How Can You Do Oxygen Measurements in ppm?
PreSens oxygen sensors (like other sensors, e. g. electrodes) measure the partial pressure of oxygen. To get ppm you need the saturation cencentration of the system / solvent the sensor is used in. ppm calculated by the Fibox works for aqueous solutions only, according to:
100 % air saturation is 9 mg / 1000 g H2O (298 K) and 1 atm, i. e. 9 ppm
If the solubility of oxygen in the solvent is considerably higher than in water, ppm at saturation in higher.
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