[Repo] Purchase review of smartphone compatible CO2 sensor! It can help you work more efficiently at home
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Tweet from twitter@iPhoneMania_jpiPhone Mania September 1, 2021, 00:00 until read about 8 minutes 57 seconds New Corona In order to prevent the spread of viruses, it is said that it is necessary to improve closed spaces with poor ventilation, and the importance of indoor ventilation is attracting attention again. Carbon dioxide (CO2) concentration can be used as an index for this purpose. In addition, it is said that it is important to keep the CO2 concentration below a certain value for improving the efficiency of work at home in telework and improving the quality of sleep. I bought "sparoma PTH-8", a CO2 sensor that can easily check such CO2 concentration, so I will review it. The feature of this CO2 sensor is that it is compatible with smartphones, and it can be used to improve indoor ventilation more efficiently. I will also write about the results of actually improving the CO2 concentration at my home using this CO2 sensor, so please refer to it.CO2 is a substance contained in the air on the earth, and it does not affect the human body at low concentrations. However, if the concentration of CO2 becomes too high, it can cause headaches, dizziness, nausea, loss of consciousness, and even death from CO2 poisoning. In recent years, the concentration of CO2 in a room has attracted increasing attention, and the popularity of CO2 sensors that can measure it has also increased. There are three main reasons for its popularity.
The first reason is the new corona countermeasures. One of the risk factors for the spread of new coronavirus infection is a closed space with poor ventilation. In the proposal of the 4th Novel Coronavirus Infectious Disease Countermeasures Subcommittee held on June 16, 2021, "Thorough ventilation using a carbon dioxide concentration measuring instrument" was shown, and the concentration of indoor CO2 It is recommended to make sure that does not exceed 1,000ppm. For this reason, it seems that the introduction of CO2 sensors is increasing, mainly in restaurants.
![[Report] Smartphone compatible CO2 sensor Purchase review! It may be useful for improving the efficiency of work at home</p><p>Telework is recommended as a countermeasure against the new coronavirus, and some people may actually be working from home. If you're feeling sleepy while teleworking, it could be because the CO2 levels are too high. <b>When the concentration of CO2 in the room is high, it is likely to cause a decrease in thinking ability and drowsiness, and may even cause symptoms such as headache</b>. For this reason, it is recommended to keep the concentration of CO2 below a certain value in order to increase the efficiency of work at home. However, in order to work in a quiet environment as much as possible, many people may actually be working with the windows and doors closed. In order to improve the efficiency of telework, it is better to ventilate appropriately while checking the CO2 concentration using a CO2 sensor instead of always closing the room.</p><p>It is said that the concentration of CO2 affects the human body not only while we are awake, but also while we are asleep. One study found that <b>sleeping in a room with high levels of CO2 disrupted REM sleep cycles</b>. Also, high concentrations of CO2 make you feel drowsy and sluggish, making it difficult to wake up comfortably in the morning. It may be possible to improve the quality of sleep by measuring and improving the concentration of CO2 during sleep using a CO2 sensor.</p><p>I also wanted to check and improve the concentration of CO2 in my home, so I actually purchased a CO2 sensor. I bought a product called sparoma PTH-8.</p><p>The feature of this product is that it can <b>work with iPhones and Androids</b>. As mentioned above, due to the increasing attention to CO2 sensors, various products are being sold, but most of them only support the display of CO2 concentration on their own and cannot be linked with smartphones. . However, <b>in order to improve the CO2 concentration in the room, it would be more convenient to refer to the past history and receive a notification on the smartphone when it exceeds a certain value</b>, so we chose this product. I called. The price is a little higher at 12,900 yen (tax included), but I think it's worth it. <b>The connection with the smartphone uses Wi-Fi instead of Bluetooth, so you can check the CO2 concentration even when you are away or on the go</b>. For example, it will be useful when you leave your children or pets at home and go out.</p><p>sparoma PTH-8 uses the NDIR sensor. In order to measure carbon dioxide, which is colorless, odorless, and invisible to the naked eye, the mainstream technology uses infrared sensors, and the NDIR method achieves long-term stability and high measurement accuracy. <b>The Ministry of Health, Labor and Welfare also recommends that the NDIR sensor is](https://website-google-hk.oss-cn-hongkong.aliyuncs.com/drawing/article_results_9/2022/3/29/240180f2b2374256fbe25dd2c902a3f9_12.jpeg)
for measuring CO2 concentration.
The main body is small with a diameter of 9 cm to 10 cm, so it can be placed anywhere. The LCD screen is large and bright, and the concentration of CO2 is displayed in a particularly large size. There is also a function to measure and display temperature and humidity, but these are displayed small towards the bottom. In addition, LEDs are embedded in the upper part of the main unit, and if the concentration of CO2 is 700ppm or less, it will glow green, if it is 1,500ppm or less, it will glow yellow, and if it is above 1,500ppm, it will glow red. Even if you are far away and cannot read the numbers, you can grasp the current concentration of CO2 by color, which is convenient. The facial expression displayed on the display changes in conjunction with this LED. On the back side there is a USB port for charging, two buttons, and a stand. This product has a built-in Lithium-Ion battery that can nominally run on the battery for 22 hours. As a result, you can move it easily to measure CO2 concentrations in different locations. However, it is a bit disappointing that the terminal for this charging is micro USB instead of USB-C. Two buttons are used for various settings, such as turning off the display backlight or turning on/off the buzzer that sounds when the CO2 concentration is above 1,500pm. Also, NDIR type sensors have the problem of errors (drift) appearing during use, but sparoma PTH-8 can be manually calibrated by button operation.
Accessories are very simple. Only a USB cable and various manuals are included. I use an app called Tuya Smart to link with my smartphone. This app serves as a hub for various smart devices, one of which is sparoma PTH-8. The setup was very simple, and I was able to easily follow the instruction manual using my iPhone. I don't have any other Tuya Smart compatible devices at the moment, but sparoma PTH-8 alone can send a notification to your smartphone when the CO2 concentration exceeds a certain value . It seems to be useful for manual ventilation when the CO2 concentration is high.
When I measured it using my smart plug, sparoma PTH-8 consumes about 1.2W (including the separately prepared USB AC adapter). Assuming that the electricity bill is 27 yen per 1 kWh, the daily electricity bill for sparoma PTH-8 is about 0.7 yen, which means that even if you leave it on all the time, you won't notice it. > Isn't it possible to say?
I actually measured the CO2 concentration in my house using sparoma PTH-8.
Before that, I measured the outdoor CO2 concentration to check the CO2 concentration measurement accuracy of sparoma PTH-8. The outdoor concentration is said to be about 400ppm, but the measurement result of sparoma PTH-8 shows 453ppm, which seems to be at least practically acceptable.
Since I found that there is no problem with the accuracy, I will check the CO2 concentration at home. First, I checked the CO2 concentration in the room where I worked. As a result, it was found that I was working in an environment with a fairly high CO2 concentration of 1,451ppm. The standard for good ventilation provided by the Ministry of Health, Labor and Welfare is 1,000ppm, so the CO2 concentration greatly exceeds this. Work efficiency may be reduced by this.
Next, I measured the CO2 concentration in the bedroom. In order to monitor the CO2 concentration while sleeping, the smartphone link function that can graph the past CO2 concentration is useful. As a result, we found that the highest CO2 concentration reached 3,609ppm. CO2 concentrations above 2,000 ppm are said to cause headaches, drowsiness, fatigue, inattention, increased heart rate, and nausea, so there is no doubt that current CO2 concentrations affect the quality of sleep.
Since I found out that the CO2 concentration in my house is quite high, I decided to take measures.
The cause is still insufficient ventilation. Especially in cold and hot seasons, people tend to neglect ventilation in order to turn on the air conditioner. Considering the individual rooms, for the work room, the reason is that all the windows and doors, including the 24-hour ventilation air intake, are closed. This was done to increase the efficiency of the air conditioner and to create a quiet environment as much as possible. However, it is believed that there was little ventilation and high CO2 concentrations due to this. As for the bedroom, the windows and doors were closed, but the 24-hour ventilation intake was open. However, since several people were sleeping in a relatively small room, the ventilation could not keep up with the CO2 emitted by humans.
It would be best to open the windows for ventilation, but considering the air conditioner and crime prevention, I don't really want to do that. So, first, the 24-hour ventilation setting was changed to increase the ventilation volume. This should bring in more outside air and reduce the CO2 concentration. In addition, I opened the air intake for 24-hour ventilation in the work room. In addition, the filter attached to the 24-hour ventilation intake for pollen and dust countermeasures seemed to be clogged, so we are replacing it with a new one. One blind spot was the need to close the bathroom window. Our 24-hour ventilation system is located in the bathroom, but when the window in the bathroom is opened, most of the ventilation capacity is taken away by the window in the bathroom, weakening ventilation in other rooms. /b>. Since it is better to open the window of the bathroom in terms of removing the moisture in the bathroom, it may be better to open and close it as appropriate.
The graph below shows changes in CO2 concentration after these improvements. I move it to my work room during the day and to my bedroom when I sleep. First, we were able to keep the CO2 concentration below 676 ppm in the work room. The reason why it sometimes rises and falls is that the opening of the 24-hour ventilation intake is changed accordingly. I thought that if I left it open all the time, the efficiency of the air conditioner would decrease, so I adjusted it according to the CO2 concentration. It is possible to keep it at 400ppm to 500ppm by keeping the air intake fully open all the time. In addition, the bedroom was able to reduce the CO2 concentration to about 1,300ppm. Although we have not been able to reduce it to less than 1,000 ppm yet, we would like to keep it even lower through future improvements.
The sparoma PTH-8 has helped me to lower the CO2 concentration in my home, but there are some dissatisfaction points.
As I introduced above, sparoma PTH-8 can be linked with a smartphone to graph changes in CO2 concentration, but only hourly values are plotted >. If you could plot a little more detail, I think it would help us to understand the changes when opening windows and doors more clearly, which would be useful for improvement. By the way, although it is not written in the specifications, it seems that the main unit itself performs measurements in a fairly short period of about seconds. In addition, the display itself on the smartphone is said to be updated every 10 minutes. If so, I think it would be nice if the graph was at least 10 minutes. . .
sparoma PTH-8 can measure temperature and humidity as well as CO2 concentration. However, when connected to the USB and charged, the battery heats up and the temperature is measured very high. Humidity is also affected by it, so these functions are useless while charging. Temperature and humidity can also be displayed as graphs, but since charging is not recorded, strange results will be displayed. Also, if the NDIR type sensor uses the value of the temperature sensor for correction, the CO2 concentration may also be affected. Although it can't be helped that the battery is charging, it's a little disappointing.
Since this sparoma PTH-8 is compatible with the smart device hub Tuya Smart App, you can use the CO2 concentration measured by the sparoma PTH-8 for cooperation between smart devices. However, there are only a few types of smart devices available in Japan that are compatible with this app, and even if you search for products with "Tuya Smart" on Amazon, you will only find a limited number of products. . For example, I would appreciate it if we could automatically turn on the ventilation fan when the CO2 concentration rises, so I look forward to future developments.
As introduced so far, sparoma PTH-8 is a CO2 sensor with a function to link with a smartphone, and it is useful for improving indoor CO2 concentration. Compared to other CO2 sensors, it is a little more expensive, but I felt it was worth it. If you want to take measures against infectious diseases, improve the efficiency of your work at home, or improve the quality of your sleep, please try it. The sparoma PTH-8 is 12,900 yen including tax and can be purchased at Rakuten Market (at the time of writing this article, it is out of stock on Amazon).
Source: Amazon, PR TIMES, Cabinet Secretariat, Toyama Prefecture (Administrative contact from Ministry of Health, Labor and Welfare) (Hauser)
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