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UV LED energy meter used in UV curing
In recent years, UV curing technology has become more and more widely used. What industries can UV curing technology be applied to?
1. The watch industry: such as dial printing, UV transparent paint on the watch cover.
2. Timber industry: High-grade wooden floors are coated with UV paint. After being polished and polished more than ten times, the floor is extremely bright, wear-resistant and waterproof, but the price is high.
3. Plastic decoration industry: such as plastic decoration boards for bathroom, kitchen, hall, curtain boxes, etc. can be coated with UV varnish.
4. In the bonding technology of advertising, shoemaking, etc .: the bonding between transparent materials can be cured and fastened without any volatile matter, as long as the UV curing adhesive is applied between the two materials and the UV light is irradiated instantly The connection effect feels like one.
5. UV curing dental filling materials have been widely used abroad. The UV material has good toughness and fast filling speed. Generally, the filling material needs to be filled several times, and it can be used once.
UV LED energy meter should be use in UV curing technology to test the ultraviolet energy used in UV curing process
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How to use UV power puck?
The UV power pucks produced by Linshang are based on different light sources. There are special UV power pucks LS120 for high-pressure mercury lamps and halogen lamps, which can ensure national measurement. , Can perfectly respond to the UVA LED light source of 340nm-420nm. All instruments can test energy, power, temperature, time at the same time, and also have curve display, can export data and print test reports and other functions.
The method of using UV power puck is as follows:
1. Long press the power button to set the automatic mode / manual mode. The manual mode is directly selected for routine testing. Since the recording time is only 32 minutes, for some production lines that are very long and need to run for a long time before reaching the UV light source, it is recommended to choose the automatic mode.
2. After the UV power puck is turned on, the instrument will display the last measurement result, and the running status is STOP. Press the SELECT button to view the last test data, short press the "power" button to choose whether to start the next measurement.
3. After starting the measurement, just point the test hole on the back of the UV power puck to the light source. After the test is completed, short press the "power" button to end the measurement (automatic mode is lower than the trigger value to automatically end the measurement).
4. After the measurement is completed, the instrument automatically saves the measurement data. You can press the "SELECT" button to view the test data of the maximum value, minimum value, power curve, and temperature curve.
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UV culring light sources and UV integrator
UV energy (mJ / cm2) = UV intensity (mW / cm2) * exposure time (S). During curing, the UV energy and exposure time can be precisely controlled to accurately control the UV energy. Because the UV light source will decay with time, in order to control the consistency of the UV energy in the curing process, it is necessary to use a UV integrator to monitor.
The UV integrator is mainly used to detect whether the power and energy of the ultraviolet light source reach the curing standard, to detect whether the ultraviolet light source is attenuated or whether it needs to be replaced.
UV curing light sources are mainly divided into two categories:
1. High-pressure mercury lamp: The principle is that the mercury in the lamp is excited by the voltage to change into mercury gas to emit ultraviolet, visible and infrared rays. Due to the shortcomings of mercury lamps, short life, high power consumption, high cost of use, increased temperature, large volume, and mercury-containing defects, the industry has been improving, but it has been difficult to break through the limitations of the original hardware. The light source of mercury lamp has been used in UV curing for a long time.
2. LED curing light source
: It has the characteristics of environmental protection, energy saving, long life, no heat radiation, and miniaturization of equipment that traditional mercury lamps do not have. In addition to providing stable UV light with a single wavelength, LEDs with different powers at 365nm, 385nm, 395nm, and 405nm can also be selected. UV LED curing equipment has started from point light sources, and has now developed into multi-branch, multi-purpose, linear light sources, surface light sources, wireless portable light sources, etc. to meet the needs of various curing occasions. Because it does not contain mercury, it is a new type of energy-saving and environmentally friendly product, which makes the UV curing of the product faster, more efficient, greener and more environmentally friendly.
The UV integrator is mainly used to measure the UV energy of different light sources, and is suitable for printing machines and other machines. To ensure that the printing and drying process reaches the ideal quality control. You can determine whether the light source is attenuating, whether you need to extend the curing time to achieve the curing effect you need, or whether you need to replace the lamp directly.
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Coating thickness tester used for paint film thickness measurement
A coating thickness tester (also referred to as a paint thickness gauge) is used to measure paint film thickness. Paint film thickness is probably the most critical measurement in the coatings industry because of its impact on the coating process, quality and cost. Paint film thickness measurements can be used to evaluate a coating's expected life, the product's appearance and performance, and ensure compliance with a host of International Standards.
It is an essential quality assurance tool when anodizing, galvanizing and applying zinc coating to metallic surfaces. A coating thickness tester also is used to measure body paint thickness and uniformity on pre-owned cars, revealing repainted spots, identifying hidden damages and exposing undisclosed accidents. This information is important when determining the actual value of a used car. In addition, certain types of thickness gauges can measure wall thickness and determine the hardness of metals, plastics and glass.
LS221 coating thickness tester is also called coating thickness meter and paint thickness meter. It is a professional instrument for measuring the thickness of metal surface coatings. The host and the probe adopt a separate design, which is convenient for viewing data while testing under complex test conditions. It can be used in the laboratory and engineering field.
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Coating thickness gauge measure fireproof coating thickness
The manufacturing industry and some heavy industry fields often spray coatings on the surfaces of flammable and explosive materials to achieve the purpose of fire protection. The thickness of this coating is directly related to its role. The thickness of the steel structure fireproof coating within the standard range can effectively extend the fire resistance time of the material, and the fire resistance of the material will also be greatly improved.
The surface coating thickness gauge is precisely for this purpose, non-destructive measurement of the thickness of the steel structure fireproof coating to make small adjustments, so that the performance of the steel structure fireproof coating tends to be standardized and standardized.
Application of surface coating thickness gauge in fire protection
Surface coating thickness gauge parameters:
Probe: fixed ruby
Probe model: F3N3 probe
Measuring principle: Fe: Hall effect / NFe: eddy current effect
Measuring range: Fe: 0.0-3000μm; NFe: 0.0-3000μm
Unit: μm / mil
Measurement accuracy: 0-3000μm: ≤ ± (3% reading + 2μm)
Measurement interval: 0.5s
Measuring area: Ø = 25mm
Radius of curvature: convex: 5mm / concave: 25mm
Body thickness: Fe: 0.2mm / NFe: 0.05mm
Usually we use Linshang LS223 surface coating thickness gauge to detect the thickness of fireproof coating. This surface coating thickness gauge is equipped with two probes F3N3 and F5N3. Users can choose the surface coating thickness gauge suitable for them according to the size of the coating thickness they measure. The instrument uses the non-destructive measurement principle of Hall effect and eddy current effect, which will not damage the surface of the coating. The instrument has the following characteristics:
1. The design is simple and the operation is simple. Only zero adjustment is required to start the test.
2. The probe uses ruby, which is wear-resistant and corrosion-resistant, which can prolong the service life of the instrument.
3. The instrument can automatically identify the measurement substrate, and has three measurement modes of iron-based measurement (Fe), non-iron-based measurement (NFe) and automatic identification (Fe / NFe).
4. The instrument adopts advanced digital probe, which is not easy to be interfered during measurement, and the measurement accuracy is high.
Linshang LS223 surface coating thickness gauge with large measuring range is suitable for the measurement of fireproof coatings
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What is gloss meter and how to choose it?
1. What is a gloss meter?
Gloss meter (also called gloss meter) is an instrument used to measure the specular reflection (such as gloss) on the surface of an object. The gloss is determined by projecting the light beam onto the surface at a fixed intensity and angle and measuring the amount of reflected light at equal but opposite angles.
2. How to choose a suitable gloss meter?
Determine whether the surface of the object you want to measure is flat. If the surface of the object is flat, it can be measured using a traditional gloss meter. Curved surfaces should be measured using equipment specifically designed for this type of application. For example, a portable handheld gloss meter. The instrument is small and convenient for measurement. However, the light hole measured by the instrument needs to cover part of the measured object surface.
3. To select the correct gloss meter, we need to consider the gloss of the measured object and the measuring range of the gloss meter.
"Measurement angle" refers to the angle between incident light and reflected light. Three measurement angles (20 °, 60 ° and 85 °) can measure the gloss of most paints. The angle is selected according to the gloss range of the object. We can measure the object with a 60-degree angle gloss meter. If the gloss exceeds 70GU, we can use a 20-degree angle gloss meter. If the gloss is less than 20GU, you can use an 85-degree angle gloss meter. If you can't judge the surface gloss of the object to be measured, you can buy a universal 60-degree angle gloss meter. With the continuous improvement of the gloss meter's resolution, a measurement angle of 60 degrees can already meet the measurement requirements of most objects.
If it is a high-gloss object, it is recommended to use Linshang LS192 portable gloss meter. This gloss meter is a multi-range gloss meter with a measuring range of up to 1000GU. It can be used for the surface gloss test of paints, coatings, inks, plastics, paper, ceramic tiles, ceramics, stone, metal and electroplated layers. The test data is comparable to the German BYK gloss meter.
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Portable gloss tester measure plastic surface glossiness
The degree of gloss on the plastic surface will affect the appearance quality of the product. In order to ensure the decorative effect and performance of the product, the gloss after polishing needs to be evaluated.
Gloss is a characteristic of the surface of plastic products. Different materials and differences in the smoothness of the surface will cause a great difference in the gloss of plastic products. Generally speaking, the higher the density of the material, the better the gloss after polishing. After the plastic parts are polished and polished, due to the change in the smoothness of the surface, the gloss of the plastic surface will disappear or decrease. With the portable gloss tester, you can accurately measure the glossiness of plastic polished and polished parts.
Before using the portable gloss tester to measure the samples of the plastic parts, after the instrument is calibrated after starting up, the samples before the plastic polished and polished parts and the samples after the plastic polished and polished can be measured separately. In order to evaluate the effect of plastic polishing on gloss.
Gloss tester measures plastic polished and polished parts
Portable gloss tester LS191, take multiple points on the surface of the sample for measurement, place the instrument on the surface of the sample to be tested, closely fit, and press the measurement key to count the maximum, minimum, average and average test Variance values, etc.
Linshang LS192 portable gloss tester can be used for the surface gloss test of paints, coatings, inks, plastics, paper, tiles, ceramics, stone, metal and electroplated products. It is a 60 degree angle gloss meter with measurement range up to 1000GU. The test data can be comparable to the German BYK gloss tester.
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Window tint meter help choose high quality window film
At present, the glass film on the market is dazzling. Consumers who do n’t know how to choose it, what kind of glass film is good? Now I will talk about my point of view. Relatively speaking, the quality of the glass film of a big brand will be guaranteed , But the price will be much more expensive, so how to choose cheap, good quality, suitable for their own glass film, according to the customers I know at present, basically want heat insulation film, explosion-proof film are relatively few.
1. Choose some points of the heat insulation film. The hand film should be textured and not soft. The good heat insulation film will buzz with your fingers. The sound is very crisp and natural. The poor film is basically nothing. sound.
2. In terms of heat insulation, make an experiment under the sun or Yuba to see if the heat insulation of the film is good. If there is metal on the edge of the film, the film without metal is generally not a good film.
3. Tear off the white film and smell if it smells. The lighter taste means less formaldehyde, and the stronger the formaldehyde is.
4. When the white film is torn, rub the film on the ground or the wall, and the color will fade.
5. Choose the film that suits you. The more expensive it is, the better the insulation film and explosion-proof film are. When buying a glass film, say whether you need better insulation or better explosion-proof effect. , The business will naturally recommend it.
Now the good glass insulation films are basically more than 100-200 per square meter, expensive ones are not recommended to post, and the ideal of which must be known to everyone.
To better choose high quality window film , we shall use a
window tint meter
to test the optical performance of window film.UV Peak wavelength: 365nmIR Peak wavelength: 940nmVisible light wavelength: 380-760nm, conforming to the CIE photopic luminosity function
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Plating thickness meter manufacturer in China
The LS220 plating thickness meter produced by Linshang, a plating thickness meter manufacturer, is professionally used to detect the thickness of second-hand car paint films. When detecting the thickness of the paint film of a used car, the instrument is turned on and the probe is pressed vertically on the surface of the car to obtain the thickness of the paint film. The test can be repeated at the same location, and the average value is the thickness of the paint film. If the detected car paint thickness is higher than 400μm, it can be determined that the car has been scratched or a serious car accident, and it is still repaired. This car should be purchased carefully. Because it is likely that there are problems with the internal parts of the car, this car is likely to have an accident during driving. Whether it is for the quality of the car or for our personal personal safety, when buying a second-hand car, it is recommended to use the coating thickness gauge of the coating thickness gauge manufacturer Linshang Technology to detect whether the vehicle has experienced a car accident.
Plating thickness meter manufacturer Linshang instruments measure the thickness of car paint
LS220 product parameters of Linshang, a plating thickness meter manufacturer:
Measuring principle: Fe: Hall effect / NFe: eddy current effect
Probe type: built-in integrated
Measuring range: 0.0-2000μm
Resolution: 0.1μm: (0μm-99.9μm)
1μm: (100μm-999μm)
0.01mm: (1.00mm-2.00mm)
Unit: μm / mil
Measurement accuracy: ≤ ± (3% reading + 2μm)
Measurement interval: 0.5S
Minimum measurement area: Ø = 25mm
Minimum radius of curvature: convex: 5mm / concave: 25mm
Minimum substrate thickness: Fe: 0.2mm / NFe: 0.05mm
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Transmittance meter | Frosted glass light transmittance measurement
The surface of the frosted glass is rough, which causes diffuse reflection of light, and transmits light without perspective. The transmittance meter LS117 made by the principle of diffuse transmission is used to measure the light transmittance. It is an advanced instrument with an integrating sphere effect. It is also suitable for optical density testing of aluminum film, film, X-ray film, lens ink and other material sources. And light white translucent materials, matte matte materials transmittance test.
Transmittance meter features:
1. Simultaneously measure optical density, relative optical density, dot area ratio and light transmittance.
2. Equipped with a fixed base and a bracket, which can be fixed for testing, and the probe can also be taken down to test larger-sized materials.
3. The light source adopts 380-760nm full-wavelength visible light, which complies with the CIE photopic luminosity function to ensure that it passes the inspection of the metrology institute.
4. It is suitable for many occasions such as birth, quality inspection and inspection.
Linshang LS117 transmittance meter is an instrument that can measure both optical density and light transmittance. The instrument adopt the diffuse transmission principle which is suitable for the optical density test of aluminized film, film, X-ray film, lens ink and other materials. The light transmittance test of opalescent translucent materials and frosted matte materials, such as zirconia, opalescent acrylic and so on. The light source of the instrument complies with the CIE photopic luminosity function and can pass the inspection of Chinese national metrological institute.
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Anticorrosive paint thickness standard
1. What are the relevant specifications for the thickness of the anticorrosive paint for steel structures in China
"Code for Construction Quality Acceptance of Steel Structure Engineering" GB50205-2001 Section 14: "Steel Structure Coating Engineering" Section 14.2.2 Main Control Items: "Paint, coating passes, and coating thickness shall all meet the design requirements. When the design does not require the thickness of the coating, the total thickness of the dry paint film of the coating: outdoor should be 150μm, indoor should be 125μm, and its allowable deviation is -25μm. The allowable deviation of the thickness of the dry paint film per pass is -5μm. "
Number of inspections: random inspection of 10% according to the number of components, and no less than 3 components of the same type.
Inspection method: Check with a dry paint film thickness gauge. Each component is tested at 5 places, and the value of each place is the average value of the thickness of the dry paint film of 3 measuring points separated by 50mm.
Second, what is the thickness of the steel structure anticorrosive paint
Different paints and different corrosion environments have different thicknesses of anticorrosive paints.
C2 corrosive environment (low corrosion): service life / dry film thickness: low: 80; medium: 150; high: 200;
C3 corrosive environment (medium corrosion): service life / dry film thickness: low: 120; medium: 160; high: 200;
C4 corrosive environment (high corrosion): service life / dry film thickness: low: 160; medium: 200; high: 240;
C5-I corrosive environment (high industrial corrosion): service life / dry film thickness: low: 200;
C5-M corrosive environment (high marine corrosion): service life / dry film thickness: medium: 280; high: 320;
Therefore, when spraying paint, it depends on what corrosive environment the substrate is in.The more serious the corrosion, the thicker the paint film.
Linshang LS223 + F5N3 coating thickness gauge also called coating thickness tester is an instrument that separates the host from the probe. The maximum measuring range of the probe is 5000μm and the meter can automatically identify the measuring substrate. This instrument uses both Hall Effect and eddy current measurement principles to measure the non-magnetic coating thickness on magnetic substrates and the non-conductive coating thickness on non-magnetic substrates. It is a dual-use instrument for both iron and aluminum.
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Light transmittance meter | Frosted glass transmittance measurement
Frosted glass looks very similar to sandblasted glass in appearance. Because of the diffuse reflection effect of light after being processed, it is mostly used in office curtain walls, bathrooms, doors and windows. Helps reduce the transmission of light. The difference between frosted glass and sandblasted glass is as follows:
Frosted glass is ordinary float glass obtained by grinding the glass on the machine. After grinding, the surface is very rough, which can greatly reduce the transmission of light, but it cannot be seen through.
Sandblasted glass is sprayed on the surface of the glass with hydrofluoric acid, and can be obtained by over-etching the glass surface. It also has the effect of light transmission and no perspective.
The processing method of frosted glass and sandblasted glass is different, and the effect achieved after processing is the same. Measuring the light transmittance of frosted glass and sandblasted glass can be measured using the Linshang light transmittance meter LS117.
The difference between frosted glass and sandblasted glass and light transmittance tester
Light transmittance meter LS117 is an advanced optical density meter made with the principle of diffuse transmission and having an integrating sphere effect. It is suitable for detecting the light transmittance of various diffuse transmission materials such as opalescent, foggy, matte, etc ; optical density measurement of X-ray film, aluminum film, and various film films.
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UVB wavelength application and its detection
UVB (full name in English: ultraviolet radiation b) is a wavelength band that divides the ultraviolet wavelength 7a64e4b893e5b19e31333431353263 according to different biological effects. The wavelength of the UVB lamp is 275-320nm, also known as medium-wave erythema effect ultraviolet, which is mainly used in medical treatment and aging Tests, spectral analysis, etc., UVB ultraviolet has erythema effect on the human body, can promote the metabolism of minerals in the body and the formation of vitamin D, but long-term or excessive exposure will cause skin tanning, and cause redness and peeling.
Dermatological phototherapy tubes, ultraviolet health lamps, and plant growth lamps are made of special transparent glass (does not transmit light below 254nm) and phosphors with a peak near 300nm.
With the rising of deep ultraviolet LEDs, UVA and UVC LEDs have slowly replaced traditional mercury lamps, gradually occupying the market. However, for the application field of UVB LED, everyone is still groping, and it is certain that phototherapy is a new and predictable direction. Phototherapy is a method of using electromagnetic radiation to produce light of different wavelengths to treat skin diseases
The uvb meter LS125 can test the ultraviolet radiation illuminance of various wavelength bands of UVA, UVB and UVC. The uvb meter uses a digital probe, plug-in design, a host can intelligently match 9 different probes. The host can intelligently determine the probe model.
The uvb meter LS125 is widely used in the fields of photochemistry, polymer material aging, flaw detection, ultraviolet light source, plant cultivation, large-scale integrated circuit lithography and other fields.
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UV intensity meter test UVA, UVB , UVC wavelengths
Ultraviolet rays include UVA band (320nm-380nm), UVB band (280nm-320nm) and UVC band (200nm-280nm).
The UVA band is mainly used in photocuring, lithography exposure, ultraviolet light source, integrated circuit lithography and other industries.
The UVB band is mainly used for ultraviolet health care lamps, medical physiotherapy lamps, plant growth lamps, fluorescent lamps, and aging experiments.
UVC band, also known as short-wave sterilization ultraviolet. The ultraviolet sterilization lamp emits UVC short-wave ultraviolet.
For different wavelengths of ultraviolet light, different parameters of UV intensity meter should be selected for detection. There is an UV intensity meter LS125 on the forest, which can test the ultraviolet radiation illuminance of various wavelength bands of UVA, UVB and UVC. The instrument uses a digital probe, plug-in design, a host can intelligently match 9 different probes. The host can intelligently determine the probe model.
UVA, UVB, UVC UV intensity meter LS125
LS125 is a smart host that can support 9 different probes. It can intelligently identify different probes. This host is connected to the probe through an aviation plug. The main function of the host is to display the test data. The host equipped with the probe can be used for ultraviolet intensity and energy detection. When using the host, you need to buy the corresponding probe to use with it according to the test needs.
How to use the UV intensity meter LS125:
1. Press the button to turn on, and then enter the measurement interface.
2. In the measurement mode, the interface displays the real-time value, maximum value, minimum value, average value of power, measurement duration, and energy value in real time.
3. Short press the "HOLD" key, the "HOLD" mark is displayed in the lower left corner of the interface, all data is kept on the LCD, and the current data is saved in the historical record.
4. Short press the up and down keys to view the historical data
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Ultraviolet radiometer used in medical industry
According to the GMP certification requirements of the new national pharmaceutical factory, cleaning verification must be carried out when replacing drugs in pharmaceutical production. When using riboflavin for cleaning verification, a 365nm ultraviolet lamp must be used.
Inspection principle: Riboflavin is very sensitive to 365nm ultraviolet light, and a high-intensity 365nm ultraviolet lamp can stimulate the intense yellow-green fluorescence of riboflavin. Therefore, for riboflavin cleaning verification, you must purchase 365nm black light lamps, but not all black light lamps work. Different black light lamps emit different levels of ultraviolet light. It is recommended to use high-intensity ultraviolet lights and black light. The effect of the black light lamp is not directly related to the power. It mainly depends on the ultraviolet output intensity of the black light lamp. The effect of using a high-intensity ultraviolet lamp to check riboflavin will be more clear.
So how does the 365nm UV lamp detect the intensity? You can use the LS125 ultraviolet radiometer + UVA-X1 probe. The spectral response range of the ultraviolet radiometer is 260nm-400nm, calibrated to a 365nm light source, which is very suitable for 365nm UV lamp intensity and energy detection.
Application of ultraviolet radiometer in pharmaceutical cleaning verification
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Waterrpoof UV radiometer for you
As the technology continues to mature, ultraviolet air disinfection and water sterilization are widely used. In the ultraviolet sterilizer, the core part that plays the role of sterilization is the ultraviolet sterilization lamp. Generally, 254nm germicidal lamps are the main ones.
For ultraviolet sterilization in water treatment, when the irradiation dose is above 30000W / (s • cm2), it generally takes only 1 second to play a good role in killing common bacteria and viruses. Different types of bacteria require different exposure times. For ultraviolet germicidal lamps also need to be high-power. Whether the luminous efficiency of the ultraviolet sterilization lamp meets the standard, whether the power of the lamp tube is attenuated after a period of use, these all need to use the water treatment sterilization lamp ultraviolet radiation illuminance meter LS125 to regularly test the sterilization lamp.
The LS125 + UVC-WP probe of the ultraviolet radiation illuminance meter on the forest is waterproof. A probe specially developed for water treatment high-power sterilization lamps. The probe response wavelength is 230nm-280nm. It has a waterproof function and a waterproof depth of up to 1 meter. It can simultaneously detect the intensity and energy of the sterilization lamp.
LS126C UV radiometer is a professional instrument for measuring the intensity of UVC germicidal lamps, that is, the power of ultraviolet radiation energy per unit area. The UV radiometer is delivered with a 1-meter test hook in accordance with the 1-meter test requirements specified in the "WST 367-2012 Regulation of disinfection technique in healthcare settings" to ensure full compliance with the test standards. The LS126C UV radiometer also has a Bluetooth data transmission function. After connecting with the mobile phone APP, it can monitor the intensity of the germicidal lamp in real time from a certain distance to avoid UV burns during the test.
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Mutiple probe light intensity meter
Up to now, the Linshang light intensity meter LS125 has been developed. At present, a host can freely match 9 different probes. There are 5 UVA bands, namely UVA, UVA-X1, UVALED, UVALED-X1 and UVALED-X3.
The main unit of the light intensity meter LS125 can automatically identify the probe model. The instrument has rich statistical functions, which can display the real-time value, maximum value, minimum value and average value of the tested power, measurement time and energy value.
light intensity meter with different probes
The application areas of the UVA probe of the light intensity meter LS125 are as follows:
1.UVA: 315mn-400nm, ultraviolet curing, high-pressure mercury lamp intensity and energy test
2.UVA-X1: 260nm-400nm, UV aging box, UV intensity and energy test in sunlight
3. UVA LED: 340nm-420nm, ultraviolet curing, UVA LED surface light source intensity and energy test
4.UVA LED-X1: 340nm-420nm, ultraviolet curing, UVA LED point light source intensity and energy test
5.UVA LED-X3: 340nm-420nm, intensity and energy test of low power UVA LED light source
Light intensity meter LS125 is connected by aviation plug wire, it is very convenient to freely replace the probe of other wave band and it is very flexible to use.
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