工作原(yuan)理

鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶的工作原理是由(you)(you)兩(liang)種(zhong)不同成(cheng)份的導(dao)體兩(liang)端(duan)(duan)(duan)(duan)(duan)經焊接(jie)(jie)，形(xing)成(cheng)回路，直接(jie)(jie)測溫(wen)端(duan)(duan)(duan)(duan)(duan)叫(jiao)測量(liang)端(duan)(duan)(duan)(duan)(duan)，接(jie)(jie)線(xian)端(duan)(duan)(duan)(duan)(duan)叫(jiao)參比端(duan)(duan)(duan)(duan)(duan)。當測量(liang)端(duan)(duan)(duan)(duan)(duan)和參比端(duan)(duan)(duan)(duan)(duan)存在溫(wen)差(cha)時，就(jiu)會在回路中產(chan)生(sheng)熱(re)電(dian)(dian)(dian)(dian)流，接(jie)(jie)上顯(xian)示(shi)儀表(biao)，儀表(biao)上就(jiu)會指示(shi)出(chu)熱(re)電(dian)(dian)(dian)(dian)偶所產(chan)生(sheng)的熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)的對(dui)應(ying)溫(wen)度(du)值(zhi)。鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶的熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)將隨(sui)著測量(liang)端(duan)(duan)(duan)(duan)(duan)的溫(wen)度(du)升高而增長，熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)的大小只(zhi)和鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶導(dao)體材(cai)質以(yi)(yi)及兩(liang)端(duan)(duan)(duan)(duan)(duan)溫(wen)差(cha)有(you)關(guan)，和熱(re)電(dian)(dian)(dian)(dian)極的長度(du)，直徑(jing)無(wu)關(guan)。鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶的結(jie)構是由(you)(you)導(dao)體，絕緣氧化鎂和1Cr18Ni9Ti不銹鋼保(bao)護管經多次(ci)拉制而成(cheng)，鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶產(chan)品主要由(you)(you)接(jie)(jie)線(xian)盒，接(jie)(jie)線(xian)端(duan)(duan)(duan)(duan)(duan)子(zi)和鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶組成(cheng)基本(ben)結(jie)構，并配(pei)以(yi)(yi)各種(zhong)安裝(zhuang)固(gu)定裝(zhuang)置組成(cheng)。

主要(yao)技術指(zhi)標(biao)

測溫范圍和(he)準確度

注：1）t為被(bei)測溫度的******值。

鎧裝熱電偶(ou)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(jian)不大(da)于下(xia)表的(de)規定：

絕緣電阻

當(dang)周圍空(kong)氣溫度(du)為(wei)20±15℃，相(xiang)對濕度(du)不大于80﹪時，絕(jue)緣(yuan)型鎧(kai)裝熱(re)電(dian)(dian)偶的(de)偶絲與外(wai)套管之間的(de)絕(jue)緣(yuan)電(dian)(dian)阻值(zhi)應符合下表(biao)規定。

型號表(biao)示