How to use ultraviolet germicidal lamp

Ultraviolet is low-energy electromagnetic radiation, which has strong bactericidal power at the wavelength of 240 ~ 280 nm and is used for air disinfection. Install a 30-watt lamp every 10 ~ 15 square meter, the lamp is about 2.5 meters away from the ground, and each irradiation is not less than 30 minutes; Used for surface disinfection, the direct irradiation distance between the lamp and the disinfected object is not more than 1 m, and the time is more than 30 minutes; The thickness of that wat layer use for disinfection of drinking water is less than 2cm, and the ambient temperature is controlled at 20-40 DEG C and the humidity is control at 40-60% during disinfection. It should be opened and used unattended, and the intensity of the lamp should be monitored once every six months. The new lamp should be no less than 100μw/cm2 and no less than 70μw/cm2. If the service time is1000h, the lamp should be replaced or calibrated according to the calibration requirements in the product manual.

Details are as follows:

The spectral line of ultraviolet germicidal lamp is 254 nm. 254 nm ultraviolet germicidal lamp kills bacteria by irradiating the DNA of microorganisms. The use of ultraviolet germicidal lamp is related to the radiation space range of ultraviolet germicidal lamp, the hanging distance of ultraviolet germicidal lamp and the wiping and cleaning of ultraviolet germicidal lamp.

A, ultraviolet germicidal lamp radiation space range:

Many users of ultraviolet germicidal lamps ignore the effective spatial range of ultraviolet irradiation and only consider and calculate the plane area of irradiation. In addition to the area factor, the height of each disinfection space is high or low, and the total space range is large or small. When using germicidal lamp, the total space cube should be calculated. The effective sterilization space of 30w ultraviolet germicidal lamp should be less than 30m3. It is generally believed that the power of ultraviolet germicidal lamp per cubic meter should be greater than 65438.

Second, the ultraviolet germicidal lamp hanging distance:

When using the ultraviolet germicidal lamp, attention should be paid to the irradiation distance between the sterilized object and the ultraviolet germicidal lamp, that is, the hanging height of the ultraviolet germicidal lamp should be less than 2.5 meters, and the hanging height of some users' ultraviolet germicidal lamps should be more than 2.5 meters, or even more than 3 or 4 meters. The irradiation intensity of ultraviolet rays is almost inversely proportional to the irradiation distance, and the hanging height is too high, which will inevitably affect the sterilization effect.

Third, the decline in the intensity of ultraviolet radiation:

With the extension of use time, the radiation intensity of ultraviolet germicidal lamp will gradually decrease. According to many tests, the ultraviolet germicidal lamp needs to be replaced after 5000 hours of use. The service life of ultraviolet germicidal lamps imported from abroad and light sources imported from the United States can reach more than 12000 hours, so it is necessary to replace the ultraviolet germicidal lamps.

Four, should also pay attention to the application of ultraviolet germicidal lamp cleaning and cleaning:

When using the new ultraviolet germicidal lamp, you can first wipe the lamp with 95% alcohol gauze to eliminate the dust and oil pollution on the lamp. During use, the ultraviolet lamp tube should be wiped regularly (once a week) to avoid affecting the ultraviolet transmittance and radiation intensity.

Finally, when using ultraviolet germicidal lamp, we should also pay attention to the prevention of ultraviolet rays: mainly to prevent ultraviolet rays from harming eyes and face, especially conjunctiva. After the face is injured by radiation, the eyes are red, swollen, tearful and stinging, which is more serious than the lightning eye injury. It will take three or four days to recover. (In case the conjunctiva is damaged by ultraviolet rays, eye drops of human milk can be used once every half hour, and the effect is better three or four times). Precautions: Avoid facing the light source directly. When monitoring the radiation intensity of ultraviolet germicidal lamp, use special radiation intensity or sunglasses as protective masks and goggles, but never use timely glass as protective articles, because the ultraviolet transmittance of timely glass is above 80%, while ordinary glass is almost ultraviolet.