工(gong)作原理(li)

鎧(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶的工作原(yuan)理是由(you)兩種(zhong)不(bu)同(tong)成(cheng)份的導(dao)體(ti)(ti)兩端(duan)(duan)(duan)(duan)經焊接(jie)，形成(cheng)回路(lu)，直接(jie)測溫端(duan)(duan)(duan)(duan)叫測量端(duan)(duan)(duan)(duan)，接(jie)線(xian)端(duan)(duan)(duan)(duan)叫參比(bi)端(duan)(duan)(duan)(duan)。當(dang)測量端(duan)(duan)(duan)(duan)和參比(bi)端(duan)(duan)(duan)(duan)存在(zai)溫差時(shi)，就會在(zai)回路(lu)中產(chan)生熱(re)電(dian)(dian)(dian)(dian)流，接(jie)上(shang)顯示(shi)儀表，儀表上(shang)就會指(zhi)示(shi)出熱(re)電(dian)(dian)(dian)(dian)偶所(suo)產(chan)生的熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)的對應溫度值。鎧(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶的熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)將隨著測量端(duan)(duan)(duan)(duan)的溫度升(sheng)高而增長，熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)的大(da)小(xiao)只和鎧(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶導(dao)體(ti)(ti)材質(zhi)以(yi)及兩端(duan)(duan)(duan)(duan)溫差有關，和熱(re)電(dian)(dian)(dian)(dian)極的長度，直徑無關。鎧(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶的結(jie)構是由(you)導(dao)體(ti)(ti)，絕緣氧化鎂(mei)和1Cr18Ni9Ti不(bu)銹鋼保(bao)護管經多次拉制而成(cheng)，鎧(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶產(chan)品主要由(you)接(jie)線(xian)盒，接(jie)線(xian)端(duan)(duan)(duan)(duan)子和鎧(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)熱(re)電(dian)(dian)(dian)(dian)偶組成(cheng)基本結(jie)構，并配(pei)以(yi)各種(zhong)安裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)固定裝(zhuang)(zhuang)(zhuang)(zhuang)(zhuang)置組成(cheng)。

主要技術(shu)指(zhi)標

測溫范圍和(he)準確度(du)

注：1）t為被測溫(wen)度的******值。

鎧裝熱電偶(ou)熱響應時(shi)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(kai)裝熱(re)電偶熱(re)響(xiang)應時間(jian)不大于下表的規定：

絕緣電阻

當周(zhou)圍空氣溫度為20±15℃，相對(dui)濕度不大于80﹪時(shi)，絕緣型鎧(kai)裝熱電偶(ou)的(de)偶(ou)絲與(yu)外套管(guan)之間的(de)絕緣電阻值應符合下表(biao)規定。

型(xing)號表示