Sometimes some people will ask, what is a platinum-rhodium S-type thermocouple, what is its purpose and function? Now the editor collects information to solve this problem for everyone. The platinum-rhodium S-type thermocouple is an iron-copper-nickel thermocouple, also known as an iron-constantan thermocouple, which is also an expensive and inexpensive metal thermocouple. The nominal chemical composition of its positive electrode is pure iron, and the negative electrode is a copper-nickel alloy, often vaguely called constantan. Its nominal chemical composition is: 55% copper, 45% nickel, and a large amount of very important manganese. Cobalt, iron and other elements, although it is called constantan, it is different from the constantan of nickel-chromium-constantan and copper-constantan, so EN and TN cannot be exchanged. The cover measurement temperature range of iron-constantan thermocouple is -200~1200℃, but the temperature range usually used is 0~750℃. Platinum-rhodium S-type thermocouple has the advantages of large thermoelectromotive force, good linearity, high sensitivity, good stability and averageness, and low price. It is widely used by players. Platinum-rhodium S-type thermocouples can be used in vacuum, oxidation, recovery and inert atmospheres, but the anode iron oxidizes faster at low temperatures, so the operating temperature is restricted, and it cannot be used in vulcanization atmospheres at low temperatures indirectly without maintenance.
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