Dust particle counts shine brightly in the medical industry

In industries such as medicine, electronics, precision machinery and microbe, strict environmental cleanliness is required to conform to relevant standards and product quality. It includes monitoring and testing the purification effect and cleanliness level of various clean grade worktable, purification room and purification workshop.

Dust particle counter is used to measure the number and particle size distribution of dust particles per unit volume in a clean environment, so as to provide a basis for the evaluation of air cleanliness. The basic principle is that the detection laser of the sensor is scattered by dust particles and received by the photosensitive element and generates pulse signal, which is output and amplified, and then processed by digital signal. By comparing with standard particle signal, the comparison results are presented with different parameters. The measurement parameter setting, measurement result display, keystroke, timing, printing, time, date and data storage of the instrument are all controlled and realized by the built-in microcomputer. The instrument can simultaneously display the environment temperature and humidity and monitor and report the working state of the laser particle sensor.



Dust particle counter





Laser dust particle counter is a common dust particle counter in recent years, with light scattering type, measuring particle size range of 0.3-10 m, in addition, there are agglomerated nuclear type laser dust particle counter, can measure the size of smaller dust particles.

The light source is the key component of the dust particle counter and has great influence on the performance of the instrument. The light source requires high stability, long life and no interference. It is understood that the laser dust particle counter light source has two kinds of ordinary light source and laser light source. The laser dust particle counter using ordinary light source has a very low response to the particle signal below 0.3 m. The signal amplitude is similar to the noise amplitude of the counter itself. The signal is difficult to detect from the noise. Although labelled with a 0.3 m channel, such instruments are suitable only for the determination of particles greater than 0.3 m, especially those greater than 0.5 m. Because of the good monochromness of laser and the stable concentration of light energy, the laser dust particle counter with laser light source has a high signal-to-noise ratio, which is widely used in the medical and electronic industries.