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

@jon His initial feel of the problem is that there's likely a spectroscopic solution involving different absorption peaks than the NDIR sensors usually focus on. One of his old colleagues is a real spectroscopy boffin so we're hoping he has some bright ideas for a low cost approach.