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Ultraviolet disinfection requirements 

1, disinfection use of ultraviolet C wave ultraviolet radiation, its wavelength range is 200 ~ 275nm, the band with the strongest bactericidal effect is 250 ~ 270nm, disinfection with ultraviolet light source must be able to produce irradiation value to reach the national standard sterilization ultraviolet lamp.

2. It is required that the ultraviolet radiation intensity of 253.7nm shall not be less than 70 W/cm 2 when the voltage of the ultraviolet lamp used for disinfection is 220V, the environmental relative humidity is 60% and the temperature is 20 ℃.

The ordinary 30W straight tube ULTRAVIOLET lamp is measured at 1 meter away from the lamp tube, while the special ultraviolet lamp is measured at the service distance. The ultraviolet intensity measuring instrument used must be calibrated.

3, the ultraviolet lamp in the process of use its radiation intensity gradually reduced, so should often determine the intensity of disinfection ultraviolet ray, once dropped to the required intensity below, should be replaced in a timely manner.

4. The service life of the ultraviolet disinfection lamp, that is, the lamp whose intensity is reduced from the new lamp to 70 W/cm 2 for a time (power ≥30W), or reduced to 70% of the original intensity of the new lamp (power & LT;

30W) should be no less than 1000h.

Scope of application

1. Uv can kill all kinds of microorganisms, including bacterial propagators, germs, mycobacteria, fungi, rickettsia and mycoplasma, etc. Surface water and air polluted by the above-mentioned microorganisms can be disinfected by UV.

2, ultraviolet radiation energy is low, weak penetration, can only kill the direct irradiation of characteristic organisms, so disinfection must make the disinfection site fully exposed to ultraviolet.

3. When using ULTRAVIOLET radiation to disinfect rough surfaces such as paper and fabric, the irradiation time should be extended appropriately, and both sides should be exposed.

4. The most suitable temperature range for ultraviolet disinfection is 20~40 ℃, too high or too low temperature will affect the disinfection effect, and the disinfection time can be appropriately extended. When used for air disinfection, the relative humidity of the disinfection environment is less than 80%, otherwise the irradiation time should be appropriately extended.

5. When killing microorganisms protected by organic matter with ULTRAVIOLET light, the irradiation dose should be increased.

Suspended particulates in air and water can also affect the effectiveness of disinfection.