The laser particle size analyzer has advanced testing principles, superior analysis capabilities, efficient and convenient sample preparation, simple and convenient operating procedures, rich and intuitive output data, and powerful expansion capabilities. Using the wet dispersion technology, the mechanical stirring makes the sample evenly dispersed, the ultrasonic high-frequency oscillation makes the agglomerated particles fully dispersed, and the electromagnetic circulating pump makes the size particles uniformly distributed in the entire circulation system, thereby fundamentally ensuring the wide distribution of the sample tested. Accurately repeat.
Laser particle size analyzer purchase method: a wide range of particle size measurement range, suitable for a wide range of applications. Not only depends on the range reported by the instrument, but also depends on the detection of small particle scattering <0.5 μm beyond the area of ​​the main detector.
The best way is to directly detect the entire range, so as to ensure the consistency of the background deduction. Mixing tests of different methods and then using a computer to fit into a map will definitely bring errors. Laser light source is generally used 2mW laser, power is too low then the scattered light energy, resulting in low sensitivity; In addition, the gas light source wavelength is short, the stability is better than solid light source. Because the laser diffraction ring diameter of the detector is larger, the light intensity is weaker, and the signal-to-noise ratio of the small particle is easily reduced and missed. Therefore, the distribution detection of small particles can reflect the quality of the instrument. The development of the detector has undergone several stages of round, semicircular and fan-shaped.
The laser particle size analyzer uses the complete Mie theory: Because the Mie theory of light scattering is very complicated and the data processing volume is large, some manufacturers ignore the optical properties such as refraction and absorption of the particles themselves, and adopt the approximate Mie theory, which limits the scope of application. , the possibility of missed inspections increased.
The higher the accuracy and reproducibility of the laser particle size analyzer, the better. Use NIST standard particle detection. The stability of the laser particle size analyzer includes the stability of the light path and the stability of the dispersion system and the influence of the surrounding environment. In general, gas lasers are used. Optical platforms are used to help stabilize the light path. Internal heat-generating components (such as a 50-watt tungsten lamp) will affect the ambient light path. Laser particle size analyzer scan speed can improve data accuracy, repeatability and stability.
The scanning speeds of instruments from different manufacturers vary from 1/sec to 1000/sec. In general, the more loop scan tests, the better the average result, so the higher the speed, the better; the jet dry method and spray require higher speed, the better; Free-fall dry method, although not fast, but Since the particles only pass through the sample area once, the speed is also faster. The amount of sample that the user needs to process every day is also a factor that considers speed. Automatically centered, no need to change the lens, can automatically correct.
The ease of use and maintenance of laser particle size analyzers: This is often overlooked before purchase, and in fact directly determines the efficiency and longevity of the instrument. The method of understanding is the understanding of the instrument structure and the reflection of other existing users. Disassembly and cleaning are convenient: The particle size analyzer is divided into two parts: host and diffuser. The sample flow cell always needs to be cleaned regularly, and the cleaning interval depends on the nature of the sample. The instrument that combines the host and the diffuser often has the sample cell deep inside the instrument. Removal and disassembly are both tedious and can easily damage the optical system. The laser particle size analyzer must comply with international standards: The ISO 13320 standard is the basic requirement for laser particle size analyzers. The use of non-laser diffraction methods is not standard in the measurement of submicron particle distribution.
Laser particle size analyzer purchase method: a wide range of particle size measurement range, suitable for a wide range of applications. Not only depends on the range reported by the instrument, but also depends on the detection of small particle scattering <0.5 μm beyond the area of ​​the main detector.
The best way is to directly detect the entire range, so as to ensure the consistency of the background deduction. Mixing tests of different methods and then using a computer to fit into a map will definitely bring errors. Laser light source is generally used 2mW laser, power is too low then the scattered light energy, resulting in low sensitivity; In addition, the gas light source wavelength is short, the stability is better than solid light source. Because the laser diffraction ring diameter of the detector is larger, the light intensity is weaker, and the signal-to-noise ratio of the small particle is easily reduced and missed. Therefore, the distribution detection of small particles can reflect the quality of the instrument. The development of the detector has undergone several stages of round, semicircular and fan-shaped.
The laser particle size analyzer uses the complete Mie theory: Because the Mie theory of light scattering is very complicated and the data processing volume is large, some manufacturers ignore the optical properties such as refraction and absorption of the particles themselves, and adopt the approximate Mie theory, which limits the scope of application. , the possibility of missed inspections increased.
The higher the accuracy and reproducibility of the laser particle size analyzer, the better. Use NIST standard particle detection. The stability of the laser particle size analyzer includes the stability of the light path and the stability of the dispersion system and the influence of the surrounding environment. In general, gas lasers are used. Optical platforms are used to help stabilize the light path. Internal heat-generating components (such as a 50-watt tungsten lamp) will affect the ambient light path. Laser particle size analyzer scan speed can improve data accuracy, repeatability and stability.
The scanning speeds of instruments from different manufacturers vary from 1/sec to 1000/sec. In general, the more loop scan tests, the better the average result, so the higher the speed, the better; the jet dry method and spray require higher speed, the better; Free-fall dry method, although not fast, but Since the particles only pass through the sample area once, the speed is also faster. The amount of sample that the user needs to process every day is also a factor that considers speed. Automatically centered, no need to change the lens, can automatically correct.
The ease of use and maintenance of laser particle size analyzers: This is often overlooked before purchase, and in fact directly determines the efficiency and longevity of the instrument. The method of understanding is the understanding of the instrument structure and the reflection of other existing users. Disassembly and cleaning are convenient: The particle size analyzer is divided into two parts: host and diffuser. The sample flow cell always needs to be cleaned regularly, and the cleaning interval depends on the nature of the sample. The instrument that combines the host and the diffuser often has the sample cell deep inside the instrument. Removal and disassembly are both tedious and can easily damage the optical system. The laser particle size analyzer must comply with international standards: The ISO 13320 standard is the basic requirement for laser particle size analyzers. The use of non-laser diffraction methods is not standard in the measurement of submicron particle distribution.
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