Influence of the Case of the Limiting Current Oxygen Sensor on the Steady-state Temperature of the Sensor

The working temperature of the limiting current oxygen sensor is between 400 °C and 500 °C. When the working temperature drifts, the oxygen sensor will result in inaccurate measurement and low efficiency. The reasons that affect the working temperature drift of the oxygen sensor are not only the failure of the heating electrode, but also the heat transfer of the oxygen sensor to the case. Therefore, it is very important to study the influence of the oxygen sensor case on the steady-state temperature of the sensor. In this article, finite element analysis is used to investigate the effect of the case with different materials, heights, and opening diameters on the steady-state temperature of the oxygen sensor. The results show that the difference in case material directly affects the overall heat transfer ability of the oxygen sensor, thereby affecting the working performance of the oxygen sensor. In this process, the most influential indicator is the thermal conductivity of the material; Whether it is changing the height or the diameter of the opening of the outer case, the main impact of the outer case on the steady-state temperature of the oxygen sensor is the heat transfer between solids. Fewer outer case will result in less temperature loss. In summary, by analyzing the effects of different parameters of the oxygen sensor case on its steady-state temperature, this study provides important insights into the design of optimal oxygen sensor cases. The results can be used by researchers to develop new oxygen sensor designs that can perform better in terms of accuracy and efficiency.