How do sample pressure changes effect the output of a Micro-fuel Cell based oxygen analyzer?
The Micro-fuel Cell is a partial pressure device. Its reading is proportional to the partial pressure of the oxygen in the sample. So at 100 percent oxygen, you get (100/20.9) times the output voltage in air — assuming the concentration of oxygen in air is this concentration. In highly humid environments, this is not strictly true. To calculate the effect on the reading, first determine the pressure on the sensor from the sample at the time of calibration or the last reading prior to the pressure change. Then the percentage change in the (absolute) sample pressure will be reflected in a similar if not identical percentage change in the oxygen reading. Example: If the nominal pressure at which the sensor is used and calibrated is 75 mbar gauge pressure, than the absolute pressure the sensor sees is 75 + 1013.25 = 1088.25 mbarA (As Absolute Pr. =Gauge Pr. + Atm.Pr.) If the pressure changes to 200 mbar, 200 mbargauge pressure = 200 + 1013.25 =1213.25 mbarA So, the change in output = ((12
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