There are many instruments and methods for performing particle size testing, of which laser method is the most versatile method. It has the advantages of fast test speed, convenient operation, good repeatability and wide test range. It is one of the main methods of modern particle size measurement. In addition, there are sedimentation method, electric resistance method (Coulter method), image method and so on.
At present, there are about 15 manufacturers of particle size instruments in China, with an annual output of more than 1000 various particle size test instruments. The main performance of some products has reached or is close to the advanced level of similar foreign products. The domestic particle size analyzer mainly uses many small and medium-sized laboratories in China as the main market. There are also more than a dozen foreign-scale equipment manufacturers in China that set up branch offices or offices in China, and sell about 300 sets of various granular instruments annually. Imported particle size analyzers mainly use integrated laboratories and foreign-funded enterprise laboratories as the main markets. Since domestic and imported products are aimed at two different customer groups, low-end and high-end, respectively, two different camps have been formed.
In the face of more complex markets, users should consider the following factors when purchasing a particle size analyzer:
(1) Test range: The test range refers to the area included between the upper and lower limits of the test of the particle size analyzer. If the actual particle size of the sample is outside the testing range of the instrument, it is impossible to get the correct result. Moreover, the particle size range of the actual sample is preferably in the middle of the instrument measurement range, because the accuracy of the middle section is the highest, and the closer to both ends, the greater the error of the test. Therefore, when selecting an instrument, the test range should have a certain margin.
(2) Repeatability: Repeatability is the main indicator of the quality of the instrument. It is most realistic to verify the repeatability of the instrument by means of actual measurements. Repeated
Generally, three values ​​of D10, D50 and D90 are used.
(3) Cost: The cost includes the payment paid for the instrument, the service life (depreciation rate) of the instrument, the complete configuration, the consumables and consumables costs, and the maintenance costs. Therefore, it is not enough to consider the original price when purchasing the instrument, but also consider the use, service, qualification and other aspects.
(4) Uses: Due to the different performance of different particle size analyzers, more suitable instruments can be selected according to different needs. For example, if the amount of test is large and the sample type is large, the laser particle size analyzer should be used. If the test volume is small and the sample is single, the sedimentation particle size analyzer can be selected. It is necessary to understand the particle shape and other special indicators.
(5) Consistent with industry habits and major customers: Due to the particularity of particle size testing, test results of different particle size analyzers tend to be biased. In order to reduce unnecessary troubles, a particle size analyzer that is the same as the industry habits and major customers (same principle or even the same model) should be used.
(6) Qualification, quality and service: In China, the particle size analyzer is a measuring instrument, and the state adopts a licensing system for measuring instruments. The manufacturer that has the “manufacturing permit for measuring instruments†is accredited by the government, is qualified and legal. Its product quality and service quality are guaranteed. In addition, we must also examine the manufacturer's research and development capabilities, process assurance measures, service measures, and provide test guidance capabilities for users.
(7) Can you provide an original test report on the performance of the instrument.
In short, granular testing is a professional and technical job. This work has an important impact on the production process of powder products and product quality control, and has high requirements for personnel, instruments and environment. Understand the basic knowledge and basic methods of granular testing, which has certain practical significance for doing good granularity testing.
(1) Test range: The test range refers to the area included between the upper and lower limits of the test of the particle size analyzer. If the actual particle size of the sample is outside the testing range of the instrument, it is impossible to get the correct result. Moreover, the particle size range of the actual sample is preferably in the middle of the instrument measurement range, because the accuracy of the middle section is the highest, and the closer to both ends, the greater the error of the test. Therefore, when selecting an instrument, the test range should have a certain margin.
(2) Repeatability: Repeatability is the main indicator of the quality of the instrument. It is most realistic to verify the repeatability of the instrument by means of actual measurements. Repeated
Generally, three values ​​of D10, D50 and D90 are used.
(3) Cost: The cost includes the payment paid for the instrument, the service life (depreciation rate) of the instrument, the complete configuration, the consumables and consumables costs, and the maintenance costs. Therefore, it is not enough to consider the original price when purchasing the instrument, but also consider the use, service, qualification and other aspects.
(4) Uses: Due to the different performance of different particle size analyzers, more suitable instruments can be selected according to different needs. For example, if the amount of test is large and the sample type is large, the laser particle size analyzer should be used. If the test volume is small and the sample is single, the sedimentation particle size analyzer can be selected. It is necessary to understand the particle shape and other special indicators.
(5) Consistent with industry habits and major customers: Due to the particularity of particle size testing, test results of different particle size analyzers tend to be biased. In order to reduce unnecessary troubles, a particle size analyzer that is the same as the industry habits and major customers (same principle or even the same model) should be used.
(6) Qualification, quality and service: In China, the particle size analyzer is a measuring instrument, and the state adopts a licensing system for measuring instruments. The manufacturer that has the “manufacturing permit for measuring instruments†is accredited by the government, is qualified and legal. Its product quality and service quality are guaranteed. In addition, we must also examine the manufacturer's research and development capabilities, process assurance measures, service measures, and provide test guidance capabilities for users.
(7) Can you provide an original test report on the performance of the instrument.
In short, granular testing is a professional and technical job. This work has an important impact on the production process of powder products and product quality control, and has high requirements for personnel, instruments and environment. Understand the basic knowledge and basic methods of granular testing, which has certain practical significance for doing good granularity testing.
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