工作原理(li)

鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的工作原理(li)是由(you)(you)兩(liang)種不同成(cheng)份的導(dao)體兩(liang)端(duan)(duan)(duan)(duan)(duan)(duan)經焊接，形成(cheng)回路(lu)，直(zhi)接測(ce)溫(wen)(wen)(wen)端(duan)(duan)(duan)(duan)(duan)(duan)叫測(ce)量(liang)(liang)端(duan)(duan)(duan)(duan)(duan)(duan)，接線(xian)端(duan)(duan)(duan)(duan)(duan)(duan)叫參比(bi)端(duan)(duan)(duan)(duan)(duan)(duan)。當測(ce)量(liang)(liang)端(duan)(duan)(duan)(duan)(duan)(duan)和參比(bi)端(duan)(duan)(duan)(duan)(duan)(duan)存在(zai)溫(wen)(wen)(wen)差時，就會(hui)在(zai)回路(lu)中(zhong)產(chan)生熱(re)(re)電(dian)(dian)(dian)(dian)流，接上顯(xian)示儀表(biao)，儀表(biao)上就會(hui)指示出(chu)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)所(suo)產(chan)生的熱(re)(re)電(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)的對應溫(wen)(wen)(wen)度值(zhi)。鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的熱(re)(re)電(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)將(jiang)隨著測(ce)量(liang)(liang)端(duan)(duan)(duan)(duan)(duan)(duan)的溫(wen)(wen)(wen)度升高(gao)而增長(chang)(chang)，熱(re)(re)電(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)的大小(xiao)只和鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)導(dao)體材質(zhi)以及兩(liang)端(duan)(duan)(duan)(duan)(duan)(duan)溫(wen)(wen)(wen)差有關，和熱(re)(re)電(dian)(dian)(dian)(dian)極的長(chang)(chang)度，直(zhi)徑無關。鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的結(jie)構(gou)是由(you)(you)導(dao)體，絕緣(yuan)氧化鎂和1Cr18Ni9Ti不銹鋼保護管經多次(ci)拉制而成(cheng)，鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)產(chan)品主要由(you)(you)接線(xian)盒，接線(xian)端(duan)(duan)(duan)(duan)(duan)(duan)子和鎧(kai)(kai)裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)組成(cheng)基(ji)本(ben)結(jie)構(gou)，并配(pei)以各(ge)種安裝(zhuang)固定裝(zhuang)置(zhi)組成(cheng)。

主(zhu)要技術指標

測溫(wen)范(fan)圍和(he)準確(que)度

注：1）t為被測溫度的******值。

鎧裝(zhuang)熱(re)電偶熱(re)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(kai)裝熱(re)電偶(ou)熱(re)響應(ying)時間不大于下表的規定：

絕緣電阻

當周圍空氣溫度(du)為20±15℃，相對(dui)濕度(du)不大于80﹪時(shi)，絕緣型鎧裝熱電(dian)偶(ou)的偶(ou)絲與外(wai)套(tao)管之(zhi)間(jian)的絕緣電(dian)阻(zu)值(zhi)應(ying)符合下(xia)表規定。

型號表(biao)示(shi)