In this article, we explain the requirements for disinfection of the UV lamp, the scope of application of UV lamps, the use of UV lamps, the hazards of UV disinfection lamps, and the precautions for Ultraviolet disinfection lamps to provide you with methods and guidance for using Ultraviolet sterilization lamps.
Let’s dive right in now, and you can click on the question that interest you,
1 UV lamp disinfection requirements
- Disinfection of the use of ultraviolet C-wave ultraviolet, its wavelength range is 200 ~ 275 nm, the strongest sterilization effect of the band is 250 ~ 270 nm, disinfection of the UV light source must be able to produce irradiation value to meet national standards of germicidal UV lamps.
- Requirements for disinfection of the UV lamp in the voltage of 220V, ambient relative humidity of 60%, the temperature of 20 ℃, the radiation of 253.7 nm UV intensity shall not be less than 70 μ W / cm². Ordinary 30W straight tube UV lamps are measured at 1 meter from the lamp, special UV lamps are measured at the distance of use, and the UV intensity meter used must be calibrated.
- UV lamps gradually reduce their irradiation intensity in the course of use, so the intensity of disinfection UV should be measured regularly, and once it falls below the required intensity, it should be replaced in a timely manner.
- The service life of the UV disinfection lamp, that is, the intensity of the new lamp reduced to 70 μ W / cm² of time (power ≥ 30W) of the lamp or reduced to 70% of the original intensity of the new lamp (power < 30W) in time, should not be less than 1000h.
2 UV lamp scope of application
- UV can kill all kinds of microorganisms, including bacterial propagules, budding cells, branching bacteria, viruses, fungi, rickettsia and mycoplasma, etc. All surfaces contaminated by the above microorganisms, water, and air can be disinfected by UV.
- UV irradiation energy is low, penetrating power is weak, can only kill the direct irradiation to the microorganism, so the disinfection must be fully exposed to UV disinfection parts.
- UV disinfection of paper, fabric, and other rough surfaces, to extend the exposure time, and both sides should be irradiated.
- The most suitable temperature range for UV disinfection is 20 ~ 40 ℃, the temperature is too high or low will affect the disinfection effect, the disinfection time can be extended, for air disinfection, the relative humidity of the disinfection environment is less than 80% is good, otherwise, the exposure time should be extended.
- When using UV light to kill microorganisms protected by organic matter, the irradiation dose should be increased. Suspended particles in air and water can also impact the disinfection effect.
3 How to use the UV lamp
(A) the disinfection of the surface of the goods.
1, irradiation mode: the best use of portable ultraviolet disinfection lamp close mobile irradiation, can also take the UV lamp suspended irradiation. For small items can be placed in the UV disinfection box, irradiation.
2, irradiation dose and time: different types of microorganisms have different sensitivity to ultraviolet light, when using ultraviolet disinfection must use the irradiation dose to kill the target microorganism’s required irradiation dose.
(B) Disinfection of indoor air
1、 Indirect irradiation method: High-intensity UV air disinfector is preferred, which not only has a reliable disinfection effect, but also can be used when there are indoor activities, and generally can be turned on for 30 min to achieve disinfection.
2, direct irradiation method: in indoor unoccupied conditions, can take the UV lamp suspended or mobile direct irradiation.
(C) the disinfection of water and other liquids
Water irradiation or water irradiation can be used. When using the water irradiation method, the UV source should be equipped with a quartz glass protective cover, no matter what method is used, the thickness of the water layer should be less than 50px, and the water flow rate should be determined according to the intensity of the UV source. Disinfected water must meet national standards.
4 The hazards of UV disinfection lamps
Ultraviolet light has a strong killing power on bacteria, the human body also has a certain degree of harm, the human body is the most vulnerable part of the cornea of the eye, so at no time should not use the eyes directly on the lit lamp to avoid injury, in case you have to look, the application of ordinary glass (wearing glasses) or light-transmitting plastic sheet, as a protective mask. Never use quartz glass by mistake, because ordinary glass is almost completely impervious to ultraviolet light. Once injured, there is no need to panic, facial burns, a few days after the epidermis off, without medicine and healing. Eye injuries will be red, swollen, tearing, stinging, about three or four days to heal. In any case, it is still recommended to go to a doctor as soon as you encounter an injury.
(A) Injuries to the skin
1, leading to skin allergies: If the exposed skin is exposed to this type of UV radiation, it will damage the skin and cause redness, swelling, flaking, itching, pain, rashes, and other allergic symptoms.
2, lead to skin aging: skin is strong UV radiation, will appear aging, this is because UV radiation will cause the skin tension becomes poor, elasticity dissipation and sagging and another aging phenomenon. UVR will also destroy the collagen fibers in the skin tissue, making the skin appear wrinkles, a sagging phenomenon.
3, leading to skin tumors: UV disinfection lamp irradiation of strong ultraviolet radiation may lead to skin tumors, UV may affect the body’s regulatory immune response and induce skin cancer, resulting in melanoma, skin cancer, etc.
(B) The damage to the eyes
1, caused by electrophotographic ophthalmia: UV disinfection lamp damage to the cornea and conjunctival epithelium caused by inflammation, can also be called electrophotographic ophthalmia. Characterized by redness and swelling of the eyelids, conjunctival congestion, and edema, intense foreign body sensation and pain, symptoms include fear of light, tearing and inability to open the eyes and blurred vision during the onset.
2、Causing inflammation of conjunctiva: The damage to strong ultraviolet light to the cornea is huge, which can easily cause pain in the eyes and lead to inflammation of the cornea and conjunctiva.
3、Produce cataract: Strong UV rays cause the lens to become opaque, thus causing cataracts to occur.
4, lead to retinal lesions: strong UV light can easily cause retinal lesions, UV light containing UVA can penetrate deeply into the eye, directly to the deep part of the eye and cause retinal lesions.
5 Cautions
1, in the process of use, should keep the surface of the UV lamp clean, once a week with alcohol gauze wipe, found on the surface of the lamp dust, oil, should be wiped at any time.
2、 When disinfecting the surface with UV light, the irradiated surface should be directly irradiated by UV light and should reach a sufficient dose of irradiation.
3, ultraviolet intensity meter at least once a year to calibrate. The service life of the UV disinfection lamp should be not less than 1000h.
4, shall not make the ultraviolet light source irradiate people, so as not to cause injury.
5, the use of ultraviolet disinfection lamp disinfection of the room after, pay attention to immediately open the window ventilation.
6 UV intensity monitoring
A. When measuring, turn on the UV lamp for 5 minutes, wait for its stability, place the indicator card at 1 meter from the vertical side of the UV lamp, place the side with the pattern toward the lamp and irradiate for 1 minute. After the UV lamp irradiation, the UV-sensitive color block in the pattern changed from milky white to different shades of purplish red. Compared with the standard color block, you can measure whether the UV lamp irradiation intensity meets the requirements of use.
B. The new UV lamp test radiation intensity value ≥ 90μw/cm² for qualified. The old lamp in use, the radiation intensity value ≥ 70μw/cm², can continue to use, car irradiation intensity value <70μw/cm², should be replaced with a new lamp.
- The use of greater than 90μw/cm2 half-yearly monitoring
- Greater than 70μw/cm² is less than 90μw/cm² once a quarter to monitor.
- The cumulative use of 1000 hours to change whether to monitor the qualified are replaced with a new tube.
- The new tube needs to be monitored and qualified before use.
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