The high-temperature sealed installation structure securely fastens the probe to the furnace wall, ensuring gas tightness at high temperatures.

Thermocouples (usually integrated with probes): Used for accurately measuring the temperature of the probe itself (i.e., the working temperature of zirconia). Temperature measurement is crucial for calculating the output signal.

The protective tube primarily safeguards the zirconium tube from internal furnace air erosion, mechanical damage, and soot pollution. It is commonly made of porous ceramics or alloy materials, allowing the ambient gases to slowly diffuse into the measuring chamber.