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UV Lamps tube common little knowledge

UV Lamps tube common little knowledge

2020-09-03

During the COVID-19 epidemic, UV Lamps are a common method of disinfection and the following will be the Tepro UV Lamps supplier to provide some tips for the UV Lamps.

Common sense of UV lamp tube


1. Origin of ULTRAVIOLET air disinfection

 

The early study of air disinfection began in the 1920s. It was first used in hospital operating rooms in 1936, and in schools for the first time in 1937.

 

2. Principle of UV lamp disinfection

 

Uv lamp is a type of low-pressure mercury lamp that USES ultraviolet radiation from the intensified low-pressure (<10-2Pa) mercury vapor to disinfect the lamp. The main spectral lines of ultraviolet disinfection lamps are 253.7nm and 185nm, and the peak wavelength is 253.7nm. The ultraviolet rays of these two wavelengths can play a good bactericidal effect. The former can directly act on the genetic material of biological cells, namely DNA, which will be destroyed and lead to bacterial death, and have the function of breaking down ozone. The latter, by interacting with oxygen in the air, produces strong oxidizing ozone, which kills bacteria.

 

3. Precautions for using UV lamps

 

I. Method of use

 

(1) Object surface disinfection

 

Irradiation mode: the best method is mobile proximity irradiation, also can be suspended type irradiation, small items can be placed in the ultraviolet disinfection box irradiation. The distance between the sterilized articles and the lamp tube is easy to be within 1 meter, and the surface of the articles must be directly irradiated. The surface of the paper and fabric with rough surface should be properly extended for irradiation time, and both sides should be irradiated.

 

(2) indoor air disinfection

 

Direct or indirect illumination can be used. The use of mobile or direct illuminate suspension type ultraviolet lamp, under the condition of no implementation, indoor installation of ultraviolet lamp is > 1.5 W/m3, the number of tubes within 2 meters above the ground, irradiation time 30 minutes or more, the latter using high intensity ultraviolet air disinfector, disinfection effect, reliable and can be used in indoor when someone, need to boot up 30 minutes or more.

 

Ii. Matters needing attention

 

(I) The effective disinfection time of ultraviolet lamp tube is 1000h, and the effective disinfection time of high-intensity ultraviolet air sterilizer is 1500h, which should be replaced on time;

 

(II) During the use, keep the light surface clean, wipe it with 75% ethanol cotton ball once a week, and wipe it at any time when there is dust or oil on the surface of the light tube.

 

(3) The disinfection room should be clean and dry, the temperature should be between 20 ℃ and 40℃, the relative humidity should be less than 80%, if exceeding this range, the irradiation time should be extended;

 

(4) Intensity of ultraviolet radiation. It should be tested every six months. If it is lower than 70uW/cm2, it should be replaced at any time.

 

(5) The ultraviolet ray shall not be directly irradiated to the person, so as not to cause damage.

 

(6) Keep a record of the date of disinfection, the exposure time, the accumulated time of using the lamp and the time of changing, and the bacterial culture and results of the disinfection articles at any time.

UV lamp 

Why does the UV lamp tube turn black?

 

In the process that USES ultraviolet ray sterilizer, can encounter the following similar circumstance sometimes, ultraviolet ray lamp tube is in before use very normal, but after use partial however blackened. Is there a quality problem with the lamp? Or was it a mistake? Why can ultraviolet lamp tube blacken? Will the bactericidal efficiency be affected after blackening?

 

1. The new UV lamp tube is black and contains sundries.

 

Ultraviolet light tubes commonly used in ultraviolet sterilizers are made from mercury vapor pressure mixed with a variety of other metals into a vacuum glass chamber. The tube contains an indispensable element: mercury, before the mercury has not completely evaporated, its shape is in the form of particles in the tube. Other metals can also stick to the wall like dirt, and in some transparent tubes, they can be particularly clear. But don't worry, it's generally normal.

 

2. Black out when you start using it

 

Uv sterilizer New tubes or some long unused tubes, but once the lamp is lit, there will be a mass of black gas in the filament area, is this bad rhythm?

 

Of course not, the black gas is actually mercury vapor, the mercury around the filament gathered in the heat began to evaporate, and along the wall of the tube volatilized, the color of more and more faint, and finally disappeared.

 

Of course, not every tube is like this, because not every tube of mercury is exactly concentrated around the filament, this is the new lamp unique normal phenomenon.

 

3. The lamp goes black after the lights are out

 

When the UV sterilizer lamp goes out, the mercury condenses as it cools, and has the property of concentrating at the coldest end of the tube. Therefore in the lamp tube the coldest place, or close to the air conditioning place, often has the mercury repeated evaporation condenses and leaves the mercury pollution trace, this is the normal phenomenon

 

4. Black spots on the cold end

 

Ultraviolet sterilizer lamp tube in the short term after use, often can see the filament edge has a black spot, and will be longer and larger as the use of time. The reason is that the lamp tube is getting smaller and smaller, the power is getting larger and larger, the filament is getting longer and longer, and the filament electrode is getting closer and closer to the tube wall. In each preheating of the lamp, if the amount of ion bombardment is too large, it is easy to adhere to the tube wall and cause the black spot. The reasons are as follows:

 

The error of power supply is too big during use.

 

Too many frequent switches.

 

The starting voltage is too high or the preheating time is wrong, and the number of flashover is too much.

 

The ballast preheating current is too high.

 

Too high starting voltage or insufficient preheating time of electronic ballast.

 

5. Black as a ring

 

After the ultraviolet sterilizer lamp tube has been used for a long time, there is a black ring around the filament of the metal halide bulb. This is because every time the lamp is lit, the ions generated by the cathode are relatively heavy, and the cathode has not been able to run to the anode in time with the electrons, resulting in deposition on the tube wall, which is a natural phenomenon, and has nothing to do with the tube life and light effect.

 

6. Discoloration of pipe walls

 

In the production process, if the heating and baking and exhaust vacuum and other processes are not perfect, will remain hydrogen elements, this will also be combined with mercury and metamorphism, pollution fluorescent lamp powder, if the new tube that occurs, it is a bad tube -(yellow and black). In addition, the sodium calcium glass or high lead glass of the lamp contains a lot of sodium elements. In the process of lighting, sodium will be precipitated from the glass tube and combined with mercury to become sodium amalgam, deposited in the fluorescent lamp powder layer, resulting in the deterioration of the fluorescent lamp powder.

 

To sum up, there are many reasons for the uv sterilizer lamp to become black, but most of them will not affect the normal use of the UV lamp.


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