Effective distance not more than 2 meters, time 30-60 minutes (from the light on 5-7 minutes to start timing).
Precautions:
1, before irradiation, the sick room should be cleaned, so as not to affect the disinfection effect.
2, irradiation attention to protect the eyes and skin, should be well covered or wear goggles.
3, ultraviolet lamp to keep clean. Do not turn off the lamp immediately after the re-opening, to be slightly cold before using the lamp to avoid damage.
4, regular determination of the irradiation intensity or sterilization effect of ultraviolet lamp.
Expanded information:
Bactericidal Effect
Bactericidal effect is determined by the dose of irradiation received by microorganisms, and also by the output energy of the UV light, which is related to the type of lamp, the intensity of the light, and the time of use, and with the aging of the lamp, it will lose 30%-50% of its intensity.Ultraviolet irradiation dose is to achieve a certain bacterial inactivation rate, the need for a specific wavelength of ultraviolet radiation: irradiation dose (J/m2) = irradiation time (s) × UVC intensity (W/m2) the larger the irradiation dose, the higher the efficiency of disinfection, due to the size of the equipment requirements, the general irradiation time is only a few seconds, therefore, the UVC output intensity of the lamp became a measure of UV light > Disinfection Equipment Performance The most important parameter.
In urban wastewater disinfection, the average irradiation dose is generally above 300 J/m2. Below this value, there may be light revival phenomenon, that is, germs can not be completely killed, when outflow from the channel to receive visible light irradiation, re-animation, reducing the sterilization effect. The higher the sterilization efficiency requirements, the greater the required irradiation dose.
The main factor that affects the microorganisms to receive enough UV irradiation dose is the transmittance (254 nm), when the UVC output intensity and irradiation time is certain, the change of transmittance will result in the microorganisms to receive the dose of the actual change.
Baidu Encyclopedia - Ultraviolet Disinfection