The tube of the uv germicidal lamp is made of quartz glass. The mercury lamp is divided into three types according to the mercury vapor pressure in the lamp tube after lighting and the difference of the ultraviolet output intensity: low-pressure low-intensity mercury lamp, medium-pressure high-intensity mercury Lamps and low-pressure high-intensity mercury lamps. The sterilization effect is determined by the radiation dose received by the microorganisms. At the same time, it is also affected by the output energy of ultraviolet rays, which is related to the type of lamp, light intensity and use time. As the lamp ages, it will lose 30%-50% of its intensity.

The sterilization principle of the uv sterilizer is to use the radiation intensity of the ultraviolet lamp tube, that is, the radiation intensity emitted by the ultraviolet germicidal lamp, which is inversely proportional to the distance of the irradiated disinfectant. When the irradiation intensity is constant, the longer the irradiated disinfectant stays and the closer it is to the germicidal lamp, the better the sterilization effect, and vice versa. It has powerful destructive power, which can make bacteria and viruses lose their viability and reproductive power, thereby destroying bacteria and viruses, and achieve the effect of disinfection and sterilization. Ultraviolet germicidal lamps should pay attention to the decline of the lamp's radiation intensity. After a period of use, we still use the concept of fluorescent lamps to evaluate the lamp, and judge the invisible light intensity by visually visible light intensity. This method is extremely prone to errors. Have an impact on the bactericidal effect.

Ultraviolet radiation dose refers to the amount of ultraviolet radiation with a specific wavelength when reaching a certain bacterial inactivation rate: radiation dose (J/m2) = radiation time (s) × UVC intensity (W/m2) The greater the radiation dose, the greater the disinfection efficiency Because of the equipment size requirements, the general irradiation time is only a few seconds. Therefore, the UVC output intensity of the lamp tube becomes the main parameter to measure the performance of the ultraviolet light disinfection equipment. In the disinfection of urban sewage, the average radiation dose is generally above 300 J/m2. Below this value, the phenomenon of light resurrection may occur, that is, the germs cannot be killed. When they flow out of the channel and receive visible light, they will be revived, reducing the sterilization effect.