The structure of a thermocouple is mainly composed of a thermocouple head and a large paper tube.The coupling head is mainly welded with positive and negative coupling wire on the compensation wire, and the compensation wire is embedded in the bracket,at the outside of the bracket has a small paper tube, and the coupling wire is supported and protected by quartz.The most external is equipped with slag cap, all components are concentrated into the mud head and bonded into a whole with refractory filler, but not disassembled, so it is disposable