3 ms·
The state of the art for reasonably priced CO2 monitors seems to be that they hard code in the "ambient" Co2 level and instructions tell you to let it sit outs
by Rebelgecko 3y ago
The state of the art for reasonably priced CO2 monitors seems to be that they hard code in the "ambient" Co2 level and instructions tell you to let it sit outside every once in a while. The the sensor adjusts can adjust it's baseline accordingly , assuming that the lowest CO2 level it's seen in the last week or so is equivalent to the "ambient" outside level. Ofc this is susceptible to issues and can require even more adjustments since CO2 levels go up every year. A sensor from 10 years ago might read 5% lower than a modern one because it's using an out of date baseline CO2.
- adhesive_wombat 3y agoNew shareholder value opportunity: Pay an extra 10% and get a dynamic baseline model that hardcodes a baseline level and expected gradient of 0.5% per year. By the time the device lands in landfill, it probably won't ever have been too far off. And if the CO2 curve derivative starts to underperform and risk your deployed calibrations, throw some dollars an some anti-nuclear campaigns as that's cheaper than doing an update!
- EVa5I7bHFq9mnYK 3y agoHere we are talking about 1-2 ppm accuracies. I don't need more than 100ppm accuracy from my CO2 monitor. Hell, just show me one of 4 values: 400, 600, 800 and 1000+ but don't lie.
- electroly 3y agoThe second part of OP's post maybe, but not the first part about needing to place the device outside to set the ambient baseline. They basically can't measure at all without that. My Aranet4 was more like 1000 ppm off before putting it outside for awhile, despite being labeled as calibrated from the factory. It was going absolutely ballistic thinking my apartment was full of smog. After sitting outside to get a taste of ambient air, suddenly the inside of my apartment was fine.
- nicbou 3y agoThat last sentence was a punch in the gut