Why And How To Detect The CO2 Concentration

2022-11-04 Products News MFrontier Editorial department



In 1756, Scottish chemist Joseph Blake was the first to quantitatively study the carbon dioxide gas he called "fixed air." Since then, scientists have been looking for ways to measure this gas.


One of the earliest carbon dioxide measuring devices was the mercury manometer. A manometer uses a U-shaped glass tube filled with mercury to measure gas pressure. If the temperature, pressure, and volume of a gas sample containing COmolecules are known, the number of moles of COcan be calculated using the ideal gas law PV=nRT.


Although mercury manometers can measure gases very accurately, the measurement process can take several hours. Then, people invented  infrared (IR) gas analyzer for calibration. It was accurate and efficient, but it was bulky. The sample tube alone was 40 cm long. On the one hand, a longer optical path is needed to more accurately measure lower levels of CO, which means a larger gas sampling chamber; on the other hand, in environments such as schools, offices, homes, and cars, smaller gas sampling chambers are needed. The sensors are installed in compact equipment for detection.


As a result, small COsensors came into being.


MFrontier carbon dioxide sensor adopts the NDIR non-dispersive infrared technology principle, which uses the phenomenon that CO2 molecules can absorb infrared rays with a specific wavelength of about 4.2 µm to detect gases and accurately calculate the concentration of CO2 gas.


Features


  • No oxygen dependenc

  • Strong adaptability to complex environment

  • Strong anti-interference ability

  • High sensitivity, high resolution, low power consumptio

  • Built-in temperature compensation, high detection accuracy

  • Multiple ranges optional, full range linearization, digital outpu

  • Good stability and long service life

 


Parameters


Model

MTP60-F

 single channel NDIR gas sensor

MTP80-A

dual channel NDIR gas sensor

Detect ga

carbon dioxide

Measuring principl

NDIR

Measuring concentration range

400~5000ppm

Measurement interval

2s

Measurement accurac

± (50ppm + 5% of reading

Response tim

T90 time is 90s

Supply voltag

4.2V~5.5V

Supply current

300mA peak current

4mA normal operating current

13mA average operating current

Output signal

Uart /IIC

Environmental conditions

0~50°C;0~90% RH(non-condensation

Life span

≥10years



Tips


 

Carbon dioxide, methane, nitrous oxide, etc. are all greenhouse gases, but carbon dioxide plays the greatest role in climate change.

In the 21st century, human life patterns have changed. In order to isolate themselves from noise and enjoy the comfort and convenience brought by air conditioning systems in living spaces, offices, cars, etc., people keep their windows closed for a long time, so that the indoor carbon dioxide concentration is much higher than the average outdoor level. Indeed, there are medical reports that sleeping in an air-conditioned room for eight consecutive hours will cause symptoms of Sick Building Syndrome such as nasal congestion and red and itchy skin in the morning due to adequate air convection, which helps dust mites breed.

 

When the concentration of CO₂ reaches 1%, people will feel shortness of breath, dizziness, and heart palpitations. When it reaches 4% to 5%, people will feel asthma, headache, and dizziness. When it reaches 10%, it will cause serious confusion of human body functions, causing People lose consciousness, become confused, stop breathing and die.

The harm of carbon dioxide to the human body cannot be ignored. The use of sensors can help humans accurately measure the CO₂ concentration in the space where they live, provide early warning, and protect the safety of people's lives and property.


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