therefore, the low-pressure mercury ultraviolet disinfection lamps described in this article are all examples of disinfection lamps made of quartz glass. According to the difference of mercury vapor pressure in the ultraviolet lamp tube during normal operation and the difference of ultraviolet output intensity, it is divided into: low-pressure low-intensity mercury lamp, medium-pressure high-intensity mercury lamp and low-pressure high-intensity mercury lamp. The low-pressure mercury vapor can release two ultraviolet rays of 254nm and 185nm, using transparent violet glass or quartz glass to transmit the ultraviolet rays through the lamp tube. Ultraviolet rays with a wavelength of 254nm can be absorbed by microbial cells, causing damage to the cell's genetic material DNA and the death of microbes. The 185nm ultraviolet rays react with oxygen in the air to produce ozone with strong oxidizing effect, which can effectively kill bacteria. The dispersibility of ozone can just make up for the shortcomings of ultraviolet rays that only spread in a straight line and there are dead spots in disinfection. Low-pressure mercury ultraviolet disinfection lamps can be divided into ozone-type ultraviolet disinfection lamps and ozone-free ultraviolet disinfection lamps according to whether they contain ozone. Under normal circumstances, the low-pressure mercury ultraviolet lamp will produce two ultraviolet rays of 254nm and 185nm. The low-pressure mercury ultraviolet disinfection lamp made of quartz glass can shield the ultraviolet rays below 200nm by adding a sufficient amount of titanium to obtain ultraviolet rays with a wavelength of only 254nm. This is an ozone-free ultraviolet disinfection lamp. It can also be seen from the above that the ozone and ozone-free ultraviolet disinfection lamps can be manufactured by controlling the titanium element. Technical characteristics of low-pressure mercury UVC uv lamp 1. The effective life of the hot cathode is 8000 hours, and the cold cathode is more than 20000 hours. 2. Use high-quality quartz glass tube with hydroxyl content less than or equal to 50ppm and ultraviolet transmittance greater than or equal to 98%. 3. The use of zirconium aluminum sheet to absorb impurities in the tube greatly prolongs the service life of the low-pressure mercury lamp. 4. The mercury content is less than 3.5mg/root. Ultra-low mercury technology strictly abides by the Minamata Treaty and can be used with confidence. Low-pressure mercury ultraviolet disinfection lamps currently have technical problems. 1. The cost is high and the manufacturing process is more complicated. The characteristics of the quartz glass material determine that it cannot be mass-produced, hindering its further popularization and application. 2. Great light decay. Quartz glass low-pressure mercury UV lamps have a UV light decay of up to 30% when used for hundreds of hours. In addition, the complexity of the production process makes it difficult to avoid cathode damage during processing, and also affects the life of the ultraviolet disinfection lamps lamp.
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