Airborne particulate pollution is the main source of pollution in the production and processing of many industries. Accurate assessment of air cleanliness has become a requirement for production and product testing in many industries. For example, in the electronics industry and the chip manufacturing industry, the deposition of fine particles in the gas can cause even worse electrical characteristics. Especially in recent years, the chip line width has reached the micron and sub-micron levels, which puts forward higher requirements for the cleanliness of the air in the plant.
In addition, in modern medicine and pharmaceuticals and bioengineering, the "Pharmaceutical Manufacturing Quality Management Standards" formulated and implemented by countries around the world, including China, also emphasizes the requirements for the cleanliness of particulate matter in the air during pharmaceutical production. In particular, with the implementation of the "National Medium and Long-Term Scientific and Technical Development Planning Outline", as 16 major development projects, core electronic devices, high-end general-purpose chips, and major new drug creations will be rapidly developed, which makes particle count measurement and Monitoring becomes more urgent.
Dust particle counter is an instrument used to measure the number and particle size distribution of dust particles per unit volume in a clean environment. It can be widely used for authoritative institutions such as drug testing institutes, blood centers, epidemic prevention stations, disease control centers, quality supervision institutes, and production enterprises such as biological, pharmaceutical, semiconductor, optical or precision mechanical processing.
It is estimated that there are more than 10 manufacturers of dust particle counters in China, and the number of Taiwanese parts used in China should be no less than 30,000. These manufacturers and users have very strong calibration and testing needs. To ensure the accuracy of dust particle measurement in the air, we first need to ensure that the dust particle counter itself is accurate and traceable. The research completed by the China Institute of Metrology established a standard particle counter calibration device, which achieved the verification and calibration of the standard particle counter's particle count indication error, particle size file setting relative error, and particle size measurement resolution calibration items. The uncertainty is 6.0% (k = 2), which is better than the technical level of the same foreign measurement calibration device. At the same time, they also established a working-level particle counter calibration device to achieve effective calibration of the working-level (laboratory, portable) particle counter particle count indication error.
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