A fast miniature thermocouple, a thermocouple used to measure the temperature of molten steel, molten iron or other molten metal, as shown in Figure 1-5. 
The metal protective cap protects the U-shaped quartz tube from being scratched. A pair of hot electrodes (usually platinum-platinum-platinum or double-platinum-iridium) with a diameter of 0.05-0.1 mm and a length of 25-40 mm are inserted into the U-shaped quartz tube, and the thermoelectric potential is connected to the contact point on the plastic insert through the corresponding compensation wire. Therefore, the wire inside the temperature measuring gun is connected to a fast electronic potentiometer (recording instrument) or a digital display meter.
During temperature measurement, the operator inserts the thermocouple into the molten steel through the temperature measuring gun, the metal protection is rapidly melted, and the U-shaped quartz tube and the hot electrode are exposed to the melt and are instantaneously burned. However, the thermoelectric potential signal generated by the molten steel temperature has been sent to the fast electronic potentiometer to indicate and record the molten steel temperature.
Because a thermocouple is used only once, it is also called a consumable thermocouple. Since most of these thermocouples are inexpensive, even precious metal thermocouples, platinum-plated platinum is extremely thin, and the site is not large. In general, the price is still cheap, which is why steel mills are widely used.
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