Nano-Zirconia Sensing Technology: Utilizing a combination of high purity zirconia electrolyte and platinum electrodes, it achieves a measurement accuracy of ±0.02% carbon potential within the working range of 650-1150°C, ensuring carbon potential control error in carburization/carbonitriding process is less than ±0.05%C. Triple Composite Protection Structure: The outer layer is a 304H heat-resistant steel protective tube capable of withstanding instantaneous high-temperature shocks up to 1300°C; the middle layer is an alumina ceramic fiber layer that prevents furnace gas corrosion; the inner layer features a reference gas self-purification device that filters particles larger than 20μm.