Not sure what sensor you were using for the plot, but I'd be careful to make sure you're not tracking something else like temperature or humidity with the sensor. Reading through the minimal spec sheet with it, it claims to need 14 days to calibrate the ABC system--I would assume uncalibrated from All Electronics by default. This also assumes that the unit sees 400ppm at least 3 times per day for calibration.
Specified accuracy is after re-zeroing process
or 14 days of continuous operation with ABC Logic.
As far as building the system, I'd try to find out the necessary protocal to interface with it over a SPI bus. You have one per arduino chip (assuming not a mega) but can select which device you want to interface with via a cs pin if you're also wanting to drive say an lcd.
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