Use Of Ultraviolet Sterilization Lamp
Jan 13, 2022
01
About UV
Ultraviolet (UV) is a kind of light wave invisible to the naked eye. It exists outside the ultraviolet end of the visible spectrum, so it is called ultraviolet. It can destroy the molecular structure of DNA (deoxyribonucleic acid) and RNA (ribonucleic acid) of microbial cells, cause the death of growing cells and / or regenerative cells, and achieve the effect of sterilization and disinfection, especially with the ultraviolet sterilization effect in the band of 200nm-280nm (UV-C).
⊙ ultraviolet in electromagnetic wave
During the SARS period, experts from the China Center for Disease Control and Prevention found that the use intensity was greater than 90 percent μ W/cm ² The coronavirus can be killed by UV-C band ultraviolet irradiation for more than 30 minutes.
Therefore, ultraviolet disinfection and disinfection combined with other protective measures can effectively prevent the epidemic of COVID-19.
02
Working principle of ultraviolet sterilization lamp
According to the definition of ultraviolet sterilization lamp (GB / T 19258-2012), ultraviolet sterilization lamp is a low-pressure mercury vapor discharge lamp using quartz glass or other UV transparent glass, and the discharge produces ultraviolet radiation with the peak wavelength of 253.7nm. 2019 ncov has no nucleus. Once it enters the human body, it will "hijack" our healthy cells to obtain the ability to replicate the virus. Ultraviolet light can effectively destroy its molecular structure, prevent its replication and achieve the effect of final killing.
⊙ 2019 ncov DNA and RNA molecular structure
In addition to 253.7 nm, the luminous spectrum of the ultraviolet sterilization lamp also includes 185 nm, which can change o Ω in the air into o З (ozone). Ozone itself has bactericidal effect, coupled with the heat when the germicidal lamp is converted to ultraviolet light when working, it can be described as "three pronged" for COVID-19.
⊙ ultraviolet light can lead to the breaking of nucleic acid bonds and chains
03
How to choose the suitable ultraviolet sterilization lamp?
Pay attention to the relationship between UV intensity and space size when purchasing UV germicidal lamps. According to the requirements of WS / t367-2012 technical specification for disinfection of medical institutions, UV germicidal lamps are suspended or mobile direct irradiation disinfection. The lifting height of lamp tubes is 1.8m to 2.2m from the ground, and the average number of UV germicidal lamps installed is Greater than or equal to 1.5w/m ³, That is, 1.5W UV sterilization lamp is required per cubic meter of space, and the number of lamps required in the space is: house area House height 1.5 ÷ 30 (calculated according to the lamp with purchased power of 30W), and the result is rounded.
For example, the area of a house is 20m ², If the height is 3M, the number of ultraviolet sterilization lamps required is:
20m ² 3m 1.5W ÷ 30W = 3 (PCs.)
That is, the house needs three 30W ultraviolet sterilization lamps.
⊙ common household ultraviolet sterilization lamp
It should be reminded that all ultraviolet lamps have a certain service life, and should be replaced in time. According to the requirements of GB / T 19258-2012, the service life of ultraviolet lamps should not be less than 5000h. However, due to the extremely weak penetration of ultraviolet rays in the air, the ultraviolet radiation intensity of the lamp tube will decay after long-time use, which is difficult to achieve long-distance sterilization effect. Therefore, it is necessary to be as close as possible to the position where sterilization is needed. For example, in the center of the room or where bacteria are easy to breed, it is better to be 1.5m-2m away from the surroundings.
04
Precautions for using ultraviolet sterilization lamp
1 when using ultraviolet sterilization lamp, remember to "leave the lamp and people away", and there must be no one in the room.
2. Ultraviolet rays have certain damage to human skin and mucous membrane. Pay attention to protection when using. If you need to work under ultraviolet light, you should strengthen personal protection. You can't look directly at the lit lamp with the naked eye to avoid burning.
3 when disinfecting articles with ultraviolet sterilization lamp, spread out or hang the articles to expand the irradiation surface. When the distance is not more than 1m, irradiate for 30 minutes.
4 the room shall be kept clean and dry. If the relative humidity is greater than 60 percent , the irradiation time shall be extended appropriately.
5 after using the ultraviolet sterilization lamp, remember to ventilate for 30 minutes before entering the room.
In short, ultraviolet sterilization lamps have good sterilization and disinfection effect, but they need to be used correctly. Products with excellent quality should be selected, and the installation and use methods should be understood in detail. Improper use will cause certain harm.
Whether ultraviolet sterilization meets the requirements of irradiance is related to whether it has the effect of sterilization and disinfection. Therefore, it needs to be guaranteed by professional measurement and testing. Only UV disinfection lamps meeting the technical standard can achieve the effect of sterilization and effectively prevent and control the spread of the COVID-19 epidemic.