工(gong)作原理(li)

鎧(kai)裝(zhuang)熱電(dian)(dian)(dian)(dian)偶的(de)(de)工作原理(li)是由(you)兩(liang)種不同成份的(de)(de)導體(ti)兩(liang)端(duan)(duan)(duan)(duan)(duan)經焊接(jie)，形成回路(lu)，直(zhi)接(jie)測溫(wen)端(duan)(duan)(duan)(duan)(duan)叫測量(liang)端(duan)(duan)(duan)(duan)(duan)，接(jie)線端(duan)(duan)(duan)(duan)(duan)叫參比(bi)端(duan)(duan)(duan)(duan)(duan)。當測量(liang)端(duan)(duan)(duan)(duan)(duan)和參比(bi)端(duan)(duan)(duan)(duan)(duan)存(cun)在溫(wen)差(cha)時，就會(hui)在回路(lu)中產(chan)生(sheng)熱電(dian)(dian)(dian)(dian)流，接(jie)上顯示儀表，儀表上就會(hui)指示出(chu)熱電(dian)(dian)(dian)(dian)偶所(suo)產(chan)生(sheng)的(de)(de)熱電(dian)(dian)(dian)(dian)動勢的(de)(de)對應溫(wen)度(du)值。鎧(kai)裝(zhuang)熱電(dian)(dian)(dian)(dian)偶的(de)(de)熱電(dian)(dian)(dian)(dian)動勢將隨著測量(liang)端(duan)(duan)(duan)(duan)(duan)的(de)(de)溫(wen)度(du)升高而(er)(er)增長，熱電(dian)(dian)(dian)(dian)動勢的(de)(de)大小(xiao)只(zhi)和鎧(kai)裝(zhuang)熱電(dian)(dian)(dian)(dian)偶導體(ti)材質以及兩(liang)端(duan)(duan)(duan)(duan)(duan)溫(wen)差(cha)有關，和熱電(dian)(dian)(dian)(dian)極的(de)(de)長度(du)，直(zhi)徑無關。鎧(kai)裝(zhuang)熱電(dian)(dian)(dian)(dian)偶的(de)(de)結構(gou)是由(you)導體(ti)，絕緣氧化鎂和1Cr18Ni9Ti不銹(xiu)鋼保護管(guan)經多(duo)次拉制而(er)(er)成，鎧(kai)裝(zhuang)熱電(dian)(dian)(dian)(dian)偶產(chan)品主要(yao)由(you)接(jie)線盒，接(jie)線端(duan)(duan)(duan)(duan)(duan)子和鎧(kai)裝(zhuang)熱電(dian)(dian)(dian)(dian)偶組(zu)成基本結構(gou)，并配以各種安裝(zhuang)固定裝(zhuang)置組(zu)成。

主要技(ji)術指標

測溫范圍和(he)準確度

注：1）t為被測(ce)溫度的******值(zhi)。

鎧(kai)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。

鎧裝(zhuang)熱電(dian)偶熱響應時間(jian)不(bu)大于下表的規定：

絕緣(yuan)電阻(zu)

當周圍空氣(qi)溫度為20±15℃，相對濕度不大于80﹪時，絕(jue)緣型鎧(kai)裝熱電(dian)偶(ou)的偶(ou)絲與(yu)外(wai)套管之間的絕(jue)緣電(dian)阻值應(ying)符合下表規定。

型(xing)號表示(shi)