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工作原理

鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)的工作原理是(shi)由(you)兩種不(bu)同成(cheng)(cheng)份的導體(ti)兩端(duan)(duan)(duan)(duan)經焊接(jie)，形成(cheng)(cheng)回路，直(zhi)(zhi)接(jie)測(ce)溫端(duan)(duan)(duan)(duan)叫(jiao)測(ce)量(liang)端(duan)(duan)(duan)(duan)，接(jie)線端(duan)(duan)(duan)(duan)叫(jiao)參比端(duan)(duan)(duan)(duan)。當測(ce)量(liang)端(duan)(duan)(duan)(duan)和(he)(he)參比端(duan)(duan)(duan)(duan)存在溫差時，就(jiu)會(hui)在回路中產(chan)生熱(re)電(dian)(dian)(dian)(dian)(dian)流，接(jie)上顯示儀(yi)表，儀(yi)表上就(jiu)會(hui)指示出熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)所產(chan)生的熱(re)電(dian)(dian)(dian)(dian)(dian)動勢(shi)(shi)的對(dui)應溫度(du)值。鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)的熱(re)電(dian)(dian)(dian)(dian)(dian)動勢(shi)(shi)將隨著(zhu)測(ce)量(liang)端(duan)(duan)(duan)(duan)的溫度(du)升高而增長，熱(re)電(dian)(dian)(dian)(dian)(dian)動勢(shi)(shi)的大小只和(he)(he)鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)導體(ti)材質以及(ji)兩端(duan)(duan)(duan)(duan)溫差有(you)關，和(he)(he)熱(re)電(dian)(dian)(dian)(dian)(dian)極的長度(du)，直(zhi)(zhi)徑無關。鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)的結構是(shi)由(you)導體(ti)，絕緣氧化鎂和(he)(he)1Cr18Ni9Ti不(bu)銹鋼(gang)保(bao)護管經多(duo)次拉(la)制(zhi)而成(cheng)(cheng)，鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)產(chan)品主要由(you)接(jie)線盒，接(jie)線端(duan)(duan)(duan)(duan)子(zi)和(he)(he)鎧(kai)(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)組成(cheng)(cheng)基本結構，并配以各(ge)種安裝(zhuang)固定裝(zhuang)置組成(cheng)(cheng)。

主要技術指標

測溫范圍和準(zhun)確(que)度(du)

注(zhu)：1）t為被測溫度的******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(ou)熱響(xiang)應(ying)時間不大于下表的規定(ding)：

絕緣電阻

當周圍空氣溫度(du)(du)為20±15℃，相(xiang)對(dui)濕度(du)(du)不(bu)大于(yu)80﹪時，絕(jue)緣型鎧裝熱電(dian)偶(ou)的偶(ou)絲與外套管之間的絕(jue)緣電(dian)阻值應(ying)符合下表規定。

型(xing)號(hao)表示