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The use of PM2.5 sensors in indoor air purification equipment

Update: 2019-11-25 17:28 Source: LUFTMY Reading: ↻ News
 

According to the results of the first public welfare research report on indoor PM2.5 pollution released by Tsinghua University, compared with outdoor PM2.5 pollution, indoor PM2.5 pollution has a more obvious impact on people, and indoor PM2.5 intake is four times of outdoor PM2.5.

Why is indoor PM2.5 concentration higher than outdoor PM2.5 concentration?

This is due to what we normally call PM10, which refers to the concentration of dust particles with a diameter of 10 microns; PM2.5 refers to the concentration of dust particle diameter is 2.5 microns, is suspended particulate matter in indoor such small particles, we open a window ventilated, every day under the effect of level, the larger the diameter, the greater the force by horizontal movement speed is faster than the movement of the small diameter, so that the bigger the particles can be quickly removed from the outside, and small diameter will continue to stay indoors.

Air pollutant
Air pollutant

On the other hand, the particles of metabolites in the human body at night are mostly less than 0.3 μ m, which is not easy to diffuse. The indoor accumulation will be more, and the indoor concentration will be higher than that of outdoor PM2.5 after a long time. Therefore, in the case of haze, it is difficult for anyone to be alone. The way of closing the door and living, no matter what happens outside the window, is even more self deception.

What are the factors that cause the indoor PM2.5 content to exceed the standard

1. There are many sources of indoor pollution such as air conditioning, cooking, decoration, etc

Although smoking and outdoor air pollution are the two major factors of indoor PM2.5, they are not the only source. According to relevant research, air conditioning, cooking, decoration pollution and dust accumulation are also closely related to the deterioration of indoor air environment. According to the tests of Shanghai CDC and Fudan University, most of the air-conditioning dust in the families contains bacteria, viruses and other pollutants that are seriously over standard, and the number of the most serious family bacteria is 50 times more than that of the central air-conditioning in the shopping malls.

2. Smoking is the main factor that causes indoor PM2.5 to exceed the standard

Tobacco smoke includes 69 kinds of carcinogens and 172 kinds of harmful substances. Besides causing lung cancer, heart disease, bronchitis and asthma, it is also an important source of indoor air pollution. In the room where people smoke, about 90% of the total indoor PM2.5 comes from the fine particles in the second-hand smoke. Experts through detection found that as long as the room can smell smoke, PM2.5 is at least twice the standard.

Air pollutant
Air pollutant

Therefore, the best way to prevent and control indoor PM2.5 is to pay attention to the reasonable selection and correct use of air purifier. The air purification equipment is equipped with PM2.5 sensors. The negative ions in the air purifier can take the initiative to catch small particles of dust, make them coagulate and precipitate, and effectively remove the dust of 2.5 microns (PM2.5) and below.

Air purifier
Air purifier

In the current field of air purification, PM2.5 sensor has almost become the standard hardware of purification equipment. Its effect is to monitor the concentration of PM2.5 and other particles in the air. Its working principle is as follows: a constant light source (such as infrared light-emitting diode) is set inside the PM2.5 sensor. When the air passes through the light, the particles in it will scatter, leading to the attenuation of light intensity. The relative attenuation rate is proportional to the concentration of particles.

GDS06 Infrared PM2.5 dust sensor
GDS06 Infrared PM2.5 dust sensor

PM2.5 sensor brand LUFTMY,the infrared dust sensor GDS06 uses the principle of optical scattering to obtain the particle concentration.When a beam of parallel monochromatic light is incident on the particle field, it will be affected by the scattering and absorption around the particle, and the light intensity will be attenuated.The relative decay rate of incident light passing through the concentration field to be measured can be obtained. The relative attenuation rate can basically reflect the relative concentration of dust in the field to be measured.The intensity of light is directly proportional to the intensity of the electrical signal converted by photoelectric. The relative attenuation rate can be obtained by measuring the electrical signal, and then the dust concentration in the field to be measured can be measured, and then PWM and UART communication can be carried out by single chip microcomputer.The haze PM2.5 sensor gds06 detects about 0.3 μ m particles, such as indoor dust, pollen, microorganism, dust mite and cigarette smoke, and measures the concentration of floating particles in a space of no more than 10 μ M.This light scattering PM2.5 sensor is suitable for automatic air monitoring system in the room, such as air purifier, fresh air system, etc.

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