Jabo teaches you how to choose a satisfactory laser particle analyzer Jabo teach you how to choose and buy satisfactory laser particle size analyzer Wuxi Jabo Electrical Technology Co., Ltd. 13301515116
1, laser particle size analyzer measuring range of wide size range, suitable for wide application. Not only to see the scope of the instrument, but also to see how the main detector area of small particle scattering <0.5 m> how to detect.
The best way is the full range of direct detection, so as to ensure the consistency of the end of the deduction. Hybrid testing of different methods, and then the computer to be synthesized by a map, certainly bring error.
2, laser light source is generally used in 2mW laser, power is too small, scattered light energy is low, causing low sensitivity; in addition, the length of the gas source, the stability is better than the solid light source. Detector because the laser diffraction halo radius is bigger, the weaker light intensity, extremely easy to cause small particle SNR reduction and missed, so of small particles distributed detection can reflect the instrument is good or bad. The development of the detector has experienced several stages of circular, semi circular and sector.
3, using the Mie theory completely
Because the Mie light scattering theory is very complicated, large amount of data processing, so some manufacturers ignore particle of the refractive index and absorption of optical properties, the approximation of the Mie theory, resulting in the limited application range and increase the chances of missing problem.
4, accuracy and repeatability index
The higher the better. NIST standard particle detection.
5, stability
The stability of the instrument includes the stability of the optical path and the stability of the dispersion system and the influence of the environment. General selection of gas lasers, using optical platform, help path stability. Internal heating elements (e.g., 50 W tungsten lamps) will affect the environment around the light path.
Stability indicators are not in the manufacturer's instrument, the user can only judge and visit the instrument structure and visit or ask other long time used by the user to judge.
6, scanning speed
Scanning speed can improve data accuracy, repeatability and stability.
Different manufacturers of instrument scanning speed is different, from 1 times / sec to 1000 times / sec. Generally speaking, circular scan test number, the better results in an average accuracy. Therefore, the speed, the higher the better; spray drying and spray requests the speed, the higher the better; free fall type dry although speed is not fast, but because the particles only through the sample zone, speed is also fast to some good.
The amount of sample that the user needs to handle every day is also a factor in consideration.
Can be automatic, no need to change the lens, can be automatically corrected.
7, use and maintenance of simplicity
About this, before the purchase is often ignored, and in fact directly determines the efficiency and life of the instrument. Understanding of the method is to understand the structure of the instrument and other existing users.
Disassembly, cleaning is convenient: particle size analyzer is divided into two parts, the main engine and the dispersion. The sample flow cell is always need to be cleaned regularly, and the cleaning interval depends on the nature of the sample. The host and disperser combined instruments tend to sample pool deep within inside the instrument, removal and disassembly is very complicated, and easily touch bad light path system.
8, must comply with the international standards
ISO13320 standard is the basic requirement of laser particle size analyzer. Non laser diffraction is used to measure the distribution of submicron particles.
