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What is an air purifier? The function of built-in PM2.5 sensor?

Update: 2019-12-09 16:58 Source: LUFTMY Reading: ↻ News

The air purifier, as its name implies, purifies the indoor air quality. It can improve the indoor air quality to a certain extent, but the improvement degree must be based on a certain standard and have a certain period. This period is also related to many factors, such as filter screen, specific indoor air quality, etc.

Air purifier
Air purifier

What is an air purifier?

Air purifier, also known as "air cleaner", air freshener and purifier, refers to the products that can absorb, decompose or transform various air pollutants (generally including PM2.5, dust, pollen, peculiar smell, formaldehyde and other decoration pollution, bacteria, allergens, etc.) and effectively improve air cleanliness, mainly divided into household, commercial, industrial and building.

What is the main function of air purifier?

1. Remove particles, such as PM2.5, bacteria, pollen, etc. Most air purifiers work well.

2. Remove gaseous pollutants, such as formaldehyde, benzene, garbage odor, glue and paint odor, etc. The effect of most purifiers is not good. But a small number of professional formaldehyde removal purifier effect is good.

3. Release negative ions (also called water ions, negative oxygen ions, nano fog, etc.) to clean the air.

4. Humidification to increase air comfort.

The purifying effect of an air purifier
The purifying effect of an air purifier

Why use air purifier?

Since 2013, we have known the power and harm of haze. In many cases, PM2.5 is more than 300, which leads to asthma in some patients with respiratory diseases. Placing an air purifier in the room can effectively reduce indoor PM2.5 concentration and reduce the impact of haze on health. When the air quality is not good, using the air purifier in the room is the main method to protect people from haze.

At present, the mainstream air purifier on the market is passive adsorption filtration type. The working principle of passive air purifier is mainly to use fan to pump air into the machine and filter the air through the built-in filter screen, which can filter dust, eliminate peculiar smell, and remove microorganisms.

What is the effect of air purifier?

The purification effect of the air purifier is directly related to the outdoor air. Because the outdoor air will enter the room through doors and windows, the indoor PM2.5 concentration is significantly related to the outdoor concentration. With high outdoor concentration, the more PM2.5 entering the room, the larger the treatment capacity of the purifier, the worse the purification effect and the shorter the service life. Because the principle of the air purifier is similar to that of the vacuum cleaner, it absorbs all the pollutants in the air into the purifier, most of which are on the HEPA network. The worse the air quality, the heavier the pollution, the faster the damage of HEPA network.

How to use air purifier effectively?

Nowadays, there are many kinds of air purifiers on the market with different functions. Many air purifiers have filtration effect, but some bacteria after filtration have not been killed. If bacteria that are not killed continue to grow on the screen, they will become a source of pollution.

The capacity of the filter screen of an air purifier is limited. In the case of serious air pollution, the filter screen will be saturated after several months of use, and it needs to be cleaned or replaced regularly. If it is not cleaned regularly and the humidity is appropriate, the bacteria will breed on the accumulated dust. At this time, the air purifier will not be effective, but become another source of pollution.

What kind of air purifier should I buy?

From the perspective of dust particle purification, the indoor dust particles are generally brought in from the outside, while the air purifier obviously has different standards in particle treatment, and the difference of particles will affect the purification quality of the air purifier; from the perspective of gas pollutant purification, due to the different types and severity of decoration pollution at home and abroad, the foreign purifier standards are aimed at the gas pollution Things will be different from home.

At present, due to the variety of air purifiers, consumers often do not judge. The basic principles of selecting air purifier are: first, innocuity, safety and effectiveness. The quantity of clean air must be considered in the process of purchase, and the blind method of removal rate must be prevented. Because of the influence of experimental cabin, operation time and natural attenuation, the removal rate is difficult to reflect the real ability of air purifier to remove pollutants.

What is the function of PM2.5 sensor in 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 - dust infrared 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 the light is directly proportional to the intensity of the electrical signal converted by photoelectricity. 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. The dust infrared 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. The dust particle counter is applicable to the automatic air monitoring system in the room, such as air purifier, fresh air system, etc.

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