We usually use the SenseAir S8 NDIR sensors that have a very good quality but also have a couple of MH-Z19 sensors in monitors that run since a couple of years without issues.
We ran a comparison between the two and the S8 and MH-Z19 pretty much delivers the same values (with ABS turned on).
We use the automatic baseline calibration in pretty much all our installations so we do not have experience on long term drifts.
We ran a comparison between the two and the S8 and MH-Z19 pretty much delivers the same values (with ABS turned on).
We use the automatic baseline calibration in pretty much all our installations so we do not have experience on long term drifts.