I have a number of NDIR carbon dioxide (co2) sensors for general indoor air quality (IAQ) monitoring, and I notice that when the house is vacant, well ventilated, and there are no artificial sources of co2 production, the co2 level fluctuates between day and night.
I have some sensors that fluctuate 50 PPM, and some that go up to 100 PPM. This kind of suggests that different sensors have different compensation methods, and some work better than others. But looking at temperature and humidity, there is only mild, and significantly lagging correlation between co2 and temperature/humidity.
I tried to Google a little bit, if there are natural and measurable co2 fluctuations between day and night (flora don't consume co2 at night and it spikes?) but didn't find anything.
I have some sensors that fluctuate 50 PPM, and some that go up to 100 PPM. This kind of suggests that different sensors have different compensation methods, and some work better than others. But looking at temperature and humidity, there is only mild, and significantly lagging correlation between co2 and temperature/humidity.
I tried to Google a little bit, if there are natural and measurable co2 fluctuations between day and night (flora don't consume co2 at night and it spikes?) but didn't find anything.