Many people may not have heard of it Dust sensor With the rapid development of industrial production and the destruction of the environment, the dust concentration in the air is constantly increasing, which has become an increasingly urgent problem to be solved in our country.
Dust refers to the solid particles suspended in the air. It is easy to produce a large amount of dust in industrial production, such as metallurgy, machinery, building materials, light industry, electric power and other industries. According to their size, dust can be divided into total suspended particles, inhalable particles (PM10) and fine particles (PM2.5). Particles with aerodynamic equivalent diameter less than or equal to 2.5 μ m in ambient air are usually referred to as fine particles, i.e. PM2.5 we often hear. PM10 refers to the particles with aerodynamic equivalent diameter less than or equal to 10 μ m in ambient air. PM2.5 fine particles have small diameter, long suspension time in the atmosphere, long spread distance, and usually contain a large number of toxic and harmful substances, so it has a greater impact on human health. (dust sensor)
As shown in the figure below, most of the dust particles with aerodynamic equivalent diameter above 10 μ m are deposited by impact, and most of them are deposited in nasopharynx when inhaled by human body, and dust below 10 μ M can enter the deep part of respiratory tract. However, most of the dust deposited in the alveoli is less than 5 μ m, especially less than 2 μ M. However, the dust less than 0.5 μ m, especially the dust less than 0.1 μ m, will be impacted by the surrounding gas molecules and form irregular movement, which is usually called diffusion effect. The dust with diameter less than 10 μ m and can enter the alveolar area is also called aspirating dust. （ Dust sensor ）
Therefore, the upper limit of aerodynamic equivalent diameter of dust entering alveoli is 10 μ m. This part of dust entering alveoli has an important biological role. If we live and work in such environment for a long time, it is easy to cause pneumoconiosis. According to the different chemical composition of inhaled dust, pneumoconiosis can be divided into several types, such as silicosis, silicosis, carbon pneumoconiosis, metal pneumoconiosis, mixed pneumoconiosis, etc. at the same time, mild pneumoconiosis may also have pneumoconiosis, or some lung diseases caused by organic dust. (dust sensor)
In China, air quality has become a serious problem. In order to make the indoor clean and safe air, the dust removal function of air conditioner is necessary. In addition to adding air filter to air conditioner, more importantly, dust sensor, such as GE dust sensor, can monitor PM2.5 and PM10 dust at the same time, and use it to monitor the dust concentration in indoor and outdoor air at any time According to the test data of dust sensor, the indoor air can be updated when necessary, and the inlet air volume of fan can be controlled to achieve the purpose of cleaning indoor air and energy saving and environmental protection. The application of dust sensor in civil air conditioner will also be essential.