Low cost CO2 sensor comparison: photo-acoustic vs NDIR
Achim Haug at airgradient provides an article comparing low cost CO2 sensors.
When it comes to low cost CO2 sensors, there are basically three different methods to measure CO2.
Estimated CO2 (eCO2) through TVOC sensors
NDIR sensors
Photo-acoustic sensors
We strongly advise against using TVOC sensors for CO2 estimation and thus will also not analyse it further in the rest of this article.
The rest of the article goes into detail comparing Photo-Acoustic vs NDIR sensors.
We have been using the SenseAir S8 in our air quality monitors for many years now and have made very good experience with. The Sensirion SCD4x seems to give a similar accuracy under normal indoor conditions but seems to be more impacted by environmental conditions and is not recommended for outdoor usage.
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