been musing on the CO2/glycol issue and I somehow forgot that my uncle is an organic chemist.
one nerdsnipe later and the chemistry department at the university of plymouth is now on the case :D
@oohshiiiny accurately and repeatably detecting CO2 levels in an environment saturated with glycol vapour.
off-the-shelf NDIR sensors do not work in this scenario due to crossover in the absorption spectra. subtractive calibration from a second sensor isn't feasible either because the NDIR CO2 sensors have a nonlinear response to glycol/CO2 mixtures, and I don't have the facilities to perform a calibration across 3 gases.