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工(gong)作(zuo)原理

鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)工(gong)作原理(li)是(shi)由兩種(zhong)不(bu)同成(cheng)(cheng)份(fen)的(de)(de)導(dao)體兩端經焊接，形(xing)成(cheng)(cheng)回路(lu)，直接測溫(wen)端叫(jiao)測量端，接線(xian)(xian)端叫(jiao)參比端。當測量端和(he)參比端存在溫(wen)差(cha)時，就(jiu)會(hui)在回路(lu)中產(chan)(chan)生(sheng)熱(re)(re)電(dian)(dian)(dian)(dian)流，接上顯(xian)示儀(yi)表(biao)，儀(yi)表(biao)上就(jiu)會(hui)指示出熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)所產(chan)(chan)生(sheng)的(de)(de)熱(re)(re)電(dian)(dian)(dian)(dian)動勢的(de)(de)對應溫(wen)度(du)值(zhi)。鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)熱(re)(re)電(dian)(dian)(dian)(dian)動勢將隨著測量端的(de)(de)溫(wen)度(du)升高而(er)(er)增長，熱(re)(re)電(dian)(dian)(dian)(dian)動勢的(de)(de)大小只和(he)鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)導(dao)體材質以及兩端溫(wen)差(cha)有關，和(he)熱(re)(re)電(dian)(dian)(dian)(dian)極(ji)的(de)(de)長度(du)，直徑(jing)無關。鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)結(jie)構(gou)是(shi)由導(dao)體，絕緣氧化鎂和(he)1Cr18Ni9Ti不(bu)銹鋼保護管(guan)經多次拉制而(er)(er)成(cheng)(cheng)，鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)產(chan)(chan)品主要(yao)由接線(xian)(xian)盒，接線(xian)(xian)端子和(he)鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)組成(cheng)(cheng)基本結(jie)構(gou)，并配以各(ge)種(zhong)安裝(zhuang)固定裝(zhuang)置組成(cheng)(cheng)。

主要技(ji)術指(zhi)標(biao)

測溫范(fan)圍和準確度

注：1）t為被測溫度的******值(zhi)。

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(zhuang)熱電偶熱響應時間不大于下表的規定：

絕緣電阻

當周圍空氣溫度(du)(du)為20±15℃，相對濕度(du)(du)不大于80﹪時，絕緣(yuan)型鎧裝熱電(dian)偶的(de)(de)偶絲與外套管之間(jian)的(de)(de)絕緣(yuan)電(dian)阻值應符合下表規定。

型號(hao)表示