Regarding thermocouples with heat sleeves

In my words, it’s just a thermocouple with a protective sleeve on the outside that can be removed. To protect the thermocouple element and to facilitate installation and use. 　 Below is a passage excerpted from the Internet; I think it’s more professional than what I could say. Thermowell thermocouples are primarily used to measure the temperature of steam pipes and boilers. The thermocouple features a heat-shielded protective tube that allows for quick separation from the thermocouple element. During use, the user can weld or screw the heat shield to the main equipment, and then screw the thermocouple in place to start using it. Its advantage is that it increases the operating pressure and service life of the protective tube, and it also facilitates the maintenance or replacement of the thermocouple; currently, this design format is widely used. ----The heat-shrinkable protective tube is manufactured using a special deep blind-hole processing technique; its wall thickness is uniform at the ends, and welding is not required. As a result, there is no issue of grain growth in the material caused by welding stresses, which gives the heat-shrinkable tube high mechanical strength and corrosion resistance. ----All of our products use armored temperature sensing elements; therefore, while other manufacturers in China produce products with assembled-element structures, our company uses armored-element structures. ----Thermowell-type thermocouples come in several different structures and installation styles, depending on the operating pressure, temperature, and flow rate involved; users can choose the appropriate one based on their specific application requirements. At the same time, once a transmitter is installed on this product, it not only saves on compensation wires but also outputs a standard 4–20mA signal from the temperature transmitter, thereby enhancing its resistance to interference.