How is the high temperature resistant ceramic or metal protection tube combined with the thermode?

The key to the 171 series thermocouple sensors being able to maintain stable measurement performance in high temperature environments is that they use advanced material technology and sophisticated process technology. As the "armor" of the thermocouple, the high-temperature resistant ceramic and metal protection tube not only bear the heavy responsibility of protecting the thermocouple from high temperature erosion, but also ensure the long-term stability and reliability of the thermocouple under high temperature conditions through precise bonding.

Perfect combination of ceramics and metals
In the 171 series thermocouples, the high-temperature resistant ceramic protection tube is cleverly used as the outer protective layer of the thermocouple. This ceramic material has an extremely high melting point, excellent thermal stability and good insulation properties, and can maintain structural integrity and electrical performance stability at extremely high temperatures. In order to closely combine the ceramic protection tube with the thermocouple, the R&D team used advanced sintering technology and precise processing technology. The thermocouple materials (such as nickel-chromium-nickel-silicon alloy) are strictly screened and precisely processed to ensure that their dimensional accuracy and surface quality meet the design requirements. Subsequently, the ceramic powder is evenly coated on the surface of the thermocouple, and a strong chemical bond is formed between the ceramic and the thermocouple through a high-temperature sintering process. This process not only ensures the close combination of the ceramic protection tube and the hot electrode, but also greatly improves the high temperature resistance of the entire thermocouple.

Strengthened support of the metal protection tube
In addition to the ceramic protection tube, the 171 series thermocouple is also equipped with a metal protection tube as an additional protective layer. The metal protection tube is usually made of high temperature resistant and corrosion resistant stainless steel material, with excellent mechanical strength and impact resistance. Structurally, the metal protection tube is tightly wrapped around the outside of the ceramic protection tube, forming a solid barrier, which further enhances the durability of the thermocouple in high temperature, high pressure and corrosive environments.

In order to ensure the close combination between the metal protection tube and the ceramic protection tube, the R&D team adopted advanced welding and sealing technology. Through the precise welding process, a reliable connection is formed between the metal protection tube and the ceramic protection tube, which effectively prevents the intrusion of high temperature gas and corrosive media. At the same time, the application of sealing technology also ensures the integrity and stability of the internal circuit of the thermocouple, providing a strong guarantee for accurate temperature measurement.