The XHTW-5 temperature probe is a mechanical device that sends thermocouples into the furnace to monitor the temperature of furnace flue gas. The thermocouple is fixed at the head of the probe gun and performs telescopic motion in the smoke, with a movement speed of about 2.5 meters per minute. The temperature probe is driven by a 1.1KW motor and can be operated remotely, remotely, and monitored by DCS. During boiler start-up, the temperature of the reheater tube bundle located at the furnace outlet may reach or even exceed the material temperature tolerance limit due to the lack of circulating steam for cooling. The temperature probe is used as a smoke temperature monitoring device during boiler startup to continuously measure the temperature of the area, avoiding the risk of reheater burnout. The temperature probe can also be used to measure the flue gas temperature during low load operation of the boiler, as an auxiliary control method.