Particle size analyzer is a kind of universal particle sizer that measures the size of powder particles according to the light scattering principle. It has a wide dynamic range, fast measurement speed, and easy operation. It is very suitable for measuring powder droplets and liquid droplets with a wide range of particle size distribution. Many particle size analyzers integrate laser technology, modern optoelectronic technology, electronic technology, precision machinery and computer technology, and have many advantages. Now it has become the most popular particle size analyzer in the world. As a new type of particle size testing instrument, particle size analyzer has been widely used in other powder processing and application fields. Its application has important significance for improving product quality and reducing energy consumption.
Particle size analyzer is one of the most widely used type of instruments, so in the use of the process should pay attention to a number of matters: First, the measurement unit warm-up; in the first boot, or shutdown more than half an hour and then repeat the boot needs to be pre- heat. Second, the system is centered; in the system alignment, the center of the laser beam is adjusted to the center of the ring photodetector. Third, the system parameters are set; in the main menu, click “File†with the left mouse button and the “File†submenu will pop up on the screen. Then click "Restart" with the left mouse button and the screen will continue to pop up "System Parameter Settings". In this column, enter: ultrasonic time, tester, etc. Fourth, sample preparation; sample preparation refers to taking representative data from the powder material to be measured as a measurement sample, selecting an appropriate suspension and dispersant, mixing the sample with the suspension, and allowing the sample particles to be Sufficient dispersion in the suspension without chemical reaction with the suspension and dispersant.
What should be noticed in the measurement of the particle size analyzer:
The limitations of different particle size analyzer technologies: Different particle size analysis techniques are limited by their measurement principles. For example, the light diffraction method cannot measure particles smaller than the natural linewidth of the light source; the sedimentation rule is not only affected by the influence of large-size end turbulence, but also small. Size-end diffusion (Brown motion) limitations. Some measuring instruments can also impose certain limitations due to manufacturing and operating procedures. Sometimes the measurement technique also imposes restrictions on the preparation of the measurement sample. The PCS measurement must suspend the particles, and the electron microscope preparation requires good dispersion. Therefore, to understand the limitations of measurement technology and strictly meet its limitations, it is necessary to obtain correct measurement results.
Measurement Benchmark: The principle of different particle size analyzer technologies is different, and the original information source and measurement target are different. For example, the original information source of the light diffraction method is the scattered light intensity, and it is required to prevent the control of the information source by a few large particles in the fine particle. The electro-sensitive technology counts by the volume of the particle, so the benchmarks of the methods are different, and they cannot be simply compared to each other. Therefore, it must be emphasized that the data conversion will bring obvious errors due to different benchmarks.
The ability to separate particles and particle size test technology selection: Based on the separation ability of the particles. The technique of measuring particles can be divided into single particle count, particle classification and overall average results. Image analysis and microscopy are typical methods of single particle technology; grading methods include sieving, sedimentation, centrifugation, and particle chromatography; overall average particle size analysis methods, and particle size analysis, ie, measurement, is calculated from the sum of all collected particle generation signals. The results are obtained by analysis and are the average of the measured particles. Therefore, it is easy to realize automation and online analysis, but the resolution is low. The particle analyzer used for catalyst industrial production selects the overall average method. In most cases, the laboratory research wants to obtain single particle technology and appearance information. The selection of the classification method should be considered in conjunction with the measurement of particle properties and measurement methods.
Particle size analyzer information and technical indicators requirements: particle size analyzer information requirements. Refers to the expression of the results given. Can be the average particle size, cumulative frequency value, normal distribution, distribution width. Lognormal distribution can also be used The relative amount of each peak in the asymmetric distribution width, multimodal distribution, and the different nominal (eg, number of particles, volume, area, etc.) expression of the accumulated frequency. The most useful information for catalyst particle size analysis is the distribution of the number of particles of the average particle size and particle size.
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