Presens answers Frequently Asked Questions include how to test the stability of a sensor of an organic solvent and how to incorporate an optical DO sensor into a minibioreactor with an 8mm or a 6mm fitting.
Read More
FAQ: PreSens Products
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.
Do you have any other questions? Feel free to contact Anna.
