3 ms·
How accurate is it in term of linearity of calibration, and how much does it drift over time? As a diver I use oxygen sensors, and those should be calibrated o
by belorn 4y ago
How accurate is it in term of linearity of calibration, and how much does it drift over time?
As a diver I use oxygen sensors, and those should be calibrated once every third day, and linearity can go bad from everything between 6 months to a few years.
If I went with a DIY solution i would definitively go with 3 sensors so one can at least use voting to determine which sensors to trust, and to measure relative drift.
- OisinMoran 4y agoOut of curiosity what voting mechanism would you use? Obviously consensus would be solid for something binary but for a ~continuous value like CO2 level I'm not sure what would make the most sense.
- belorn 4y agoOne method used in one of my diving equipment is to take one sensor and compare the value to the average to the other sensors, and if it's too far out, mark it as potentially broken. Cycle to next one and repeat. This can still situation where either a bad sensor is marked as good, or a good sensor marked as bad, so a human operator is still required to monitor the decisions made.
- iudqnolq 4y agoThw Aranet4 comes with instructions never to recalibrare unless you have a controlled environment as good as their factory setup, fyi.
- fotta 4y agoThe SCD30 I have quotes a drift of +-50 ppm over its lifetime. https://sensirion.com/media/documents/4EAF6AF8/61652C3C/Sensirion_CO2_Sensors_SCD30_Datasheet.pdf https://sensirion.com/media/documents/4EAF6AF8/61652C3C/Sens...