一、熱電偶介紹

熱(re)(re)電(dian)(dian)(dian)(dian)偶是(shi)利用熱(re)(re)電(dian)(dian)(dian)(dian)效(xiao)應作為測量原理的(de)一(yi)種(zhong)無源傳(chuan)感(gan)器。所(suo)謂的(de)熱(re)(re)電(dian)(dian)(dian)(dian)效(xiao)應即兩(liang)(liang)種(zhong)不(bu)(bu)同(tong)成(cheng)份的(de)導體(ti)（稱為熱(re)(re)電(dian)(dian)(dian)(dian)偶絲材(cai)或熱(re)(re)電(dian)(dian)(dian)(dian)極）兩(liang)(liang)端接(jie)合成(cheng)回路，當兩(liang)(liang)個接(jie)合點的(de)溫度不(bu)(bu)同(tong)時，在(zai)(zai)回路中就(jiu)會產(chan)生電(dian)(dian)(dian)(dian)動勢的(de)現象。所(suo)以(yi)根據組成(cheng)熱(re)(re)電(dian)(dian)(dian)(dian)偶兩(liang)(liang)種(zhong)絲材(cai)的(de)材(cai)質不(bu)(bu)同(tong)可以(yi)得到不(bu)(bu)同(tong)類(lei)型(xing)的(de)熱(re)(re)電(dian)(dian)(dian)(dian)偶，不(bu)(bu)同(tong)型(xing)號之前也存在(zai)(zai)一(yi)定的(de)差異。

二、k型熱電偶與e型熱電偶區別

K型(xing)熱(re)電偶與E型(xing)熱(re)電偶的區別在(zai)于熱(re)電動勢、靈(ling)敏度(du)、穩定性和均勻性、抗氧化性能和價格。

K型(xing)(xing)熱(re)電(dian)偶(ou)適(shi)(shi)用(yong)于(yu)(yu)氧(yang)化(hua)性(xing)惰性(xing)氣氛(fen)，而E型(xing)(xing)熱(re)電(dian)偶(ou)適(shi)(shi)用(yong)于(yu)(yu)氧(yang)化(hua)性(xing)和惰性(xing)氣氛(fen)，但(dan)不(bu)能(neng)在高溫下(xia)使(shi)用(yong)硫、還原性(xing)或還原性(xing)氣氛(fen)中和真(zhen)空中。E型(xing)(xing)熱(re)電(dian)偶(ou)具(ju)有穩(wen)定性(xing)好(hao)、抗氧(yang)化(hua)性(xing)能(neng)好(hao)、價(jia)格便宜等優點，但(dan)熱(re)電(dian)動勢較大(da)，靈敏度最高，適(shi)(shi)用(yong)于(yu)(yu)高濕度氣氛(fen)，但(dan)對于(yu)(yu)高濕度腐(fu)蝕不(bu)甚靈敏。

三、k型熱電偶和t型熱電偶的區別

k型(xing)(xing)熱電偶和t型(xing)(xing)熱電偶的區別(bie)主要在(zai)于測(ce)量范(fan)圍：

k型，可以(yi)測(ce)量-200度(du)(du)(du)到(dao)1000多度(du)(du)(du)的范圍(wei)，缺點是超過居里(li)點的時候會有特(te)征曲線的跳變，大約150度(du)(du)(du)左右。t型是非(fei)磁性材料，沒有居里(li)點，所以(yi)特(te)征曲線更連(lian)貫，效果好一些。溫(wen)度(du)(du)(du)范圍(wei)-200度(du)(du)(du)到(dao)350度(du)(du)(du)。