The principle of operation of an oxygen sensor
The operating principle of an oxygen probe is the comparison of two partial pressures of oxygen in two separate gaseous media. The zirconium oxide (ZrO2) in the measuring cell has lattice defects – in other words, some of the sites that could be occupied by oxygen ions are missing. In order to compare these partial pressures, the oxygen probe must be supplied with a gas whose oxygen content is known (ambient air: %O2 = 20.9%), this is the so-called baseline air.
The property of this ceramic allows the displacement of these oxygen ions at a temperature above 600 °C. The measuring element then becomes conductive. The voltage thus generated expresses a ratio between the relative difference in oxygen concentrations and the temperature of the process atmosphere.
Once the voltage value (which varies between 0 and 1200 mV) has been measured, the oxygen concentration can be easily calculated using the Nernst equation to obtain %O2 or by knowing the CO content (either by analysis or by theoretical calculation). The carbon potential (%C) of the heat treatment atmosphere can then be determined.
Econox uses 3 different types of ZrO2 cells for its product line
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Dimension
Ø 14mm
8 x 6mm
8 x 6mm
Thermal shock resistance
Extreme
Low
Normal
Max Length (mm)
–
1000 mm
1400 mm
Our Oxygen probes
are certified
High precision
Our oxygen probes ensure reliable and reproducible measurements, even under extreme conditions. Each product is designed to offer certified accuracy, essential for industrial processes.
Customized service
Econox develops solutions tailored to your specific needs. Our experts will assist you in defining the most relevant probe and technical options for your application.
Swiss made
All our products are designed and manufactured in Switzerland, adhering to the strictest standards. Each thermal measurement probe undergoes rigorous quality controls, guaranteeing performance and longevity.
Reliable
With 40 years of experience, Econox has established itself as a global leader. Our oxygen probes are renowned for their robustness and precision, guaranteeing flawless operation over time.