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怎么區分K型熱電偶的正負極
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正極(KP)的名義化學成分為:Ni:Cr≈90:10,負極(KN)的化學成分為:Ni:Si≈97。

K 型熱電偶線性度好、熱電動勢較大,所以能用于氧化性、惰性氣氛中。但K型熱電偶不能直接在高溫下用于硫、還原性或還原、氧化交替的氣氛中和真空中,也不推 薦用于弱氧化氣氛之中。它的正極為含鉻10%的鎳鉻合金(KP),負極為含硅3%的鎳硅合金(KN)。

鎧裝熱電偶怎么分正負極呢?依據此特性,用磁 鐵可以很方便地鑒別出鎧裝熱電偶的正負極了。

至于其他熱電偶的正負極區分也很簡單,首先是鎳鉻—鎳硅熱電偶,它的二根絲有明顯的顏色區分,有一根是綠色的,一根是灰色的,綠色的就是正極,如果是鎧裝熱電偶絲,就可以用一個小磁性材料,放在負極面上,也就是灰色的那根絲,如果有吸引力這個就是負極。

區分正負極的方法你學會了嗎?

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