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挑選多點防爆熱電偶可以根據哪些方法進行

發布時間:2022-12-01      點擊次數:146
  多點防爆熱電偶是利用間隙隔爆原理,設計具有足夠強度的接線盒等部件,將所有會產生火花,電弧和危險溫度的零部件都密封在接線盒腔內,當腔內發生爆炸時,熱電偶能通過接合面間隙熄火和冷卻,使爆炸后的火焰和溫度傳不到腔外,從而進行隔爆。適合生產現場存在易燃易爆化合物,須同時測量多個位置或位置的多處測量。廣泛應用于石油化工精餾塔裝置。
  多點防爆熱電偶挑選的一些方法:
  1.按照精度和范圍進行挑選
  在挑選熱電偶時應當明確使用該元件的精度和范圍,如果溫度在較高特定值以上并且對于精度的要求又非常高,那么建議可以選擇B型熱電偶。如果精度要求沒有這么高但是溫度更高一些時,可以選擇鎢錸熱電偶。
  2.按照氣氛進行挑選
  實用的熱電偶在選擇的時候還需要考慮使用的氣氛,一般來說S、B和K型三種型號的熱電偶比較適用于強的氧化和弱的還原氣氛中;而J和T型的熱電偶則比較適用于弱氧化和一般的還原氣氛。
  3.按照耐久和熱響應進行挑選
  對于熱電偶還需要按照耐久性和熱響應性進行選擇,一般線徑大的熱電偶擁有非常優異的耐久性但是熱響應性不佳;而容量比較大的熱電偶其熱響應也非常的慢;如果測量的溫差非常大的情況下溫度控制住了,那么其控溫效果就不理想,想要熱響應和耐久性都比較好建議可以選擇鎧裝熱電偶。
  4..選擇合適的熱電偶不光光是比對價格,還需要根據不同使用的場景進行詳細的挑選,其中就包括按照精度和范圍進行挑選、按照使用氣氛進行挑選和按照耐久性和熱響應性進行挑選幾種,只有清楚使用環境以及需求才能否按照明確的條件選出真正適用的熱電偶。
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