01-10-2017, 01:58
(30-09-2017, 22:27)JT118 Wrote: I think these sensors are really designed for HVAC ...
That seems right and coincides with what the manufacturer says:
"MH-Z19 NDIR infrared gas module is widely used in the HVAC refrigeration and indoor air quality monitoring."
Despite there is no reference to the ABC function on the MH-Z19 datasheet, as happens in the MH-Z19B datasheet, its possible that the MH-Z19 also have the ABC function, we just don't know if it is enabled or disabled by default.
In any case, at least for the B version there is a command to disable the ABC function. I have no idea if that command works with the non "B" version.
This site have some interesting info about the MH-Z19:
https://revspace.nl/MHZ19