Winsen CO2(Carbon Dioxide) Sensor Selection Guide
CO2 concentration Vs. Indoor air quality
CO2 concentration is regarded as one of the most important indicators of air quality in buildings. Closed spaces have increased CO2 concentration than outdoor due to the lack of air exchange. Long stay in such places will cause feeling of dull, dizzy, headache and unable to concentrate. High concentration of CO2 will damage the body, lead to coma or even death. It can also be taken an indicator of air pollution from other possible harmful gases, virus, flu depending on different occasions. Indoor climate plays a key role in health protection, as pathogens remain in rooms for hours at typical air exchange rates in residential and office buildings. An increase in fresh air supply is recommended. The WHO also indicates that CO2 monitoring helps to reduce the Risk of Covid-19 Transmission Indoors.
The amount of CO2 in an air is expressed as parts per million (ppm) – the number of CO2 molecules per million molecules of air.
- 400 ppm: average outdoor air level.
- Below 700ppm: the air is fresh, and people will feel comfortable.
- 700ppm to 1000ppm: the air is still normal although light polluted.In US standard.
- 1500ppm range is critical: the air is polluted with the concentration continue to increase, most people will feel uncomfortable.
- 2000 to 5000ppm: serious air condition and syndrome of headaches, dizzy, stuffy air, poor concentration, increased heart rate and slight nausea.
- Above 5000ppm: this indicates unusual air conditions where high levels of other gases could also be present. Toxicity or oxygen deprivation could occur.
- 40,000 ppm: this level is immediately harmful due to oxygen deprivation.
How to detect CO2 levels?
At room temperature, carbon dioxide (CO2) is a colorless, odorless, non-flammable gas. Detection technologies of sensors are used to monitor CO2 levels at the human presence sites. The most common principles are NDIR non-dispersive infrared and chemical gas sensors. Chemical CO2 gas sensors have the principal advantage of very low energy consumption, but short and long term drift effects, rather low overall lifetime, are major obstacles when compared with the NDIR measurement principle.
NDIR CO2 gas sensors are spectroscopic sensors to detect CO2 by its characteristic absorption. The key elements are a infrared light source, an interference (wavelength) filter, and an infrared detector. The gas is pumped or diffuses into the light tube, absorption of the characteristic wavelength of light is measured.
NDIR sensors are most often used for measuring carbon dioxide due to its high sensitivity and accuracy, stable performance, long life span and affordable cost. However, the light source decline as working time increasing. Winsen has dual channel design that have two rows of elements, will compensate the decline of light source, and realize automatic calibration. To fit different occasions and requirement, Winsen developed CO2 sensors of super low power consumption, improved accuracy, economic cost, optional measurement range for varying demands(to be found in below applications).
HVAC/Air Conditioner/Air Monitor
Indoor air standards for CO2 are not universal for different regions; however, high indoor air levels of carbon dioxide could be an indicator the HVAC system is not working properly. With the growing requirement to install air quality monitoring device including CO2 detector/meter in the buildings and alarm for ventilation, more and more air conditioner manufacturers and HVAC device suppliers add CO2 sensor to their products. Combination use of temperature humidity VOC particle sensors is also a popular trend (related products).
To monitor and control the air quality, innovative CO2 sensors like MH-Z19C/MH-Z19E from Winsen provide precise, cost-effective, and space-saving solutions, widely used in CO2 monitors, air purifier, fresh air system, household air conditioner and HVAC systems. The sensors are compliant with green buildings standards of RESET and WELL.
Smart Agriculture & Livestock Husbandry
In modern agriculture and animals husbandry, real-time monitoring and automatic adjustment of carbon dioxide concentration has become an essential technology. Carbon dioxide sensors used in high-temperature and high-humidity environments such as agricultural greenhouses need to have the ability to resist high-humidity interference, and dual-channel sensor products are generally selected.
WINSEN supplies high quality sensors for world famous education instrument manufacturers. Whether you are holding a micro-pipette for the first time or defining the cutting edge of research, doing science requires high quality innovative solutions. From classrooms to the International Space Station, WINSEN is dedicated to the mission of making science accessible to everyone, everywhere.
Since the Industrial Revolution, human sources of carbon dioxide emissions have been growing. Human sources come from activities like cement production, deforestation as well as the burning of fossil fuels like coal, oil and natural gas. In the context of carbon neutrality, emission of greenhouse gases such as carbon dioxide requires monitoring through sensors and related device.
Automotive Air Conditioner
Vehicles have become the "third space" in life except home and office, people are paying more attention to the concentration of carbon dioxide and organic gases in cars. Carbon dioxide has not only become an important indicator to measure the air quality in the car, but also an important means to prevent fatigue driving. The use of carbon dioxide sensors in automotive air conditioning is becoming a necessary trend.
Help you compare our sensors
Table Overview for Winsen CO2 sensor
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|Winsen CO2 sensor series|
|Working voltage||DC(5.0±0.1)V||DC(5.0±0.1)V||4.5～5.5V DC||4.5～5.5 V DC||3.6～5VDC①|
|Average current||< 40 mA ③||<60mA ③||<85mA③||150uA③||<30mA③||＜100 mA||＜100 mA||＜85mA|
|Peak current||125mA③||150mA ③||150mA③||90mA③||125mA③||/||/||/|
|Interface level||3.3 V④||3.3V④||3.3V④||3.3 V④||3.3 V④||3.3 V||3.3 V||3.0V|
|Detection Range||400~10000ppm⑤||0~10000ppm⑥||0~50000ppm⑦||0~10000ppm⑤||400~10000ppm⑤||0～5% Vol⑤||0～5% Vol⑤||0～10%Vol⑤|
|Output signal||Serial Port (UART) (TTL level 3.3V)||IIC/UART||UART||UART|
|PWM||0.4～2 V||0.4～2 V||0.4～2V②|
|Preheat time||1min||1min||1min||10S||10S||10S||10s||1min||3 min||＜2min||3min|
|Response Time||T90<120s||T90<120s||T90<120s||T90 < 60s||T90<90s||T90<30s||T90 < 60 s||T90<120s||T90＜30 s||T90＜30 s||T90＜30s|
|Working temp.||-10℃～50℃||-10℃～50℃||0℃～50℃||-30℃～85℃||-10℃～50℃||-10℃～50℃||-10～50 ℃||-10～50 ℃||-40～70 ℃||-40～70 ℃||-20～60 ℃|
|Working humidity||0～95%RH(no condensation)|
|Dimension (mm)||58*35*15||33*20*9||33*20*9||33*22*12||58*35*15||97*20*17||33*20*12||Φ44 ×61||Φ39×44||Φ20×22.6|
|Weight||14g||5g||5g||7 g||<15g||<21g||5 g||5 g||350 g||280 g||35g|
|Application||Smart home; Air quality monitoring equipment; Fresh air system; Air purifier; IAQ||Vehicle||Agricultural greenhouse||School; Laboratory||
|Remark||① Power supply from safety grids|
|② Need to pass the safety grid output|
|③ @5V supply|
|④ 5V compatible|
|⑥ max 50000ppm can be extended|
|⑦ max 150000ppm can be extended|