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UV lamp standards

2020-07-22T02:42:28.386Z

UV dosimeter
In our country, 70uw/cm2 (1m place) UV lamps account for almost 50-80%. According to the requirements of the Ministry of Health's disinfection technical specifications, the pass rate is less than 50%. The irradiation intensity of some UV germicidal lamps used per unit is less than 70uw/cm2 (at 1m). Some even less than 40uw/cm2 are still in use.

In fact, each kind of microorganism has its specific ultraviolet kill dose threshold. The bactericidal dose (K) is the product of the irradiation intensity (I) and the irradiation time (t), K=It. It can be seen from the formula that high-intensity short-time or low-intensity long-term irradiation can obtain the same sterilization effect. However, if the UV intensity is less than 40uw/cm2, the longer the irradiation time will not be able to achieve a satisfactory sterilization effect, because there is a problem of microbial damage repair in the middle, and the irradiation intensity is deliberately increased.

As the use time of the ultraviolet germicidal lamp is extended, the radiation intensity will gradually decline. After multiple measurements, the decay rate of quartz lamps is less than 20% after 1000 hours of use, while the decay power of high-boron lamps is more than 30% after 200 hours of use, plus the radiation intensity of the high-boron lamps itself is less than 70uw/cm2 Therefore, quartz ultraviolet germicidal lamps should be used in use.

The monitoring of the radiation intensity of ultraviolet germicidal lamps is a vital task in the application of ultraviolet disinfection. The management personnel of the user unit should test the ultraviolet germicidal lamps in use, and the ultraviolet intensity should be tested in three to six months. The instrument performs an intensity test. The health and epidemic prevention monitoring department should monitor the intensity of units using ultraviolet germicidal lamps every six months, and replace the lamps with insufficient intensity in time.

The UV dosimeter should be calibrated once a year to ensure its accurate performance. When testing the radiation intensity, it must be monitored in accordance with the technical specifications of the Ministry of Health, the voltage is 220V, the temperature is 20 degrees Celsius, and the RH<60% is used for monitoring. When the intensity tester is turned on for five minutes, the tested value after the intensity is stable is the irradiation intensity of the ultraviolet germicidal lamp.

Principle of ultraviolet lamp killing new coronavirus

2020-07-14T02:24:43.728Z

The principle of ultraviolet lamp killing new coronavirus
The new coronavirus is an RNA virus with a corona shape. The main substance of the new coronavirus is protein, and its uneven surface is regularly arranged. We use an ultraviolet lamp to penetrate the surface of the new coronavirus and penetrate inside to destroy different types of nitrogenous bases in nucleic acids.
There are two types of UV lamps that are more effective for new coronaviruses: 1. UV-C type UV sterilization lamp with a wavelength of 253.7 nm 2. Ozone UV lamp with a wavelength of 185 nm. They have the characteristics of high efficiency and high intensity of work, which can directly kill pathogens and prevent the spread of new coronavirus in the air and droplets. After a period of ultraviolet radiation, the permeability of the new coronavirus changes, and the cells exhibit growth or regenerative death.
Four, use UV dosimeter to detect the intensity of ultraviolet germicidal lamp .
The choice of ultraviolet germicidal lamp is mainly based on ultraviolet wavelength and ultraviolet intensity, and professionals will use ultraviolet radiation illuminance meter to detect. The ultraviolet radiation illuminance meter has a wide spectrum, is not easily interfered by other light rays and other rays, and has strong stability. In the actual measurement, no other protective equipment is required, and it has high safety.
To detect the intensity of the ultraviolet germicidal lamp with an ultraviolet radiation illuminance meter, it is necessary to ensure that the probe corresponds to the instrument one by one, and the ambient temperature cannot be too high or too wet. Correct and reasonable operation can ensure the authenticity of the data.

Classification of anti-corrosion coatings

2020-07-06T05:52:21.150Z

Many parts used in life need to be painted with anti-corrosion coating to protect the internal structure. The importance of this anti-corrosion coating is self-evident. This article mainly elaborates the importance of using coating thickness gauge to detect anti-corrosion coatings.
In order to protect the internal structure of the metal or keep the pipeline smooth and functioning normally, we will coat a layer of material on the surface for isolation protection. This is what we call an anti-corrosion coating. Its thickness and corrosion resistance have a very close relationship. Professionals will use a coating thickness gauge to measure.
1. The role and classification of anticorrosive coatings
In daily construction, the functions of anti-corrosion coatings are various. But the most important thing is to protect against wear. The anti-corrosion coating has protective and decorative effects.
Protection: Use surface coating to isolate oxygen, moisture, chemicals, impurities, etc. in the external environment to prevent the internal structure from being oxidized or abraded. In addition, it can also help the external pressure of the internal metal area. The anti-corrosion coating also has certain insulation properties, which can avoid conduction.
Decorative effect: The decorative effect of the anticorrosive coating is inferior. We will paint the color of the surface of the anticorrosive layer according to the specific needs of the place decoration. The selection of paint will also judge the decorative effect.
The classification of anti-corrosion coatings is as follows:
No. Classification Standard Item
1 Substrate Epoxy anticorrosive coating
Scale anti-corrosion coating
Epoxy polyester hybrid
Outdoor pure polyester
2 Temperature Low temperature anti-corrosion coating
Normal temperature anti-corrosion coating
High temperature anti-corrosion coating
Second, the importance of applying a coating thickness gauge to detect anticorrosive coatings
The performance of the anti-corrosion coating is greatly related to its spraying process, spraying thickness and spraying material. When conducting product inspection, we will use a coating thickness gauge for inspection.
The importance of coating thickness gauges in the field of anti-corrosion coating testing is self-evident. Too thick anti-corrosion coating will cause waste of anti-corrosion materials, and the cost will be greatly increased. And after a period of use, the anti-corrosion coating will also crack and detach. This is not conducive to the optimal use of material and financial resources. Too thin anti-corrosion coating has poor protection performance and insufficient aesthetic effect, which can easily lead to metal wear and corrosion.

New coronavirus control and UV light tester

2020-07-02T02:14:46.347Z

New coronavirus control and UV light testerAbstract: Under the ravages of new coronaviruses, the irradiation of ultraviolet germicidal lamps can effectively control the virus, but the use of germicidal lamps is inseparable from the ultraviolet intensity detector.During the Lunar New Year in 2020, the outbreak of new coronavirus in my country put the whole country into a high alert state, and government departments also issued a request to the public not to gather multiple people to avoid the continued spread of new coronavirus. During this period, places of entertainment, cinemas, temples, restaurants and other places in the country where people can gather are all closed. Even if the public needs to wear masks on the street due to their daily needs, it is conceivable that the spread of the new coronavirus is How strong is it. Use ultraviolet germicidal lamp to eliminate new coronavirus In a hospital with a large number of people every day, the new coronavirus may have become a hiding place here. The patients diagnosed every day are inside, and the patients who have fever are waiting to be diagnosed. Even if the patients are removed, there are many new coronaviruses on the protective clothing of the doctors and nurses who care for the patients. Even if it does not directly infect healthy people, the new coronavirus will survive in the air for several hours, and it is prone to secondary transmission. Therefore, the ultraviolet sterilization lamp is a sterilization tool that the hospital needs at this stage. Speaking of ultraviolet germicidal lamps, it is actually a low-pressure mercury lamp, which uses low-pressure mercury vapor to be excited to emit ultraviolet rays to kill viruses. The ultraviolet rays that are stimulated cannot be seen by the naked eye. Ultraviolet germicidal lamps also have two wavelengths of ultraviolet light. Generally, ultraviolet light with a wavelength of 253.7nm is used to cause the cross-linking of nucleic acids and proteins to rupture the virus, so that the nucleic acid loses biological activity and causes the death of the virus. The ultraviolet sterilization lamp with a wavelength of 185nm will react to release ozone for sterilization, which is called ozone lamp. However, it is necessary to know whether the ultraviolet sterilization lamp can effectively kill the new coronavirus in the hospital. It is necessary to use an UV light tester to detect the ultraviolet intensity of the sterilization lamp. As long as the intensity reaches the standard, it will continue to effectively kill the new coronavirus.

UV sterilization requirements

2020-07-01T05:45:35.771Z

Since the germicidal lamp has been used for a long time, the light source will occur, so it is necessary to regularly detect the intensity of the germicidal lamp. The 254nm UV irradiator is specially designed to detect the intensity of germicidal lamps. Linshang UV light intensity meter can be used to measure the ultraviolet irradiation intensity of the UV lamp. There are regulations for the detection of germicidal lamps:
WS/T 367-2012 "Technical Specifications for Disinfection of Institutions" P15, Appendix A.3 Monitoring of the effect of ultraviolet disinfection.The 2009 version of "*** Disinfection Technical Specification" P9, 2.3 UV disinfection.Ultraviolet germicidal lamp GB19258-2003 P4, rated value of ultraviolet radiation illuminance.
The above standards specify the following:1. Only 5 minutes after turning on the UV lamp, the UV intensity of the lamp can be measured more stably.2. The instrument is placed 1m vertically under the UV lamp tube for measurement.3. The new ordinary 30W straight tube type ultraviolet lamp, the irradiation intensity is greater than 100uW/cm2 is qualified.4. The irradiation intensity of the ultraviolet lamp in use must be greater than 70uW/cm2.5. The peak wavelength of the ultraviolet sterilization lamp is 253.7nm, and the ultraviolet lamp of this wavelength (UVC) has the sterilization function.6. Different power UV lamps have different irradiation ratings.

Fireproof paint thickness requirements

2020-06-30T08:34:46.581Z

GB14907-2002 "Fireproof Coatings for Steel Structures" stipulates that the thickness of fireproof coatings for thick steel structures is 7-45㎜. In the construction process of steel structure fire retardant paint, there is no clear regulation on the thickness of fire retardant paint, only the thickness required to reach the paint is proposed. Due to differences in the hazard levels of public buildings, important public buildings need to be strengthened and protected. Therefore, the choice of fire retardant coating thickness is very important. Under the premise of ensuring building safety, how to use fire retardant coatings efficiently and economically is very important. Is the thicker the fire retardant coating, the better the fire performance?
It is important to know that as the thickness of the fireproof coating increases, the temperature of the steel column surface continues to decrease, but the temperature decreases by a different degree. When the thickness of the fireproof coating is small, increasing the thickness of the fireproof coating can effectively reduce the temperature of the steel column surface. When the thickness reaches 25mm, as the thickness of the fireproof coating increases, the decrease in temperature of the surface of the steel column gradually decreases. Considering that the fire retardant coating is too thick, it is easy to fall off and crack due to various factors. At the same time, considering economic reasons, when the thickness of the fire retardant coating exceeds 25㎜, it is not appropriate to continue to increase the thickness of the fire retardant coating to increase the fire resistance of the steel structure. Appropriate use of other protection methods to achieve the best fire protection plan. Coating thickness gauge can be used to measure the fireproof coating thickness.
It can be seen that the protective effect of fire retardant coatings on steel structure buildings gradually decreases as the thickness of fire retardant coatings increases, and the fire retardant coatings are likely to fall off due to environmental factors afterwards, so it cannot mean that the steel structure buildings are realized by increasing the thickness of fire retardant coatings. Safety under fire. In addition, the thermal conductivity of the fire retardant coating has a greater influence on the temperature of the internal steel structure. For buildings with greater fire risk, it is advisable to use a fire retardant coating with a lower thermal conductivity instead of increasing the thickness of the fire retardant coating to achieve the fire resistance required by the building structure. limit.

Matters needing attention in coating measurement

2020-06-23T05:37:23.214Z

Matters needing attention in coating measurement:
1. During the test, it should be noted that the metal magnetism and surface roughness of the standard sheet should be similar to the test piece. 2. During the measurement, the probe is perpendicular to the surface of the measured object. 3. Pay attention to the critical value of the metal on the surface of the measured object when measuring. 4. Pay attention to the curvature of the base when measuring. 5. Remove all magnetic objects around before measuring. If there are objects around, a magnetic plant can be generated. If it will interfere with the magnetic thickness measurement method. 6. Be careful not to measure corners during measurement. 7. Also, keep the pressure constant during measurement, otherwise it will affect the measured reading. 8. Keep the probe of the paint thickness gauge in direct contact with the measured object when performing the test.

What is glossmeter?

2020-06-22T03:05:27.868Z

Gloss meter, also called glossmeter, is an instrument for measuring the surface gloss of ceramics, paints, inks, plastics, marble, aluminum, hardware and other materials. High-precision gloss meter is divided into three types of high gloss, medium gloss and low gloss according to angle.
Chinese name Glossmeter, foreign name Glossmeter, also known as Glossmeter, used to determine the principle of ceramics and paintFirst: Glossiness is a physical quantity that evaluates the ability of a material's surface to reflect light under a set of geometrically specified conditions, and has the reflective properties of direction selection. We usually say gloss refers to "mirror gloss", so the gloss meter is sometimes called "mirror gloss meter". Gloss is completely different from the concept of "smoothness" or "roughness" in the machining industry, which is the continuation of the small unevenness of the material surface.Second: The measuring principle of the gloss meter is shown in the figure below. The measuring head of the instrument is composed of an emitter and a receiver. The emitter is composed of an incandescent light source and a group of lenses, which produce a certain required incident beam. The receiver consists of a lens and a photosensitive element, which are used to receive the cone beam reflected from the sample surface.Mirror gloss is a relative measure of mirror gloss. The reference standard is black glass with a refractive index np=1.567. Assuming that its plane is ideally polished, the plane reflects the natural light beam specularly and defines the gloss value at this time as 100.0 gloss units. The gloss board is divided into high, medium and low according to the gloss value. The high gloss plate is made of black optical glass or other materials. Medium gloss and low gloss boards are made of glazed ceramic or black optical glass frosted. The gloss meter uses the principle of light reflection to measure the gloss of the sample. That is, the sample is irradiated under the conditions of a predetermined incident angle and a predetermined light beam to obtain the reflected light of the mirror in the direction of the reflection angle.The wave theory can be used to qualitatively explain many optical properties of materials. It can be derived from the wave theory that the ratio of the energy W of incident light passing through a unit area per unit time to the energy flow W of reflected light per unit time.

What is UV curing and UV energy tester

2020-06-19T02:52:59.227Z

1. The basic concept of UV curingUV curing means that people use ultraviolet light to convert small molecular substances, which can irreversibly convert small molecular substances into large molecular substances, and enhance the overall quality of the product. With the development of technology, UV curing technology has been vigorously developed and used in the fields of coatings, inks, glues, etc., further enhancing the competitiveness of products in the industry.UV curing can make the manufacturing process more skillful, and the product drying speed is improved. Cost consumption is also relatively low, not only safe and hygienic in operation, but also very efficient.2. Basic knowledge of pigment color curingThe development speed of our modern paper printing technology is quite rapid, and people are no longer limited to the traditional "white paper and black characters". Pigment color curing technology is an emerging process. Because the color of the pigment is closely related to its curing speed, we often choose the UV energy light source according to different hue.Generally speaking, the faster the curing speed of the pigment color, the lower the required UV energy value. The opposite is also true. But the color of the pigment is not directly related to the speed at which the pigment dries.3. How to choose UV energy meter correctlyIt should be noted that the choice of UV energy meter should do homework in advance, and can not be used blindly causing the situation that the light source does not match the instrument. The first thing to determine is the light source to be tested next. We understand that different light sources have different bands. The light sources measured by different UV energy meters are also very different.
Linshang Technology's LS130 mercury lamp special UV energy tester is suitable for the lamp tube inside the curing furnace. It can accurately measure the UV energy value, and also shows the stable performance of the lamp tube and the specific values of power and temperature. And another LED dedicated UV energy meter LS131 can measure the LED ultraviolet curing lamp, it has a wide band span, which is about 340nm-420nm.LS131 UV energy tester is a professional instrument for UV LED light source detection. The UV energy meter can detect the power and energy value of UV light source. The UV radiometer puck has wide spectral response and can test UV LED light sources in various bands such as 365nm, 375nm, 385nm, 395nm, 405nm. It is widely used in UV exposure, UV curing, UV flat printing, optical communications and other industries.

UV energy tester for UV LED

2020-06-17T08:00:25.163Z

In the ultraviolet curing industry, there are two types of curing light sources: high-pressure mercury lamps and ultraviolet LED lamps. The familiar UV energy tester may be the German brand and the US EIT. Not to mention how expensive the imported branded instruments are, but it is difficult for us to find genuine imported ones in China. As a manufacturer of UV energy testers, Linshang Technology, under such a strong brand effect, why should we develop a UV energy tester dedicated to detecting high-pressure mercury lamps and UV LEDs? This is because we pursue scientific data. At present, the UV energy testers on the market are all developed with high-pressure mercury lamps as standard light sources, but the high-pressure mercury lamps are included from 200nm to more than 1000 nanometers, but the 365nm band is only used for curing. The UV LEDs used for curing have different wavelength bands such as 365nm, 375nm, 385nm, 395nm, and 405nm, so it is unscientific to use a high-pressure mercury lamp light source as a standard UV energy tester to measure the UV LED data.UV energy tester for UV LED

The UV energy tester LS128 supplied by Linshang has a spectral range from 340nm-420nm. The spectral concentration can measure any kind of ultraviolet curing light source from 365nm-405nm. The data is accurate and scientific. It is dedicated for measuring UV LEDs. In addition, LS128 has a large range of 20W, withstands high temperatures up to 125, can be put into 100 high temperature operation for more than ten minutes, without any impact. And the large LCD screen can display energy, intensity, temperature, time and curve display at the same time, and can be connected to a computer to print a test report. This is the only UV energy tester with these functions. With the rise of UV LED curing, it will definitely promote the development of Linshang UV energy tester LS128 in the market.