Are There Double-layer Thermocouple Sleeves?

‌Thermocouple sleeves do have double-layer designs. ‌

The design of double-layer thermocouple sleeves is mainly to solve the measurement error problem caused by radiation and to improve the service life. This design usually includes an inner sleeve and an outer sleeve. The inner sleeve is provided with a thermocouple arranged along its axial direction. A shielding cover is provided between the inner sleeve and the measuring end of the thermocouple, and there is a gap between the shielding cover and the inner sleeve. In addition, the inner sleeve is connected to an exhaust pipe to realize the exhaust function. ‌

The application scenarios of double-layer thermocouple sleeves include temperature measurement in high temperature environments. Its advantages include high temperature measurement and low temperature measurement error. For example, some models of thermocouple sleeves can be used at a high temperature of 1800 degrees and have good oxidation resistance and corrosion resistance. ‌