Explosion proof thermocouple is a type of temperature sensor widely used in chemical industry self-control systems. Through temperature sensors, the temperature parameters of the controlled object can be converted into electrical signals, which are transmitted to display, record, and adjust instruments to detect, adjust, and control the system. In chemical plants, the production site is often accompanied by various flammable and explosive chemical gases and vapors. If ordinary thermocouples are used, it is very unsafe and can easily cause environmental gas explosions.