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Color measurement steps of colorimeter

paintmetre — Mon, 14 Sep 2020 02:46:01 GMT

Color measurement steps of colorimeter:
Nowadays, the commonly used color measuring instrument in the coating field is the color difference meter (mainly divided into spectrophotometer and photoelectric integral color difference meter). The x, y and Y, namely the chromaticity coordinates and the brightness factor can be obtained by measuring the sample plate by the instrument. Through the chromaticity diagram, you can know the position of the measured color in the chromaticity diagram. In order to make the color space more in line with the color difference of visual observation, x, y, and Y are transformed into a*, b*, L* values through a series of conversions, where the a* value represents the red and green phase (positive value is red) , B* value represents yellow-blue phase (positive value is yellow), L* value represents brightness, namely black and white phase (0 is black, 100 is white). In this way, each color shows a set of corresponding a*, b*L* values, and two different colors show different a*, b*, L* values, so that Δa, Δb, and ΔL can be obtained. The difference between the chromaticity and the difference in lightness can be calculated as the total color difference between the two, expressed as ΔE. The colorimeter can print out the a*, b*, and L* data of the two colors, and directly print the ΔE value through the computer system, that is, the color difference.

The operation of the colorimeter generally includes the following steps:

1. Start the calibration of the colorimeter.

2. Use a colorimeter to measure color, measure the standard sample and the sample separately.

3. The colorimeter display screen displays the measurement data, and the measurement data can be printed.

4. Store and print out the required data.

The measurement of the colorimeter can be completed in a few seconds. The simple color difference meter can only calculate the color difference, not the ratio of the mixed colors. The high-end color difference meter can also have many functions. In addition to controlling the color, it can also control the formula and perform weighing.

Ultraviolet rays and uv meter

paintmetre — Tue, 01 Sep 2020 06:01:24 GMT

When ultraviolet rays are irradiated, the degree of eye injury is proportional to the time, inversely proportional to the square of the distance from the source, and related to the projection angle of the light. Regarding the harm of ultraviolet rays to human health:
When ultraviolet rays act strongly on the skin, photodermatitis can occur, and erythema, itching, blisters, edema, eye pain, tearing, etc. appear on the skin; severe cases can also cause skin cancer.
Ultraviolet rays act on the central nervous system, causing headaches, dizziness, and increased body temperature. Acting on the eyes, it can cause conjunctivitis, keratitis, called photoophthalmia, and may also induce cataracts. The ultraviolet rays generated during the welding process can cause welders to suffer from electro-optic ophthalmia (can be cured). UV meter can be used to test the uv irradiation intensity of the light sources.
Although ultraviolet rays exist throughout the year, the winter sunlight is relatively mild and the north is foggy, but the ultraviolet rays are only about 20% weaker than summer, and they still cause great harm to human skin and eyes. Therefore, it is still necessary to avoid ultraviolet rays in winter. Irradiation. Long-term ultraviolet radiation is most likely to cause various spots on the skin. Therefore, even in the cold winter, you should apply barrier cream or sunscreen during outdoor activities. Of course, an SPF index of 15 is enough. If you are going out for skiing or staying in the snow for a long time, it is best to wear goggles to prevent ultraviolet rays and strong white light from the snow from irritating your eyes.
In recent years, a large number of chemicals have destroyed the ozone layer in the atmosphere and destroyed this natural barrier that protects human health. According to a report provided by the National Meteorological Center, China's total atmospheric ozone layer has decreased year by year since 1979, and the ozone layer has decreased by 14% in 20 years. And for every 1% decrease in the ozone layer, the incidence of skin cancer will rise by 3%. At present, the Beijing Municipal Meteorological Bureau has issued the Beijing UV Index to help people properly prevent UV radiation.

Precautions for the use of ultraviolet germicidal lamps

paintmetre — Fri, 21 Aug 2020 06:52:50 GMT

Precautions for the use of ultraviolet germicidal lamps

　　 Without protective measures, exposure of human eyes and skin to ultraviolet light for more than 3 minutes may exceed the human safety limits set by the World Health Organization and the International Commission for the Protection of Non-Ionizing Radiation. If it is directly irradiated for more than 15 minutes, it will damage the cornea and cause electro-optic ophthalmia, sudden severe pain in the eyes, foreign body sensation, photophobia, tearing, or blepharospasm. Long-term exposure can damage the eyes and skin, cause eye trauma and severe skin burns, and may cause skin cancer.

　　How to use in ordinary households? UV disinfection lamps on the market are divided into two types: ozone and ozone-free. Among them, 254nm is ozone-free ultraviolet rays and 185nm is ozone-containing ultraviolet rays. The ozone-type ultraviolet germicidal lamp has strong oxidizing effect and can effectively kill bacteria. The dispersibility of ozone can just make up for the shortcomings of ultraviolet rays that only spread in a straight line and disinfection. However, excessive ozone is an invisible killer. It strongly stimulates the human respiratory tract, causing sore throat, chest tightness and coughing, causing bronchitis and emphysema. It requires opening windows for ventilation. The ozone-free UV germicidal lamp only spreads in a straight line, and there are dead spots for disinfection, but the ventilation time is shorter and the risk is lower. The ozone-free type is recommended for families with elderly, children, and pregnant women. UVC irradiance meter is used to test the uv irradiation intensity of the uvc led light sources.

　　 In terms of disinfection time, generally 30-60 minutes is appropriate to effectively kill viruses and bacteria. Take the disinfection time setting of a brand's flagship store as an example. In the space of 10, the 38W disinfection lamp needs to irradiate for 30 minutes, and the 60W disinfection lamp needs to irradiate for 15 minutes; the 40 space, the 38W disinfection lamp needs to irradiate for 60 minutes, and the 60W The disinfection lamp should be irradiated for 30 minutes. After disinfection, the ozone-free type needs at least 20 minutes of ventilation, and the ozone type needs more than 30 minutes to enter the room.

If you are at home, it is recommended to choose UVCLED disinfection equipment, such as mask ultraviolet sterilizer, toothbrush ultraviolet sterilizer, underwear ultraviolet sterilizer, shoe cabinet ultraviolet sterilizer and so on. Environmental protection and pollution-free. The current cost is not too high. A mask with UV sterilization treasure is only 400 yuan. It's still very cheap.

Harware coating thickness test

paintmetre — Wed, 19 Aug 2020 06:41:02 GMT

With hardware components, hardware furniture, and hardware daily necessities gradually entering people's lives, the spraying of paint on the surface of hardware becomes particularly important. The paint thickness on the surface of hardware components is not only related to its protection, anti-corrosion, and anti-wear performance, but to a greater extent, it is also closely related to the decorative aesthetic performance. In addition to causing cost waste, a thicker paint coating will also be visually bulky and prone to cracking of the paint film. Under normal circumstances, with the help of paint coating thickness gauge, the thickness of the paint layer on the surface of standard hardware components should be about 30 microns.
The standard widely followed in the hardware components industry should be: based on the measurement of paint coating thickness gauge, the thickness of the first spray paint coating is 20um 25um, and the thickness of the second spray paint coating is 40um50um. The thickest paint coating thickness is not Should exceed 60 um. The thickness of the paint coating is too low or too high to be non-compliant.
What instrument should be used to measure the paint coating thickness of hardware components? We recommend using Linshang LS223 mil thickness tester. It can be measured without calibration, and it can respond quickly within 0.5s, which not only guarantees the stability of the measurement, but also ensures the accuracy of the data.

The role of car paint meter LS220

paintmetre — Fri, 14 Aug 2020 03:58:41 GMT

The role of car paint meter LS220
The basic function of the dry film thickness gauge is to accurately detect the actual thickness of the dry film/paint film. The detected value can help people judge whether the thickness of the car model meets/exceeds the standard. The dry film thickness gauge is an important instrument to measure the thickness of the coating sufficient to ensure corrosion protection.
3. Testing of car paint meter
For the magnetic method, the magnetic properties and surface roughness of the base metal of the standard plate should be similar to those of the base metal of the test piece. For the eddy current method, the electrical properties of the base metal of the standard sheet should be similar to those of the base metal of the test piece. After the construction is completed, when the coating is dry, we use a dry film thickness gauge to measure the dry film thickness in accordance with the national standard GB1764-89 (79). The methods of measuring dry film thickness include lever micrometer and magnetic dry film thickness gauge, eddy current dry film thickness gauge and destructive testing.
When using Linshang car paint meter LS220, you only need to pinch the groove part of the instrument with your hands, and press the probe vertically on the surface of the object. The thickness of the car paint film will sho

UV light meter standards

paintmetre — Tue, 11 Aug 2020 08:29:05 GMT

Ultraviolet disinfection lamps have been widely used in my country since SARS in 2002, and ultraviolet disinfection equipment also played an important role in this year's H7N9 epidemic. In our daily life, it is necessary to use ultraviolet light to sterilize. In the process of ultraviolet sterilization and disinfection, it is necessary to ensure the intensity of ultraviolet radiation. The instrument for detecting the intensity of ultraviolet radiation is called an ultraviolet illuminance meter. Ultraviolet disinfection is something that we often come into contact with in our daily lives. The most common hospitals use ultraviolet lamps to irradiate and kill viruses. They are also commonly used for food safety disinfection and water treatment. The use of ultraviolet light for disinfection will use an ultraviolet irradiometer, which is used to detect the radiation intensity of ultraviolet disinfection to ensure that the standard sterilization effect is achieved.
Regarding UV light meter calibration and UV light meter verification procedures, China's UV irradiance working standards are mainly composed of spectroradiometers, standard UV light meters, various UV light sources, etc., which are used to store and reproduce UV irradiance measurement values . However, because the above-mentioned standards were established in 1989, they can no longer fully meet the traceability requirements of the modern market for UV irradiometers. With the gradual increase in the introduction of such ultraviolet illuminance meters from abroad, the coexistence of multi-national standards has emerged in the calibration of ultraviolet irradiance meters, which has caused confusion for the majority of users of ultraviolet illuminance meters.

Notes when using disinfection lamps

paintmetre — Thu, 30 Jul 2020 03:36:11 GMT

Note: When using ultraviolet disinfection lamps, keep the environment clean. There should be no dust and water mist in the air. When the indoor temperature is below 20 degrees Celsius or the relative humidity exceeds 50%, the exposure time should be extended. After scrubbing the floor, wait until the floor is dry before disinfecting with ultraviolet lamps; when using ultraviolet lamps to disinfect indoor air, the room should be kept clean and dry, reduce dust and water mist, and the temperature is lower than 20 degrees Celsius or higher than 40 degrees Celsius, and the relative humidity is greater than 60% When using ultraviolet to disinfect the surface of the article, the surface of the irradiated surface should be directly irradiated by ultraviolet light, and the irradiation dose should be sufficient; the ultraviolet light source should not be irradiated to people to avoid damage. When the ultraviolet lamp is working, it is necessary to leave people, livestock, etc., and some items that are not suitable for ultraviolet radiation need to be effectively covered. UVC meter is recommended to test the uv irradiation intensity of the uv disinfection lamps.
For UV lamp disinfection, the appropriate UV lamp power should be selected according to the indoor space, and the corresponding time should be matched (about half an hour).
The radiation intensity of the ultraviolet lamp gradually decreases during the use process, so the intensity of the disinfection ultraviolet light should be measured frequently, and once it drops below the required intensity, it should be replaced in time.
The service life of the ultraviolet disinfection lamp, that is, the time when the intensity of the new lamp is reduced to 70μW/cm 2 (power≥30W), or the time when the intensity of the original new lamp is reduced to 70% (power<30W), should not be low At 1000h.
Ultraviolet disinfection lamps are lamps that use ultraviolet rays to kill pathogenic microorganisms. All surfaces, water and air contaminated by pathogenic microorganisms can be disinfected by ultraviolet rays. The ultraviolet disinfection lamp used in China has high radiation intensity and longer distance disinfection and sterilization effect. When using it, it must be used without people to avoid long-term exposure to human eyes and skin.

Coronavirus killing

paintmetre — Wed, 29 Jul 2020 06:23:05 GMT

The new type of coronavirus is coming fiercely, and ultraviolet light and medical alcohol can kill the new type of coronavirus. This article will explain in detail why ultraviolet light can kill the new type of coronavirus.
At the beginning of 2020, the hearts of hundreds of millions of people have been held by the new coronavirus pneumonia. When the epidemic broke out, people hoarded all kinds of medical and daily necessities out of self-protection or panic, and they also raised many questions. For example, can ultraviolet lamps kill the new coronavirus?
The author summarized it by inquiring a lot of information for your reference. Let me start with the conclusion: ultraviolet light can kill the 2019 new coronavirus, which is medically named 2019-nCoV. UV light intensity meter is used to test the light intensity of the uv lamp.
Let me briefly talk about the virus. All living things, including humans, are composed of cells, while viruses are cell-free, mainly composed of protein coats and nucleic acids (a genome composed of one or more nucleic acid molecules: DNA or RNA), so strictly speaking, It is not a living thing, and because of this, the virus can only survive, metabolize, and reproduce in the cells of a certain organism. Once it leaves the living body, it will die in a short time.
The specific length depends on the strength of the virus itself, the weak for a few minutes, the general tens of minutes, and the strong can even survive for more than 48 hours. Academician Li Lanjuan once said: The new coronavirus can only survive for 48 hours in a dry environment, but after 2 hours of exposure to the air, its activity is significantly weakened.
In addition, the new coronavirus is replicated through RNA, and the process of ultraviolet disinfection mainly acts on the nucleic acid (RNA) of the virus and destroys the protein layer of the virus, thereby affecting its survival and replication ability. This process is called "inactivation" in medicine.

Usage of paint thickness meter

paintmetre — Mon, 27 Jul 2020 02:37:47 GMT

If a second-hand car is in the case of an accident, there must be traces of sheet metal or spray paint repair on the body paint, and the scope of repair will be relatively large. Therefore, as long as the detection of second-hand accident vehicles is involved, it is necessary to do paint inspection items to reveal the history of large and small accidents that have occurred in the vehicle, and to determine whether the vehicle is an accident vehicle. It can be said that if you understand the paint finish of the vehicle, you can roughly understand the history of the car and the accident. Of course, if you want to fully and accurately determine whether the vehicle is a technically recognized accident vehicle, you still need a professional second-hand car appraisal appraiser to pass professional equipment, and take the comprehensive inspection results of the chassis, front and rear anti-collision beams, and body structure as quasi.
If it is only to detect the paint surface of the car body, you can use the second-hand car identification artifact-"paint surface detector" to uncover the historical veil of vehicle sheet metal painting
GTS8102
As the name implies, the paint thickness meter is an instrument that detects the value of the paint surface of the car body. It determines whether there are traces of sheet metal or spray paint by testing the thickness of the paint surface and the iron skin of the body. In the inspection, the car roof is generally used as the benchmark. If the value of other parts is significantly higher than the benchmark value, the part of the vehicle can be judged to have undergone sheet metal and spray paint trimming. In the process of second-hand car identification, if the inspector finds that the difference between the value and the reference value is very large, the vehicle will be further inspected to see if there is any trace of an accident there and determine whether it is an accident car.
Tips: The paint surface of the new car is sprayed by computer automation, and it is carried out as a whole in a very clean dust-free workshop, so the thickness between the paint surface and the car body metal will be very uniform, and there will be no large difference. The paint sprayed manually after the vehicle is partially damaged is actually impossible to achieve the same thickness as the original paint. In addition, if there is repair of sheet metal, putty glue is applied between the paint surface and the metal, and the thickness between the paint surface and the metal will be greater.
Generally, the thickness of most cars is between 80-140, and a small number of imported cars may reach more than 150. If you test the left door of the car, you can test the five points on the top, bottom, left, right and middle of the door. The value you want to add and divide by 5 is the average value. If the value of a point is greater than the average value by more than 30um, it is judged that the car may be repaired. Of course, if the car door is completely replaced, it needs to be inspected from internal screws and other joint parts. Please pay attention to related articles for testing in this area.

Steel structure fireproof coating thickness measurement

paintmetre — Thu, 23 Jul 2020 02:22:05 GMT

I believe everyone should be familiar with the dry film thickness gauge, which is a professional instrument used to measure coating thickness. But most people should feel a little unfamiliar to hear about fire-resistant coatings for steel structures. Although the name is relatively long, it is essentially a fire-retardant coating, only applied to the surface of steel materials. The dry film thickness gauge has played a very important role in the selection of fireproof coatings for steel structures.
　　Dry film thickness gauge plays an irreplaceable important role in the process of selecting fireproof coatings for steel structures. Fire prevention is an important theme that cannot be avoided in daily life. Then the steel structure fireproof coating is also very important.
　　 In the process of producing fire-resistant coatings for steel structures, some businesses will reduce the thickness in order to reduce production costs. However, if the thickness of the fire-resistant coatings for steel structures does not meet the specified requirements, it will not be effective. It is conceivable that once a good coating thickness gauge is not used to detect the fireproof coating of steel structures, there will be great safety hazards. Therefore, choosing a suitable coating thickness gauge is very important.
　Dry film thickness gauge directly affects the whole process of selecting fireproof coatings for steel structures. According to the thickness used, steel structure fire retardant coatings can be divided into ultra-thin steel structure fire retardant coatings, whose coating thickness is less than or equal to 3mm; thin steel structure fire retardant coatings, whose coating thickness is greater than 3mm and less than or equal to 7mm; thick steel structure fire retardant coatings , The coating thickness is greater than 7mm and less than or equal to 45mm. Thin coatings are easy to apply, and they can be applied basically. Repeated spraying two or three times is almost the same.
　　 After the completion of the construction, the coating thickness gauge LS223 is used for testing, and the acceptance is relatively simple. The thick paint spraying process needs to divide the number of times, and there is also a time interval. It needs to be sprayed layer by layer to reach the specified thickness. Pay special attention when using the coating thickness gauge. At the time of acceptance, attention should also be paid to the use of scale calipers to extract different points and other details. It should also be noted that after a certain period of time, taking into account the influence of factors such as wear and tear, the coating thickness gauge should also be used for spot checks instead of a simple inspection.
　　Plating thickness gauge should also pay attention to the instrument itself and the method of use before and after use. In the process of using the coating thickness gauge, pay attention to the correct use of the instrument, otherwise not only the accurate thickness measurement results will not be obtained, but also huge damage to the instrument itself.
　　 In addition, the coating thickness gauge is a relatively sensitive instrument, which is particularly sensitive to adhesion substances that prevent the probe from contacting the surface of the coating. Therefore, before using the coating thickness gauge, the attached material must be removed to ensure that the probe is in direct contact with the covering surface. Choosing the correct method of use allows the coating thickness gauge to obtain the coating thickness measurement results efficiently and accurately, and also makes the user's own use process more comfortable.