Oxygen sensor series FCX covers four different measuring ranges
2016-03-14 08:28:52, Angst+Pfister Sensors and Power AG The FCX oxygen sensor series covers four different measuring ranges: 0-1000 ppm, 0-5%, 0-25% and 0-95%. The individual zirconium-based sensors meet the highest requirements in terms of accuracy, signal stability/reproducibility, response time and service life in their respective measuring ranges. The output signal is in the µA range and is logarithmic with increasing oxygen content.
When heated to > 350°C, zirconia (with the right doping elements) is permeable to oxygen ions. The operating point of the FCX oxygen sensor series is 450°C. The heating element and the oxygen sensor are connected, ensuring perfect temperature transfer and minimal power consumption at the operating point. Oxygen is pumped out of a closed inner chamber by a voltage applied to the oxygen sensor. At constant gas pressure, the amount of oxygen pumped out is equal to the amount of oxygen molecules flowing in through a small capillary opening. This is independent of the voltage applied between the electrodes in a given area. The measured current is proportional to the amount of oxygen molecules pumped away. The relationship between the oxygen partial pressure pO2 and the sensor current Is is expressed by the formal Is = constant x In (1 - pO2 / pt), where pt represents the total partial pressure in the system.
When heated to > 350°C, zirconia (with the right doping elements) is permeable to oxygen ions. The operating point of the FCX oxygen sensor series is 450°C. The heating element and the oxygen sensor are connected, ensuring perfect temperature transfer and minimal power consumption at the operating point. Oxygen is pumped out of a closed inner chamber by a voltage applied to the oxygen sensor. At constant gas pressure, the amount of oxygen pumped out is equal to the amount of oxygen molecules flowing in through a small capillary opening. This is independent of the voltage applied between the electrodes in a given area. The measured current is proportional to the amount of oxygen molecules pumped away. The relationship between the oxygen partial pressure pO2 and the sensor current Is is expressed by the formal Is = constant x In (1 - pO2 / pt), where pt represents the total partial pressure in the system.
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