The dust particle counter is an instrument for measuring the number of dust particles and the particle size distribution in the unit air volume in a clean environment. Dust particle counters are widely used in medicine, electronics, precision machinery, color tube manufacturing, microbiology and other industries to achieve the monitoring of the cleanliness and cleanliness levels of various clean-grade workbenches, cleanrooms, and purification plants to ensure product quality. quality.
Common dust particle counters are light-scattering (APC), measuring a particle size range of 0.1-10 μm, and a condensed-core dust particle counter (CNC) to measure even smaller dust particles. This article will introduce a light scattering particle counter.
Dust particle counter works
Particles in the air will scatter under light irradiation. This phenomenon is called light scattering. Light scattering is related to factors such as the particle size, the wavelength of the light wave, the refractive index of the particle, and the light absorption characteristics of the particle. However, in terms of scattered light intensity and particle size, the intensity of the scattered light of the particles increases as the surface area of ​​the particles increases.
Dust particle counter workflow
First, the vacuum pump system passes the gas to be detected through the particle counter laser head at a prescribed flow rate. The dust particles in the gas will scatter the laser signal in the particle counter so that the optical sensor therein receives and generates the pulse information number. Secondly, the pulse information number is output and amplified, and then the digital signal processing is performed. By comparing with the standard particle signal, the comparison result is expressed with different parameters. The number of electrical pulses corresponds to the number of particles, and the amplitude of the electrical pulses corresponds to the size of the particles.
Precautions for using particle counters
1. Do not start the counter when the inlet tube is covered or blocked.
2. The particle counter should be used in a clean environment to prevent damage to the laser sensor.
3. Do not measure mixed gases (such as hydrogen and oxygen) that may react. This gas may also explode inside the counter. To measure these gases, contact the manufacturer for more information.
4. Do not sample compressed air without a high-pressure decompression device (such as a high-pressure diffuser). All particle counters are designed to operate at atmospheric pressure.
5, water, solution or other liquid can not enter the sensor from the inlet tube.
6. The particle counter is mainly used to test the clean environment of the purification plant. When measuring the material of loose particles, dust source, spray, it must be kept at least 12 inches away from the inlet tube. In order to avoid the above particles and liquid pollution sensors and pipelines.
7. At the time of sampling, the gas sampled from the counter itself or contaminated by the gas from the counter is not sampled.
8. When connecting an external printer or connecting an external temperature and humidity sensor, turn off the counter first; when performing a printing operation, the printer must have printing paper, otherwise it will damage the print head.
Zhejiang Sujing Purification Equipment Co., Ltd. is located in Daoshui Town, Shangyu District, Shaoxing City, Zhejiang Province. It is an excellent manufacturer in the purification equipment industry in East China. Can provide professional air purification systems for industries such as microelectronics, biomedicine, hospital operating rooms, fiber optic cables, food and beverages, precision instruments, semiconductors, and new material applications in accordance with the ISO14644-1 standard, GB50073-2001 national standard, and national GMP specifications. Engineering design, construction, testing and technical services.
The company's main purification table series, air shower series, fume hood series, biological safety cabinet series are widely used in medical and health, electronics, pharmaceuticals, biology, food, agriculture, forestry, animal husbandry and veterinary, inspection and quarantine, aerospace, automotive manufacturing, Precision instruments, universities and research institutes enjoy a high reputation in the domestic and Southeast Asian markets.
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