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工(gong)作原理

鎧(kai)(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)的(de)(de)工(gong)作(zuo)原理是由(you)兩(liang)(liang)種(zhong)不同成(cheng)份的(de)(de)導體兩(liang)(liang)端(duan)經(jing)焊接，形(xing)成(cheng)回(hui)路，直接測(ce)溫端(duan)叫測(ce)量(liang)(liang)端(duan)，接線端(duan)叫參比(bi)端(duan)。當(dang)測(ce)量(liang)(liang)端(duan)和參比(bi)端(duan)存在溫差(cha)時(shi)，就(jiu)會在回(hui)路中產生(sheng)熱(re)電(dian)(dian)(dian)(dian)(dian)流，接上(shang)顯(xian)示儀表，儀表上(shang)就(jiu)會指示出熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)所產生(sheng)的(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)動勢的(de)(de)對(dui)應(ying)溫度值。鎧(kai)(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)的(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)動勢將隨著測(ce)量(liang)(liang)端(duan)的(de)(de)溫度升高而增長，熱(re)電(dian)(dian)(dian)(dian)(dian)動勢的(de)(de)大小只和鎧(kai)(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)導體材質以及兩(liang)(liang)端(duan)溫差(cha)有關，和熱(re)電(dian)(dian)(dian)(dian)(dian)極(ji)的(de)(de)長度，直徑無關。鎧(kai)(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)的(de)(de)結構是由(you)導體，絕緣氧化鎂和1Cr18Ni9Ti不銹鋼保(bao)護管經(jing)多次拉制(zhi)而成(cheng)，鎧(kai)(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)產品主要由(you)接線盒，接線端(duan)子(zi)和鎧(kai)(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)組(zu)成(cheng)基(ji)本結構，并配以各種(zhong)安(an)裝固定裝置組(zu)成(cheng)。

主要(yao)技術(shu)指標

測溫范(fan)圍(wei)和(he)準確度(du)

注：1）t為被測溫度的******值。

鎧裝熱電(dian)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。

鎧裝熱電偶熱響應時間不(bu)大于下(xia)表的(de)規定：

絕緣電阻

當(dang)周(zhou)圍空(kong)氣溫(wen)度(du)為(wei)20±15℃，相對濕度(du)不大于80﹪時(shi)，絕緣型鎧裝熱電偶(ou)的偶(ou)絲與外套管之間(jian)的絕緣電阻值應符合下表規(gui)定。

型號表示