Beckman standard test reagents, Beckman standard test powders, Beckman standard particles.
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Guangzhou Beirui Chromatography Technology Co., Ltd. specializes in providing various Beckman standard testing reagents. Standard particles, etc. If what you need is not included in this list, please call our company to inquire.

Beckman Coulter Particle Size Analyzer Series

• Multisizer 4e Particle/Cell Counting and Particle Size Analyzer
• Multisizer 3 Particle/Cell Counting and Particle Size Analyzer
• DelsaMax PRO Multi angle Zeta Potential and Nanoparticle Size Synchronous Analyzer
• DelsaMax CORE Static Molecular Weight and Nanoparticle Size Synchronous Analyzer
• SA3100 specific surface area and pore size analyzer
• LS 13 320 XR laser diffraction particle size analyzer
• LS 13 320 series new micro nano laser particle size analyzer

Basic concepts of granularity analysis

(1) Particle: A small object with a certain size and shape, which is the basic unit that makes up a powder. It is macroscopically small, but microscopically contains a large number of molecules and atoms;

(2) Particle size: the size of particles;

(3) Particle size distribution: using a certain method to reflect the percentage of different particle sizes in the total powder;

(4) The representation methods of granularity distribution include table method (interval distribution and cumulative distribution), graphical method, and functional method, commonly including R-R distribution, normal distribution, etc;

(5) Particle size: The diameter of a particle, usually measured in micrometers;

(6) Equivalent particle size: refers to when a certain physical property of a particle is the same or similar to that of a homogeneous spherical particle, we use the straight diameter of the spherical particle

The diameter represents the actual diameter of the particle;

（7）D10， The particle size value corresponding to a cumulative distribution percentage of 10%;

D50， The particle size value corresponding to a cumulative distribution percentage of 50%; Also known as median diameter or median particle size;

D90， The particle size value corresponding to a cumulative distribution percentage of 90%;

D (4,3) average volume or mass particle size;

Common granularity measurement methods

(1) Screening method

(2) Settlement method (gravity settlement method, centrifugal settlement method)

(3) Resistance method (Coulter particle counter)

(4) Microscope (image) method

(5) Electron microscopy method

(6) Ultrasonic method

(7) Breathable method

(8) Laser diffraction method

Advantages and disadvantages of various methods

Screening method: Advantages: simple, intuitive, low equipment cost, commonly used for samples larger than 40 μ m. Disadvantage: Cannot be used for samples finer than 40 μ m; The results are greatly affected by human factors and mesh deformation.

Microscope method: Advantages: simple, intuitive, and capable of conducting morphology analysis. Disadvantages: Slow speed, poor representativeness, unable to measure ultrafine particles.

Settlement method (including gravity settlement and centrifugal settlement): Advantages: easy operation, instrument can operate continuously, low price, good accuracy and repeatability, and a large testing range. Disadvantage: The testing time is relatively long.

Resistance method: Advantages: easy to operate, can measure the total number of particles, clear equivalent concept, fast speed, and good accuracy. Disadvantages: The testing range is small, the small holes are easily blocked by particles, and the medium should have strict conductivity characteristics.

Electron microscopy method: Advantages: Suitable for testing ultrafine particles and even nanoparticles, with high resolution. Disadvantages: limited samples, poor representativeness, and expensive instrument prices.

Ultrasonic method: Advantages: It can directly measure high concentration slurries. Disadvantage: Low resolution.

Breathable method: Advantages: Low instrument price, no need to disperse the sample, can measure magnetic material powder. Disadvantage: It can only obtain the average particle size value and cannot measure the particle size distribution.

Laser method: Advantages: easy to operate, fast testing speed, large testing range, good repeatability and accuracy, and can be used for online and dry measurement. Disadvantage: The results are greatly affected by the distribution model