You have to calibrate the ‘sensor’ for your environment. We will try to use this CO sensor in a dry-argon gas environment. We will calibrate the sensor with known amounts of CO. There are gas tight syringes that can do this. It also means that you need access to pure CO and proper safety equipment (such as a common CO detector and fume hood). If we change the environment we will have to recalibrate. There is no way around this step. It should be possible to generate a two point plot for different environments that would correlate the Rs/Ro to PPM.
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