工作原理

鎧(kai)裝(zhuang)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶的(de)(de)工作原理是由兩種(zhong)(zhong)不同成(cheng)份(fen)的(de)(de)導體兩端(duan)經焊接，形成(cheng)回(hui)路，直(zhi)(zhi)接測溫(wen)端(duan)叫測量端(duan)，接線(xian)端(duan)叫參比(bi)端(duan)。當測量端(duan)和參比(bi)端(duan)存在溫(wen)差時，就(jiu)(jiu)會(hui)(hui)在回(hui)路中產(chan)生熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)流，接上(shang)顯示(shi)儀表，儀表上(shang)就(jiu)(jiu)會(hui)(hui)指示(shi)出熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶所(suo)產(chan)生的(de)(de)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)動(dong)(dong)勢的(de)(de)對應溫(wen)度(du)值。鎧(kai)裝(zhuang)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶的(de)(de)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)動(dong)(dong)勢將隨(sui)著測量端(duan)的(de)(de)溫(wen)度(du)升高而增長(chang)，熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)動(dong)(dong)勢的(de)(de)大小只(zhi)和鎧(kai)裝(zhuang)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶導體材質以及(ji)兩端(duan)溫(wen)差有關，和熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)極的(de)(de)長(chang)度(du)，直(zhi)(zhi)徑無(wu)關。鎧(kai)裝(zhuang)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶的(de)(de)結(jie)構(gou)是由導體，絕緣氧(yang)化鎂和1Cr18Ni9Ti不銹鋼保護管經多次(ci)拉(la)制而成(cheng)，鎧(kai)裝(zhuang)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶產(chan)品(pin)主要由接線(xian)盒，接線(xian)端(duan)子和鎧(kai)裝(zhuang)熱(re)(re)(re)(re)(re)電(dian)(dian)(dian)偶組(zu)成(cheng)基本結(jie)構(gou)，并配以各種(zhong)(zhong)安裝(zhuang)固定裝(zhuang)置(zhi)組(zu)成(cheng)。

主要技術指標

測溫范圍和準確度

注：1）t為被測溫度(du)的******值。

鎧裝熱電偶熱響應時間

在溫度出現階躍變化時，熱電偶的輸出變化至相當于該階躍變化的50%，所需要的時間稱為熱響應時間，用T_0.5表示。

鎧(kai)裝(zhuang)熱(re)電偶熱(re)響(xiang)應(ying)時(shi)間不大于下表(biao)的規定：

絕緣電阻(zu)

當周圍空氣溫度(du)為20±15℃，相(xiang)對濕度(du)不大于80﹪時(shi)，絕(jue)緣型鎧裝熱電(dian)偶的偶絲與(yu)外套(tao)管之(zhi)間的絕(jue)緣電(dian)阻(zu)值應符合下表規定。

型(xing)號表示