工(gong)作原(yuan)理

鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)偶的(de)(de)工(gong)作原理是(shi)由(you)兩種(zhong)不(bu)同成(cheng)(cheng)份(fen)的(de)(de)導(dao)體(ti)(ti)兩端(duan)經(jing)焊接，形成(cheng)(cheng)回路(lu)，直(zhi)接測(ce)溫(wen)(wen)端(duan)叫測(ce)量(liang)端(duan)，接線(xian)(xian)端(duan)叫參(can)比端(duan)。當測(ce)量(liang)端(duan)和(he)參(can)比端(duan)存在(zai)溫(wen)(wen)差時，就會在(zai)回路(lu)中產(chan)生(sheng)(sheng)熱(re)(re)(re)(re)電(dian)(dian)(dian)流，接上顯示(shi)儀(yi)表，儀(yi)表上就會指示(shi)出熱(re)(re)(re)(re)電(dian)(dian)(dian)偶所(suo)產(chan)生(sheng)(sheng)的(de)(de)熱(re)(re)(re)(re)電(dian)(dian)(dian)動勢的(de)(de)對應溫(wen)(wen)度值。鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)偶的(de)(de)熱(re)(re)(re)(re)電(dian)(dian)(dian)動勢將隨著測(ce)量(liang)端(duan)的(de)(de)溫(wen)(wen)度升(sheng)高(gao)而增長，熱(re)(re)(re)(re)電(dian)(dian)(dian)動勢的(de)(de)大小只和(he)鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)偶導(dao)體(ti)(ti)材質以及兩端(duan)溫(wen)(wen)差有關，和(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)極的(de)(de)長度，直(zhi)徑無關。鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)偶的(de)(de)結構是(shi)由(you)導(dao)體(ti)(ti)，絕緣氧化鎂和(he)1Cr18Ni9Ti不(bu)銹鋼保護管經(jing)多次拉制而成(cheng)(cheng)，鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)偶產(chan)品主要由(you)接線(xian)(xian)盒，接線(xian)(xian)端(duan)子(zi)和(he)鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)偶組成(cheng)(cheng)基本結構，并配以各(ge)種(zhong)安(an)裝(zhuang)(zhuang)(zhuang)固定裝(zhuang)(zhuang)(zhuang)置組成(cheng)(cheng)。

主要技術指標

測溫范圍和(he)準確度

注：1）t為被測溫度的(de)******值。

鎧裝熱電(dian)偶熱響(xiang)應(ying)時間(jian)

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)熱電偶熱響應時間不大于(yu)下表的規(gui)定(ding)：

絕緣電阻

當(dang)周圍空(kong)氣(qi)溫度為(wei)20±15℃，相(xiang)對濕度不大于80﹪時(shi)，絕緣(yuan)型鎧裝熱(re)電偶的偶絲與外套(tao)管之間的絕緣(yuan)電阻值應符合下表規定。

型(xing)號表(biao)示