Air pollution detector. What is the difference between a gas alarm and an air pollution detector? Various design options

In any more or less large industrial city and its environs, the air is polluted large quantity suspended particles. And these are, for the most part, third-party substances that the industry works with, plus other man-made components, decay products formed during combustion, and so on.

In general, all this is very unhealthy, and in some cities people even have to wear protective masks, in the case of a particularly active phase of production and a certain configuration of the wind rose.

This solution is a small module for mobile phone, which evaluates air quality using the device's camera and flash. Of course, using the module on a phone without a camera and without a flash will not work.

The module itself is fixed on the back of the smartphone with a magnet, while the holes of the module should be located above the flash and camera of the smartphone.

Everything works quite simply. A person presses the “take a photo” button (while setting the flash mode), the flash fires, and the light from it enters the camera sensor via an optical fiber.

The module also has a passive air intake through which the light from the flash passes before reaching the camera lens. The more suspended particles in the selected air sample, the more light is scattered.

For their module (its case, by the way, was printed on a 3D printer), the scientists also developed a corresponding application that analyzes the images received by the camera, calculating the number of particles in the air from the brightness of the pixels in the resulting image. According to experts, the brightness of the pixels in the photo allows you to quite accurately calculate air pollution, for which a special algorithm was developed.

After testing their device, the scientists compared their own results of research on the state of the atmosphere with the results of studies of regular stations for determining air quality. The results agreed pretty well.

Of course, the device has its limitations. In particular, it can detect atmospheric pollution at a concentration of suspended particles up to about 1 milligram per cubic meter. In addition, particles smaller than 10 microns (and the fine dust fraction is the most dangerous, by the way) are also not yet detected by the device.

Now scientists are improving the characteristics of the device, so that it can take into account the fine fraction of dust.

According to the developers, their device can be useful to all people, users of mobile devices, who are concerned about the quality of the atmosphere in their city. With the help of such a device and an application to it, it would be possible to quickly map the air pollution of a city/region, after which the results would be provided to the relevant services.

The scientists' article is available at

I set up a station in my area, not far from the Universitet metro station. And data on the number of PM2.5 dust microparticles is now available to everyone. Ideally, you can announce crowdfunding and create your own network of stations throughout the city, but first things first. Go!

The photo below is my second AirVisual Pro monitoring station from IQAir Corporation. You should already be familiar with this device, which has no analogues on the market. I was the first AirVisual customer from Russia exactly one year ago. Then the station was called AirVisual Node and cost only $209 (now the upgraded version costs $269). The difference between the Pro version is a different, better screen, advanced settings and a different PM2.5 laser particle detector of the company's own design. concentration sensor carbon dioxide CO2 in both devices is the same - SenseAir S8 Extended Range (measurement range up to 10000 ppm). Also, the device is equipped with Wi-Fi, a 5-inch screen and a battery for autonomous operation (its charge is enough for 3-4 hours of operation, if desired, you can connect external power from a powerbank - this is how I took measurements in transport).

Surprisingly, in the world there are no analogues to this device in terms of the totality of characteristics. At the same time, it is worth noting that the station uses industrial-grade accuracy sensors (you can google tests in which the PM2.5 particle detector from AirVisual shows accuracy comparable to professional equipment costing several thousand dollars).

As I noted earlier, on September 11, 2017, the Mosecomonitoring website stopped working. More than 10 stations were installed in Moscow different areas cities, data from which was successfully picked up by both the AirVisual device itself and the mobile application (it is convenient to use even if you do not have your own station).

Okay, so we will monitor the pollution of street air on our own. Moreover, these measurements clearly show us that HEPA filtering of supply air really works. The screen on the left shows the level of PM2.5 particles in the bedroom (in fact, it is lower, it just introduces an error ultrasonic humidifier air, although it works on water from reverse osmosis with 9 ppm - I will write a separate article about this). That is, in reality, the average concentration of PM2.5 in the bedroom is 2-3 µg/m3. While outdoors at this very moment the concentration is 17 µg/m3. For healthy people it is almost safe, but sensitive people should avoid long walks and outdoor sports at this point. Allergy sufferers should also avoid prolonged exposure to the street if the AQI index exceeds 50.

I installed the station on the balcony, next to the permanently open window. In public access, it transmits only data on PM2.5. You can monitor the state of the street air either from the official website (https://airvisual.com/russia/moscow/universitet) or through the AirVisual mobile application. Of course, it's a little pity that the device in this form is not used at 100. In fact, the battery, screen, CO2 sensor, temperature and humidity sensors are idle. But, unfortunately, there are no other options on the market (in fact, there are, but costing several thousand dollars).

Here's another screenshot from my admin panel. Here you can see the very data on CO2, temperature and humidity from the street station, which are not in the public domain. And at the same time appreciate the highest air quality in our apartment. As I noted above, if you remove the humidifier, then PM2.5 will be 2-3 µg/m3. Well, 640 ppm CO2 is simply the highest air quality, which guarantees, among other things, the absence of formaldehyde and other pollutants.

If you want to learn more about what PM2.5 microparticles are, then I highly recommend reading this one. I see no reason to repeat and retell it again.

I will only point out important point why you need to watch out for PM2.5 particles. In fact, one of the best air quality detectors we all have is our nose. If you feel bad smell it is obvious that measures must be taken to prevent this from breathing. In the same way, your eyes will not fail you if you see a dense cloud of dust and promptly leave the place of pollution. The problem with PM2.5 particles is that they cannot be seen and felt in advance. Due to their microscopic size, they easily overcome biological barriers (the nasal mucosa) and settle in your lungs. And after that, with great difficulty, they are removed from there. Regular exposure to PM2.5 particles reduces immunity, increases the risk of developing chronic lung disease, and ultimately reduces life expectancy.

And now I have very important question, primarily to the residents of Moscow. There is a proposal to make your own urban air quality monitoring network based on such stations (last year such a project was implemented by enthusiasts in Krasnoyarsk - http://krasnoyarsknebo.ru). As I noted above, the station costs $270 with delivery to Russia. Volunteers are needed who will agree to install stations on their balcony and provide a network connection (USB 5V 1A is enough) and the Internet (via Wi-Fi). As well as people who are ready to donate a small amount of money for the development of the project (purchase of stations, creation of a website and mobile application, health support). Of course, in Moscow the air is not as dirty as in other megacities of the planet (look at the AQI index in India and China, for example -.

UPDATE FROM AUGUST 20, 2018:
The station has been dismantled, and observations of the state of air in the area are not carried out.

Do you have any questions? Ask them in the comments!

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The level of human comfort and safety depends on the microclimate where people spend most of their lives, namely: at home, in the office and in the office. Atmospheric pollution, the reduction of green spaces, the use of synthetic materials worsen the composition and properties of the inhaled air mixture. In our country, there are regulatory documents that responsible owners of industries and companies must adhere to. In order to have an idea about the composition of the air mixture, devices and detectors have been developed that determine the state of the atmosphere for the presence of dust, the content of harmful substances, and the deviation of the parameters of the air mixture from the standard characteristics.

Scope of gas analyzers

A very important field of application of gas analyzers is the control of air purity in the offices of the building, which is understandable, because the owner of a small company, office or cinema will not be able to influence the city air. In the office, taking into account modern possibilities, you can create an acceptable atmosphere by installing ventilation system, which will work in the desired mode, taking into account the state of the air mixture, which allows you to create an optimal atmosphere in the office space. Sanitary standards establish special air characteristics, which include temperature, humidity, concentration of carbon dioxide, ozone, volatile organic compounds, smoke and dust. The efficiency and speed of reading depends on the accuracy of the air quality sensor. When there are many people in the building, the gas analyzer must quickly measure the state of the air mixture, on its commands, the supply of clean air must be more intensive. If there are few or no people at all, the feed should be reduced until it stops completely.

Indoor carbon dioxide analyzers

One of the main parameters that characterize the optimal composition of air is the concentration of carbon dioxide. When a person enters the office and notes that it is stuffy, this most likely indicates an increased content of carbon dioxide. When inhaling air, where the carbon dioxide content is higher than the recommended values, the body feels discomfort, the person feels tired, becomes inattentive and distracted. When a significant number of people are in the office, when they all exhale carbon dioxide, the room becomes stuffy, so the main criterion for a poor composition of the air mixture is the content of carbon dioxide in it, which indicates the need to ventilate the office. Tracking the content of carbon dioxide in the air allows you to control the state of the atmosphere in the building. To do this, air quality sensors are used that monitor the level of carbon dioxide, they are produced by various companies, there are many models that differ in price and characteristics, and various options for their placement are offered.

Room detectors

The carbon dioxide monitoring of the Arduino room air quality sensors is based on the attenuation of infrared radiation as the amount of carbon dioxide increases. The measurement is carried out with an infrared analyzer. Room air analyzers provide the ability to individually adjust the supply of external air if necessary to refresh the office, ensure that the air condition meets the standards, reduce energy costs, since the supply is carried out at the right time. Many models of room air quality sensors are produced, and there are many types of wall-mounted devices. Of the room air monitoring detectors, two types are most widely used:

1. Carbon dioxide detector with relay output, ventilation system control buttons, LED indication.
2. Detector without indication and control buttons. The analyzers show the content of carbon dioxide in the room, when its concentration is exceeded, the employee independently turns on the ventilation and provides an influx of clean external air. All detectors can measure the amount of carbon dioxide, monitoring the limits, the measurements usually have the following ranges:

• From 0 to 0.02%.
• From 0 to 0.03%.
• From 0 to 0.05%.
• From 0 to 0.1%.

The received data is converted into active output signals to the monitor, it is possible to use an analog data output that carries information about the concentration of carbon dioxide. State standards the permissible concentration of carbon dioxide in the air and the performance of the ventilation system, which depends on the number of people, are regulated. According to the standard, one employee must have at least thirty cubic meters of fresh air per hour. The room air quality sensor must, in accordance with regulations, be installed at a distance exceeding one meter from the permanent location of people, but not closer than one meter to supply ventilation.

Automatic sensors for ventilation

Air quality sensors for ventilation are used to automate the operation of the supply and cleaning system. These devices are connected to ventilation control devices and, if the parameters deviate from the specified ones, automatically regulate the oxygen supply. Automation of ventilation systems makes it possible to maintain the condition of the air in the room at an optimal level, eliminating the human factor. Air quality sensors built into the ventilation system also save energy, since air conditioners and ventilation systems do not work constantly, but only at the time set by the program. Analyzers can be connected to humidification or ozonation systems. The technology of operation of the device is that through the relay the sensor turns on the ventilation system only when an excess of carbon dioxide concentration is noticed.

Gas analyzer SQA

In addition to carbon dioxide, other gases and smells can soar in the house. In order to monitor the quality of inhaled oxygen and the increase in the concentration of certain gases, gas analyzers were developed. They are able to control the characteristics of the air mixture. The SQA air quality sensor monitors the concentration of not a single element of the atmosphere, carbon dioxide or another single gas, it turns on ventilation when organic substances are detected that change the composition of the atmosphere depending on the parameters embedded in the device. After the office microclimate parameters reach the norm, and the air mixture acquires the necessary characteristics, the air supply from the outside will continue for some more time, set by the timer, up to twenty-five minutes. The control device can be set to the specified air parameters, if it deviates from them, it turns on the forced supply of the air mixture until the optimum composition is reached.

Arduino Air Pollution Control Detector

The environmental protection organization has identified the main five air pollutants, these include nitrogen oxide, sulfur dioxide, carbon monoxide, ozone, and particulate matter. The Arduino Air Quality Sensor is an optimal and very cost-effective way to monitor air quality, it can detect major pollutants other than sulfur dioxide. The device also has a particulate, humidity, temperature detector and a gas analyzer, which makes it possible to detect leaks and the presence of other combustible hydrocarbons in the air. Air quality sensors start ventilation automatically to clean the building. This happens if there is an excess on any given parameter.

VOC air quality sensors

The abbreviation VOC stands for Volatile Organic Compounds. The VOC air quality sensor evaluates the composition of the mixed air by the mixed gas analyzer. It monitors the concentration of the available mixture, determines the state of the air, allows you to quantify its saturation with various gases, cigarette smoke, gasoline vapors, solvent, paint. This sensor is self-calibrated, controlled by a microprocessor, the excess concentration of harmful impurities is detected using a chemical sensing element that reacts with organic impurities of air pollutants, which leads to a change in its electrical conductivity. It is measured by instruments and converted into digital form. Sensitive chemical element during operation of the device is consumed, its service life depends on the type of pollutants and their concentration.

KNX air condition detectors

KNX is an automated building maintenance system that is standardized and uses a single software. Automation of home management using the system allows significant energy savings, for example, the use of comprehensive building maintenance for ventilation control can provide energy savings of up to forty-five percent. When using the KNX system, air quality sensors control the ventilation of the entire building. Detectors for other functions, heating, blinds, lighting are also connected to the control devices of these systems. The essence of the microclimate control scheme in the building is to measure the air quality control sensors, fix the current readings and transfer them to the microclimate control system, which regulates the supply or interruption of the supply fresh air in one room or another.

Devices for the detection of pollen

There are now a range of indoor air quality sensors available that can detect the presence of pollen in the air. Such devices determine the degree of pollution of the atmosphere by particulate matter. Manufacturing companies have developed and are implementing devices for determining the amount of dust and pollen, capable of distinguishing particles up to 2.5 microns in size using optical methods and using a laser beam. Particles of this size are considered serious and dangerous air pollutants, in Japan and China they are considered an important factor in the growth of diseases. Pollen and dust are especially dangerous for those suffering from asthma, chronic pneumonia, cardiovascular diseases during seasonal flowering of plants. The optical method consists in the fact that the light scattered from the particles is collected by a system of mirrors. Sensor developers believe that the device is able to distinguish dust particles from pollen by analyzing characteristics scattered light. Detectors that use an optical method to control the concentration of dust and pollen in the air, show the amount of particles suspended in the air. The device using a laser beam to determine the amount of particulate matter in the air adopts the method of directing a laser beam into the air, by scattering the returned beam, the concentration of particulate matter suspended in the air is determined.

Pollen Air Purifiers

People could not stop at determining the degree of pollution and developed devices for cleaning the air from impurities. Good inventions for air purification need to perform at least two tasks: to maintain the optimal condition of the air by ventilation, to clean it from suspended particles, as well as harmful gases. These appliances must be equipped with filters that must trap dust, pollen and other particulate contaminants. The principle of cleaning is to drive the air mixture by the fan of the device through a set of filters, which allows for quick cleaning of large rooms.

Many models are equipped carbon filters, which capture most of the carcinogenic substances, gases, eliminate odors, tobacco smoke, sometimes models are additionally equipped with air ionizers. There are also air quality instruments with pollen sensors. According to the cleaning methods, the following types of cleaners can be distinguished:

• An electrostatic cleaner cleans with ionized air. It effectively captures dust, soot and tobacco smoke. Equipping with an ozonator helps to regulate the number of microbes and bacteria. The device is easy to maintain, consumes little electricity, is inexpensive, does not require consumables, you only need to periodically remove the accumulated dust.
• Cleaners with replaceable filters are very effective against dust. They are inexpensive, but filters need to be replaced periodically.
• Photocatalytic purifiers are considered the most efficient, cleaning is done by decomposing a solid air substance under the action of ultraviolet rays and a catalyst. Effective also against odors and smoke. These devices do not need consumables, but have a rather high cost.
• Purifiers using water. Devices of this type usually combine both a humidifier and an air purifier.

Often a manufacturer has to fit a whole combination of different ways cleaning, which increases the efficiency of the device. The choice of such a device should be made taking into account the area of ​​\u200b\u200bthe house, the amount of dust, the presence of smokers, as well as the price and manufacturer. Man has invented many ways to detect pollutants and control the condition of indoor air, and more will be invented. However, after all, one should not forget about the elementary, centuries-old methods of dealing with dust, dirt and odors, this is a systematic wet cleaning and dust removal.

In modern living quarters, complex automated monitoring of the state of conditions of stay in office premises is used, which automatically allows you to respond to changes in the characteristics of the microclimate in buildings. But in old buildings, ventilation is rarely equipped with at least coarse filters to clean the incoming air from large dust particles. In order not to jeopardize the health of personnel, experts recommend installing local systems for maintaining the microclimate in the premises. An air quality switch sensor can help with this.

This device will provide users with a cost-effective air quality monitoring solution. Environmental organizations have identified five major air pollutants: ozone, airborne particulate matter, carbon monoxide, sulfur dioxide, and nitrous oxide. This device can detect all of these pollutants except sulfur dioxide. In addition, the device includes a gas detector to warn users of gas leakage or the presence of combustible gases. Also included is a temperature and humidity sensor.

We calibrated the device according to the datasheets of the sensors for preliminary assessment overall performance of the device. Since the sensors used are quite cheap and their parameters vary significantly from component to component, they were calibrated at a predetermined concentration of harmful gases.

Step 1: Materials

Management and nutrition

• Microcontroller Arduino Uno
• 5V power supply
• RGB 16x2 LCD shield

Sensors

• Particulate matter sensor Shinyei PPD42
• Gas sensor MQ-2
• Gas sensor MQ-9
• Gas sensor MiCS-2714 (NO2)
• Gas sensor MiSC-2614 (Ozone)
• Keyes DHT11 temperature and humidity sensor

Additional materials for assembly

• Access to a 3D printer
• Bread board
• 5V fan
• 10 - 15 24 gauge conductors (0.511 mm)

Step 2: General Wiring Diagram

The above wiring diagram is a general diagram showing the operation of a harmful gas detector. The detailed wiring diagram for the breadboard will be shown below. Please note that you can change most of the digital and analog ports that the sensors connect to if necessary (for whatever reason); To do this, you need to make changes to the provided program code.

Step 3: Particulate Sensor

We used two Shinyei PPD42 dust sensors to collect data on the concentration of particulate matter in the air.

Each Shinyei sensor has two signal outputs: one for fine particulate matter (left yellow wire in the image above) and one for large particulate matter. These outputs are connected to the digital inputs of the Ardiuno. The sensor ports require a +5V power supply and ground. see general wiring diagram.

Each sensor uses an infrared LED and a photodiode to measure the concentration of airborne particulate matter. Internal circuitry converts the output of the photodiode into digital signals. Normally, the output of the sensor is +5V, and when the sensor detects particles, it sends out a low voltage pulse. The period of time the output is low, or the "low-pulse occupancy percentage" (percentage of time the photodiode output is low) is proportional to the concentration of particulate matter in the air.

A detailed analysis of the reverse decoding of the Shinyei PPD42 sensor is indicated in educational material Tracey Allen

Step 4: Gas Sensor PCB

The wiring diagram for printed circuit board gas sensors and temperature/humidity sensor. Details for installing each component are listed below in the following steps. Please note that your circuit board may differ physically from the one shown in the image. In fact, it is recommended that you make your own PCB for surface mount components, instead of using a breadboard.

Step 5: Ozone and NO2 sensors

We used surface mount sensors MiCS-2614 and MiCS-2714, which can detect ozone and nitrogen dioxide in the air, respectively.

Both of these sensors use an internal resistor in their sensor element. In the diagram above, the measuring resistor is located between terminals (G) and (K). Use an ohmmeter to check for correct pin assignment. The resistance of the resistor should be in the range of 10-20 kΩ.

In addition, both sensors are equipped with a heating element between terminals (A) and (H). The a heating element maintains the required temperature of the sensor element. The resistance of the heating element is 50-60Ω.

Ideally, both sensors should be surface-mounted on the PCB. However, in the absence of a printed circuit board, carefully solder to the outputs of these sensors using low-temperature solder and take extra care.

As shown in the wiring diagram for the breadboard, we installed 82Ω and 131Ω resistors in series with the heating elements of the MiCS-2614 and MiCS-2714 sensors, respectively. This ensures that the heating elements receive the required power level. If you don't have a 131Ω resistor (which is non-standard), then use 120Ω and 12Ω resistors in series.

We placed the measuring resistors in both sensors in series with the 22kΩ resistors to create a voltage divider. From the voltage at the output of the voltage divider, we were able to calculate the measuring resistance of the sensor.

Rsenor = 22kΩ * (5V/Vout - 1)

Step 6: MQ Toxic Gas Sensors

We used gas sensors to measure toxic gases including propane, butane, LPG and carbon monoxide. MQ-2 and MQ-9.

MQ-2 and MQ-9 are very similar to MiCS sensors. They use a gas sensing resistor (SnO2) to detect toxic gas concentrations and have a heating element to keep the sensor at the desired temperature. The circuits used for these sensors are similar to those for the MiCS sensors, except we used a transistor instead of a resistor to control the heating power in the MQ-9.

Refer to the wiring diagram for the breadboard for detailed wiring information. For the MQ-2 sensor, connect the pin labeled A to the 5V supply, the pin labeled G to ground, and the pin labeled S connect to ground through a 47 kΩ resistor. For the MQ-9 gas sensor, connect the pin marked A to the transistor, the pin marked B to the 5V supply, the pin marked G to ground, and the pin marked S connect to ground through a 10 kΩ resistor.

Step 7: Temperature and Humidity Sensor

This sensor must be used because the control of temperature and humidity plays an important role in determining the concentration of gases. High humidity and temperature significantly affect measurement accuracy. Therefore, it is very important to control these changing parameters. Temperature and humidity can be controlled simultaneously with a single sensor. As shown in the image above, the left pin is connected to power, the middle pin is the signal output, and the right pin is connected to ground. The output signal from this sensor is fed to the Arduino digital port. Our code assumes that the temperature signal is received on digital port 2. If necessary, you can change to another digital port; you just need to make appropriate corrections in the program code depending on the selected port. For proper use of this component, refer to the wiring diagram for the breadboard.

Step 8: Power Supply and Fan

If you look at the wiring diagram for the entire project, you will see that you only need one input voltage of 5V. For this project, you can use the normal network adapter shown above. In addition, you will need a case fan to help prevent the device from overheating. You can use a standard 5V fan of the required size.

Step 9: Body

The body can be made in many ways. We used UP 3D printer. We have attached the STL file that we used for the final print.

Step 10: Program Code

The code for extracting raw data from the device is attached above. This code prints out the sensor resistance values, Shinyei PPD42 low pulse signal occupancy percentage, and temperature and humidity readings on the computer via the serial monitor. Also, the raw data can be viewed on the LCD display.

For the code to work correctly, you first need to load the libraries for the LCD shield, and temperature and humidity sensors. Libraries can be found on the following websites:

Step 11: Data Interpretation

We used David Holstius to determine the particulate concentration. In the article, for the Shinyei PPD42 dust sensor, the ratios of sensor outputs and measurements taken by the Environmental Protection Agency were determined. The charts in the application indicate the most appropriate plots for the data. We used graphs to approximate PM2.5 particulate matter concentration in micrograms per cubic meter as follows:

PM2.5 = 5 + 5 * (small percentage of the time the photodiode output is low).

To evaluate the gas concentration from the MiCS gas sensors, we used the graphs in the datasheets (NO2 and ) to extract features regarding the resistance of the sensor with respect to gas concentration.

For MQ sensors, we used graphs from sensor datasheets to qualitatively evaluate the data. When the resistance value falls below half of the resistance in air, it is likely that the sensor is detecting the target gases. When the resistance drops by a factor of 10, the target gas levels will be in the region of 1000 ppm, which is close to the required safe limit.

Oxygen is the source of life. Unfortunately, today the environment is not in a very good condition. We are forced to inhale a lot of harmful substances and elements along with oxygen. This can lead to various diseases and negatively affect your health.

Many people think that there is no way out, because to refuse oxygen consumption means to find oneself to perish. First of all, you need to have an idea about the current situation. As the saying goes: "Forewarned is forearmed." An air analyzer will help you with this.

Air analyzer in the apartment

There are many devices that allow you to purify the air in the room. The air analyzer in the apartment will indicate to you the presence of not only harmful substances, but also household pollution. Dust, aerosol vapors, exhaust gases entering the room through opened window, all this can get into your respiratory tract throughout the day. And if it will be problematic to purify oxygen in an open area, then it will be much easier to do it in an apartment.

You can easily connect an air analyzer for the presence of harmful substances to your air purifier. This will automate the operation of devices, and as soon as the air composition on the analyzer exceeds the norm, the purifier will immediately start cleaning. Such a system will save energy, because the purifier no longer needs to work around the clock. And the devices themselves will last much longer. Anyone who cares about their health should buy an air analyzer in an apartment.

With the Xiaomi air analyzer, you can find out the environmental situation in any place and area of ​​the city. For example, it will be easier for you to choose an area for a morning run or a walk with a child. The accessory is light and convenient, and it will be easy for you to take it with you.

In the instructions, you will find the code for the application, with which you can control the device from your smartphone. The accessory has a square shape, its dimensions are slightly larger matchbox. The black LCD display and white body make the device attractive. appearance. Buy an air analyzer and, by connecting it to your smartphone, you can control the device from a distance.

Air analyzer for the presence of harmful substances

Remove the protective film and start the device by pressing the button on the top panel. After a few seconds, the air quality analyzer will display readings and the light sensor will indicate the oxygen quality.

A green signal means that the concentration of harmful substances does not exceed the norm. Orange indicates medium pollution. Red indicates a hazardous atmosphere.

Also on the screen will be indicated indicators of harmful substances in digital terms. The norm is from 0 to 77, medium pollution is from 76 to 150 and high pollution is from 150 to 600. Just below the digital indicators, you can see the degree of battery charge of the room air analyzer, the Wi-Fi operation icon and the model name PM2.5.

The back panel of the instrument for measuring air purity is made in the form of a grid. It is through it that a portion of oxygen enters the household air analyzer to determine the MPC. Inside is a high-precision laser that measures the presence of particles.

The portable air analyzer has an input for a charger and Wi-Fi. With the air pollution analyzer app, you can use your device as a conventional watches. To do this, you just need to launch the application and press the button on the top panel of the case.

Also, using the application, you can adjust the backlight intensity of the air quality analyzer for the home. The smart home function will help synchronize your air conditioner and humidifier with the analyzer. You can always view the history of the airborne dust analyzer through the app.

Buy an air analyzer for the presence of harmful substances, and you will appreciate all its advantages. The device will track the concentration even when you sleep. If what you breathe matters to you and you want to manage the situation yourself, then you simply need to buy an air pollution analyzer.

Xiaomi air analyzer. Advantages

• Continuous operation of the battery lasts for 3 hours;
• Can work both independently and through the application;
• Determines the percentage of dust, soot, ash, sulfates and nitrates in the air;
• Shows air quality in real time;
• A great gift for a person leading a healthy lifestyle.

Outdoor and indoor air quality analyzers have only recently begun to be produced. Some 2-3 years ago, in order to make a similar measurement of MPC, it was necessary to use professional devices. Unfortunately, they are not available to everyone. With the help of an analyzer of harmful substances in the air, anyone can independently determine their concentration.

And if it is not always in our power to solve the problem of air pollution, then it is in our power to determine where it will be safe for health, and in which places it is better to minimize stay. Since mankind cannot create normal conditions for existence, it is necessary to at least avoid exceeding the norm of harmful substances. The price of an air analyzer in our online store is much lower than in specialized equipment stores.

Characteristics

• Display: OLED;
• Detectable particle size: 0.3μm;
• Laser sensor;
• Body material: ABS plastic;
• Working time: 3 hours;
• Power type: built-in battery;
• Size: 6.2 x 6.2 x 3.7 cm.

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