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Rika Sensor is a weather sensor manufacturer and environmental monitoring solution provider with 10+ years of industry experience.

Regarding the indoor CO2 exceeding the standard, the carbon dioxide sensor has something to say

by:Rika Sensors     2021-11-27
Regarding the indoor CO2 exceeding the standard, the carbon dioxide sensor has something to say
Generally, when talking about air quality issues, everyone habitually focuses on PM2.5, but in fact, excessive carbon dioxide is also a hidden danger in the air. Regarding this statement, many consumers may be surprised to know that carbon dioxide occupies a considerable proportion in the environment and also plays an important role in human body mediation. How can it become an air tumor and harm human health?

First, we must start with the carbon dioxide in the air. As we all know, the proportion of oxygen and carbon dioxide in the atmosphere is relatively stable, with oxygen accounting for 21% and carbon dioxide accounting for 0.03%. Carbon dioxide itself is not toxic, but when the carbon dioxide content in the air exceeds the normal level, it will have an impact on human health.

Then why is there a lack of oxygen if there is too much carbon dioxide? Because when people breathe, they absorb oxygen and exhale carbon dioxide. With more carbon dioxide, the oxygen content in the air will decrease accordingly, and people have become accustomed to the oxygen content in the living environment. When the indoor carbon dioxide concentration exceeds the standard, resulting in insufficient oxygen absorption, it will naturally lead to people's unsuitability, causing people to breathe unsmoothly and other symptoms of hypoxia. This shows that we must understand the indoor carbon dioxide concentration standards and adjust them in time.

Currently, there are three common standards related to indoor carbon dioxide content: The first is 'Indoor Air Quality StandardsSecondly, it is the 'Hygienic Standard for Carbon Dioxide in Indoor Air' GB/T 17094-1997. Finally, it is the 'Public Places Sanitary Indicators and Limits Requirements' GB 37488-2019. The first two standards are national recommended standards, and the latter standard is national mandatory standards. Next, I will explain in detail what are the specific regulations of the three standards:

'Indoor Air Quality Standards'

'Indoor Air Quality Standards\%, the source of the inspection standard is 'Public Place Hygiene Inspection Methods Part 2: Chemical Pollutants' GB/T 18204.24. The inspection methods are: non-spectral infrared gas analysis, gas chromatography and volumetric titration.

'Hygienic Standard for Carbon Dioxide in Indoor Air'

It is mentioned in 'Hygienic Standard for Carbon Dioxide in Indoor Air' that the standard value of indoor carbon dioxide CO2 is ≤0.10% (2000mg/m), and the inspection principle is specifically listed in the standard. According to Beer's law and the principle of selective absorption of infrared light by carbon dioxide. The inspection instrument is: carbon dioxide sensor.

'Public Places Hygiene Indicators and Restrictions Requirements'

'Public Places Hygiene Indicators and Limits Requirements' stipulate that for public places that require sleep and rest, the indoor carbon dioxide CO2 concentration should not be greater than 0.1%; others In places, the indoor carbon dioxide CO2 concentration should not be greater than 0.15%. The source of the inspection standards is based on the 'Public Place Sanitary Inspection Methods' GB/T 18204.

In addition, it should be reminded that there are two measurement methods for carbon dioxide content: one is 0.10%; the other is 1500mg/m3. Percentage can be converted into ppm, and ppm means a few percent, so 0.10%u003d10000ppm. And mg/m3 stands for milligrams/cubic meter, which can also be converted into units of ppm, but it also involves the molecular weight and temperature of carbon dioxide and other influencing factors.

The concentration of indoor carbon dioxide should be kept below 1000ppm or 1500mg/m3. When in a suitable and concentrated environment, indoor personnel will be in a state of breathing smoothly and flexible in mind. Being in such a good environment for a long time will undoubtedly have great benefits to your health, and it will also help you work or study.

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