Ultraviolet lamp sterilization range, ultraviolet lamp disinfection range

1. Ultraviolet lamp.

It is used for indoor air and disinfection of surfaces and water and other liquids.

2. Ultraviolet lamp is a device that can emit ultraviolet rays, which is a necessary tool for observing the fluorescence and phosphorescence characteristics of samples, and is also a physical means for sterilization and disinfection. The wavelength is in the range of 10 400nm.

3. Related lamps include strong ultraviolet high-pressure mercury lamps, high-intensity metal halide lamps, plate lamps, capillary ultra-high pressure mercury lamps, light cleaning lamps, disc special lamps, ultraviolet iron lamps, sterilization and disinfection lamps, and short-arc xenon lamps.

Excimer discharge lamp.

Ultraviolet lamp sterilization range: under normal circumstances, ultraviolet germicidal lamps should be hung in a high place, that is, direct irradiation is effective within the sterilization range, then according to the general indoor height (about 3 meters, the workshop is generally 4---5 meters), a "straight tube" (and ordinary fluorescent lamp lamp stand) ultraviolet germicidal lamp, if its power is 40w, every 15 square meters of area should be enough to install one, the sterilization time is generally about 30 minutes, Moreover, when the UV lamp is used, the human body should not be irradiated (that is, it should be done when the workshop is unoccupied).

Ultraviolet rays are effective against our common viruses and bacteria, such as influenza virus, mites, anthracite maggot, Escherichia coli, hepatitis B virus, dysentery bacillus, etc. In addition, studies have proven that ultraviolet light also has a role against coronaviruses.

Effective distance 2 meters. The number of UV lamps in the room is greater than the number of watt cubic meters. That is, every 20 cubic meters of room should have at least one 30-watt UV lamp.

The germicidal lamp does not need to be converted into visible light, and the wavelength of 250nm-260m can play a good bactericidal effect, and this wavelength range can destroy its chromosomes and play a photochemical role.

The only sources that can output sufficient UVC intensity for engineering disinfection are artificial mercury (alloy) light sources. Ultraviolet germicidal lamps are made of quartz glass, and mercury lamps are divided into three types according to the different mercury vapor pressure and ultraviolet output intensity in the lit lamp: low-pressure low-intensity mercury lamp, medium-pressure high-intensity mercury lamp and low-pressure high-intensity mercury lamp.

The sterilization effect is determined by the dose of irradiation received by the microorganisms, and 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 time of use, and it will lose 30%-50% of its intensity as the lamp ages. Ultraviolet irradiation dose refers to the amount of ultraviolet rays of a specific wavelength required to achieve a certain bacterial inactivation rate: irradiation dose (J m2) = irradiation time (s) UVC intensity (W m2) The larger the irradiation dose, the higher the disinfection efficiency, due to the size of the equipment, the general irradiation time is only a few seconds, therefore, the UVC output intensity of the lamp has become the most important parameter to measure the performance of ultraviolet disinfection equipment.

In urban sewage disinfection, the average irradiation dose is generally more than 300 J m2. Below this value, there is a possibility of photoresurrection, that is, the germ cannot be completely killed, and when it flows out of the channel and receives visible light, it will be resurrected, reducing the sterilization effect. The higher the sterilization efficiency requirements, the greater the amount of irradiation required.

The main factor affecting the adequate dose of UV light received by microorganisms is the light transmittance (at 254 nm), when the UVC output intensity and irradiation time are constant, the change of light transmittance will cause the change of the actual dose received by microorganisms.

Most of the ultraviolet devices use traditional low-pressure ultraviolet lamp technology, and some large water plants use low-pressure high-intensity UV lamp system and medium-voltage high-intensity UV lamp system, due to the production of high-intensity ultraviolet rays may reduce the number of lamps by more than 90%, thereby reducing the footprint, saving installation and maintenance costs, and making the UV disinfection method suitable for poor water quality effluent.

The disinfection range is around the UV lamp.

UV lamps are used for indoor air and disinfection of surfaces as well as water and other liquids. Ultraviolet lamps are the pathogenic microorganisms.

Eradicate the external environment, cut off the transmission route of infectious diseases, block the spread of infectious diseases, and achieve the purpose of protecting human health. Ultraviolet disinfection lamps.

It is mainly used for air disinfection of empty branches and spikes.

Disinfection with ultraviolet lamps.

Principle: ultraviolet lamp, also known as ultraviolet disinfection lamp, ultraviolet lamp uses the ultraviolet light emitted by mercury lamp to achieve sterilization and disinfection function, ultraviolet disinfection technology has incomparable sterilization efficiency of other technologies, and the sterilization efficiency can reach 99%. The Science of UV Disinfection:

It mainly acts on the DNA of microorganisms and destroys the DNA structure.

The line emitted from the inner surface is a C wave, and its wavelength ranges from 200 to 270 nm, and the center wavelength of sterilization is . at ultraviolet intensity.

and when the irradiation time is sufficient, it can kill all microorganisms.

However, ultraviolet rays are extremely penetrating, their intensity is inversely proportional to the square of the distance, and they only have a germicidal effect on the surface they are hit.

At present, there are mainly these types of production in China: the power is 15W, 20W, 30W, 40W, and we currently use a maximum of 30W ultraviolet lamps, and the requirements are per cubic meter of area.

External radiometer assay.

Ultraviolet intensity irradiation indicator card monitoring method.

Ultraviolet radiometer measurement method: after turning on the ultraviolet rays for 5min, the ultraviolet radiometer probe of the measured wavelength is placed at the vertical distance of 1m under the lamp.

Ultraviolet intensity irradiation indicator card monitoring method: after turning on the ultraviolet lamp for 5min, the indicator card is placed at a vertical distance of 1m under the ultraviolet lamp, with the pattern side facing up, irradiated for 1min (after ultraviolet irradiation, the photosensitive color block in the middle of the pattern changes from milky white to different degrees of light purple), observe the color of the indicator card color block, compare it with the standard color block, and read out the irradiation intensity.

The results were judged that the irradiation intensity of the new lamp was 90 W cm2 for the ordinary 30W straight tube Zheng Shouting ultraviolet lamp. The irradiation intensity of the ultraviolet lamp in use is 70 w cm2 is qualified; The irradiation intensity of 30W high-intensity ultraviolet new lamp 180 W cm2 is qualified.