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Ultrasonic and eddy current paint thickness meters

uvradiometer — Mon, 10 Aug 2020 09:20:16 GMT

Eddy current paint thickness meter
Eddy current thickness gauges are generally used to measure the thickness of insulating coatings on non-ferrous metal substrates. This method is also a non-destructive measurement method.
The instrument uses a fine wire coil capable of conducting high frequency AC (above 1MHz) to generate an alternating magnetic field on the surface of the instrument probe. When the probe approaches a conductive surface, the alternating magnetic field will form eddy currents on the surface. The characteristics of the base material and the distance between the probe and the base (that is, the coating thickness) will affect the size of the eddy current.
The eddy current generates a relative electromagnetic field, which can be sensed by the excitation coil or another adjacent coil.
The appearance and operation of the eddy current thickness gauge are similar to the electromagnetic induction thickness gauge. This type of instrument can measure almost all coating thicknesses on non-ferrous metals.
Like the electromagnetic induction thickness gauge, it usually uses a constant pressure probe and displays the measurement result on the LCD screen. In addition, they can also choose to store the measurement results or analyze the readings instantly and output them to a printer or computer for further inspection.
The measurement deviation is generally about ±1%. The test is sensitive to surface roughness, curvature, substrate thickness, the type of metal substrate material and the distance between it and the edge. The test method can refer to international standards such as ASTM B 244, ASTM D 7091 and ISO 2360.
Nowadays, many thickness gauges combine the principle of electromagnetic induction and eddy current into one system. Some simple measurement tasks can be automatically switched from one operating principle to another based on requirements to measure the coating thickness on most metals. These integrated systems have been widely recognized and welcomed by the paint industry and powder coating industry.
Three, ultrasonic paint thickness meter
The ultrasonic echo pulse technology used in ultrasonic thickness gauges is generally used to measure the thickness of the coating on the surface of non-metallic substrate materials (such as plastics, wood, etc.). Moreover, this method is a non-destructive measurement method and will not affect the measurement. The sample caused damage.
The probe of the instrument contains an ultrasonic transducer that can send pulses through the coating. The pulse is then reflected from the matrix material back to the transducer and converted into a high-frequency electrical signal. Through digital analysis of the echo waveform, one can effectively determine the thickness of the coating. In some cases, the instrument can also measure the thickness of a single layer in a multilayer system.
The measurement standard deviation of this method is generally about ±3%, and the measurement method can refer to the ASTM D6132 international standard.
Four, micrometer thickness gauge
People sometimes use a micrometer to measure the thickness of the coating. They have the advantage of measuring any coating/substrate combination, but the disadvantage is that they need to touch the exposed substrate surface.
Contacting the upper surface of the coating and the lower surface of the substrate is sometimes very difficult, and they are usually not enough to measure the thickness of some thin coatings very accurately and sensitively. Therefore, it is necessary to perform two measurements using this method, one on the surface with the coating, and the other on the surface without the coating. The difference between these two degrees, that is, the measured height difference, is the thickness of the coating. On some rough surfaces, this method generally measures the thickness of the coating at the highest point.

Coating thickness gauge measurement principles

uvradiometer — Thu, 06 Aug 2020 06:31:22 GMT

Linshang Technology's coating thickness gauge can automatically switch the measurement substrate, and can measure the coating thickness on various metal substrates such as magnetic and non-magnetic. The measurement of the instrument adopts the two principles of Hall effect and eddy current.
Linshang Technology released a variety of coating thickness gauges in 2019, all of which adopted a unified display. Multiple measurements can be achieved with one button. Currently the instrument supports three measurement modes: iron-based measurement, non-ferrous-based measurement and automatic measurement mode. In the automatic measurement mode, the instrument can automatically switch the measurement substrate, and can measure the coating thickness on various metal substrates such as magnetic and non-magnetic.
Linshang Technology Coating Thickness Gauge uses two principles of Hall effect and eddy current. The Hall effect is the generation of a voltage difference (Hall voltage) across an electrical conductor, transverse to the current in the conductor and perpendicular to the current applied to the magnetic field. The Hall coefficient is defined as the ratio of induction. The electric field is the electric field of the product of the current density and the applied magnetic field. It is a characteristic of the material from which the conductor is made, because its value depends on the type, number and nature of the charge carriers that make up the current.
Coating thickness gauge detects the coating thickness of the metal surface
Eddy current: Eddy current phenomenon is caused by the intersection of a moving magnetic field and a metal conductor, or by the perpendicular intersection of a moving metal conductor and the magnetic field. In short, it is caused by electromagnetic induction effects. This action produces a current circulating in the conductor. The faster the magnetic field changes, the greater the induced electromotive force and the stronger the eddy current; the eddy current can heat the conductor.
The coating thickness gauge detects the coating thickness on the back of the phone
The instrument using these two measuring principles is different from a single iron-based coating thickness gauge or a non-ferrous coating thickness gauge. Such a coating thickness gauge can test the coating thickness on a variety of substrates.
Of course, the instrument also has an ultra-short 0.5s measure

UV intensity tester test fly killer intensity

uvradiometer — Mon, 03 Aug 2020 08:12:24 GMT

Fly killers can use ultraviolet rays to attract light-tending insects and induce insects to approach the UV tube. When insects come into contact with the fly paper or high-voltage electric fence placed in the fly killer, they will be stuck or electrocuted to kill them. The effect of insects. The effect of the fly-killing lamp is closely related to the ultraviolet lamp tube. As an indispensable instrument for monitoring the intensity of the ultraviolet lamp tube, the UV intensity tester can help the user find the failed lamp in advance and replace it.
1. The working principle of the three fly kill lamps
At present, there are three common fly-killing lamps, photocatalyst fly-killing lamps, stick-trap fly-killing lamps and electric shock-type fly-killing lamps. The first two are relatively safe, will not cause secondary pollution, and are helpful for users to observe and record the number and types of insects and analyze trends.
The photocatalyst fly-killing lamp attracts mosquitoes through ultraviolet light and carbon dioxide and water released by the photocatalytic reaction. When the mosquitoes are sucked into the capture window, they will be sucked to the bottom by the vortex formed by the fan, and finally dried to death.
The stick-trap fly-killing lamp attracts mosquitoes through the ultraviolet rays emitted by the ultraviolet lamp tube, and then sticks the mosquitoes through the sticky mosquito paper in the fly-killing lamp to finally achieve the purpose of killing flies.
The last type of electric shock-type fly-killing lamp also uses ultraviolet rays to induce mosquitoes to approach the fly-killing lamp, and then electrocute the mosquitoes through the high-voltage electric fence near the fly-killing lamp. This method will disperse the corpses when the mosquitoes are electrically shocked, which is likely to cause secondary pollution, so it is no longer advocated.
2. The life span of the UV tube affects the effect of the fly killer
The fly-killing effect of the fly-killing lamp mainly depends on the built-in ultraviolet lamp. The ultraviolet lamp of the fly-killing lamp that has been used for more than one year is also recommended to use professional equipment to detect whether the lamp emits sufficient ultraviolet rays, because of the coating on the surface of the lamp. Once consumed, it cannot emit ultraviolet rays that can attract light-tending insects. Even if it is on, it cannot achieve the effect of attracting insects.
Before the large number of insects multiply, it is best to carry out certain maintenance of the protection facilities to ensure that they can deal with the upcoming pests. Here we recommend a must-have product for the inspection of fly-killing lamps and UV tubes-UV measuring instrument.

UV LED light sources

uvradiometer — Fri, 31 Jul 2020 02:35:24 GMT

Why will UVLED lamps replace high-pressure mercury lamps? The advantage of UVLED lamps and high-pressure mercury lamps is that there is no heat radiation
High-power LEDs do not emit infrared light. The surface temperature of the irradiated product rises below 5 degrees Celsius, and the traditional mercury lamp method of ultraviolet curing machine generally raises the surface of the irradiated product by 60 to 90 degrees Celsius, which causes the positioning of the product to shift, resulting in product failure. The UV-LED curing method is suitable for thermally sensitive and high-precision bonding process requirements such as plastic substrates, lens bonding, electronic products, and optical fiber cables.
Environmentally friendly and pollution-free　
The traditional mercury lamp curing machine uses a mercury lamp to emit light. There is mercury in the bulb, which makes the waste disposal and transportation very troublesome, and improper handling can cause serious environmental pollution. The LED curing machine uses semiconductors to emit light, and there is no environmental pollution. Therefore, the use of LED curing machine is more environmentally friendly. UV intergrator is used to test the uv energy and uv irradiation intensity of the curing light sources.
Super illuminance
High-power LED chips and special optical design achieve high-precision and high-intensity irradiation of ultraviolet light; currently, the maximum output of ultraviolet light reaches 200,000 mW/m2. Using the latest optical technology and manufacturing process, it has achieved a higher intensity output and uniformity that is more optimized than the traditional mercury lamp irradiation method, which is almost twice the luminosity of the traditional mercury lamp method, which makes the UV adhesive cure faster and shorten Production time has greatly improved production efficiency. When the traditional mercury lamp type point light source curing machine increases the irradiation channel, the increase of the channel will cause the output energy of a single irradiation channel to decrease. With LED-type irradiation, each irradiation head emits light independently, and the irradiation energy is not affected by the increase in the channel, and always remains at the maximum. Because of its super concentrated illuminance, compared with mercury lamps, UV LED shortens the irradiation time of the operation and improves the production efficiency.

What is the intensity of ultraviolet radiation?

uvradiometer — Tue, 28 Jul 2020 07:48:21 GMT

What is the intensity of ultraviolet radiation?
First of all, there are two types of ultraviolet UV lamps: UVA-340 and UVB-313.
UVA-340 Wavelength: 315~400nm, Irradiation intensity: 1.0W/m2.
UVB-313 Wavelength: 280~315nm, Irradiation intensity: 0.68W/m2.
The editor recommends that you choose the corresponding UV lamp according to the test requirements of the product.
The service life of the above UV lamps is 1800~2500 hours.
If it is a UV germicidal lamp used in hospitals, the intensity is lower than 70uW/cm2. The lamp tube must be replaced.
We can use UV light meter to test the germicidal lamp irradiation intensity. If the intensity of the germicidal lamp attenuates, the sterilization effect won't be achieved. UVC band is usually used for sterilization.
LS126C UV light meter 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 UVC light meter 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.
The editor recommends that you choose the corresponding UV lamp according to the test requirements of the product.
The service life of the above UV lamps is 1800~2500 hours.
If it is a UV germicidal lamp used in hospitals, the intensity is lower than 70uW/cm2. The lamp tube must be replaced.
We can use UV light meter to test the germicidal lamp irradiation intensity. If the intensity of the germicidal lamp attenuates, the sterilization effect won't be achieved. UVC band is usually used for sterilization.
LS126C UV light meter 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 UVC light meter 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.

LS126C UV light intensity meter parameters

uvradiometer — Mon, 27 Jul 2020 03:36:36 GMT

LS126C UV light intensity meter parameters
1. Spectral response: λ:(230nm-280nm);λp = 254nm
2. Measuring range: 0-8000 uW/cm2
3. Resolution: 0.1 μW/cm2
4. Measurement accuracy: ±10%
5. Host size: length 130mm × width 70mm × height 28mm
6. Probe size: diameter 45mm×thickness 16mm
7. Probe cable length: 1 meter
8. Instrument weight: about 250 grams
9. Battery: 4 AAA alkaline dry batteries
standard
1. WS/T 367-2012 "Technical Specification for Disinfection in *** Institutions" P15, Appendix A.3 Effect monitoring of ultraviolet disinfection.
2. The 2009 version of "*** Disinfection Technical Specification" P9, 2.3 UV disinfection.
3. Ultraviolet germicidal lamp GB19258-2003 P4, rated value of ultraviolet radiation illuminance.
The above standards stipulate the following:
1. Only 5 minutes after turning on the UV lamp can the UV intensity of the lamp be measured stably.
2. The instrument is placed 1m vertically under the UV tube for measurement.
3. The new ordinary 30W straight tube ultraviolet lamp is qualified if the irradiation intensity is greater than 100uW/cm2.
4. The irradiation intensity of the UV lamp in use must be greater than 70uW/cm2 to qualify.
5. The peak wavelength of the ultraviolet germicidal lamp is 253.7nm. Only the ultraviolet lamp of this wavelength (UVC) has the sterilization function.
6. Different power UV lamps have different radiation ratings.

UV ruler hook
In order to meet the *** standard, the measurement ensures that the UVC ultraviolet irradiance meter is located 1 meter vertically down the middle of the tube. Our company also produces a UV ruler hook for purchase, this hook is 1m long. Place the instrument and hang it directly on the lamp tube to facilitate on-site UV intensity measurement.

How to choose gloss meter?

uvradiometer — Fri, 24 Apr 2020 03:43:47 GMT

Before choosing a gloss meter, we first need to briefly introduce the specific factors that affect the gloss of the stone. We mainly start with the particle size of the stone and the grinding and polishing process. It should be mentioned that most stone materials are natural minerals, the particles are often not uniform, and there is a huge difference in the overall size of the particles. In general, the smaller and more uniform the particles, the higher the gloss, that is, the stronger the ability to refract light. When we look at the stone from different directions, the visual gloss is also different, which is related to the structure of the human eye.

LS191 gloss meter parameters:

Measuring angle: 60 °

Measuring range: 0-200GU

Resolution: 0.1GU

Repeatability: 0-100GU: ± 0.2; 100-200GU: ± 0.2% reading

Reproducibility: 0-100GU: ± 0.5; 100-200GU: ± 0.5% reading

Indication error: 0-100GU: ± 1.5; 100-200GU: ± 1.5% of reading

Zero error: 0.1GU

Measured light spot: 9mm * 15mm

Measured item size: 28mm (length) * 14mm (width)

Working temperature: 10 ～ 40

Storage temperature: -10 ~ 60

The internal structure of the stone with strong gloss is dense, delicate and smooth to the touch, and the particle size is very uniform, which is closely related to the grinding process and polishing process. When people buy stone, they judge the glossiness by naked eyes, and there will be a big deviation, and the use of precision gloss meter will quantify a vague concept, giving people an intuitive choice. The low-gloss stone will become smooth after the modern polishing process, and the gloss will also increase. We can use the gloss meter to detect its slight difference.