工作原理

鎧(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的(de)(de)工作原理是由兩(liang)種不(bu)(bu)同成(cheng)份的(de)(de)導體(ti)兩(liang)端(duan)經焊(han)接(jie)(jie)(jie)(jie)，形成(cheng)回(hui)路，直接(jie)(jie)(jie)(jie)測溫(wen)(wen)端(duan)叫(jiao)測量(liang)端(duan)，接(jie)(jie)(jie)(jie)線端(duan)叫(jiao)參(can)比端(duan)。當(dang)測量(liang)端(duan)和(he)(he)參(can)比端(duan)存(cun)在(zai)溫(wen)(wen)差(cha)時(shi)，就(jiu)會(hui)在(zai)回(hui)路中(zhong)產生熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，接(jie)(jie)(jie)(jie)上顯示(shi)儀表，儀表上就(jiu)會(hui)指示(shi)出(chu)熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)所(suo)產生的(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動勢(shi)的(de)(de)對(dui)應溫(wen)(wen)度值。鎧(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動勢(shi)將隨著測量(liang)端(duan)的(de)(de)溫(wen)(wen)度升高而(er)增(zeng)長(chang)，熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)動勢(shi)的(de)(de)大小只和(he)(he)鎧(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)導體(ti)材質以及兩(liang)端(duan)溫(wen)(wen)差(cha)有(you)關(guan)，和(he)(he)熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)極的(de)(de)長(chang)度，直徑無關(guan)。鎧(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的(de)(de)結構是由導體(ti)，絕緣氧化(hua)鎂和(he)(he)1Cr18Ni9Ti不(bu)(bu)銹鋼保護管經多次拉制而(er)成(cheng)，鎧(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)產品主要由接(jie)(jie)(jie)(jie)線盒，接(jie)(jie)(jie)(jie)線端(duan)子和(he)(he)鎧(kai)裝熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)組(zu)(zu)成(cheng)基本結構，并(bing)配以各種安裝固定裝置組(zu)(zu)成(cheng)。

主要技(ji)術指標

測溫范圍和(he)準(zhun)確度

注：1）t為被測溫度的******值。

鎧裝熱電偶熱響應時間

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(kai)裝熱電(dian)偶熱響應時間不大(da)于下表的規定：

絕(jue)緣電(dian)阻(zu)

當周(zhou)圍(wei)空氣溫(wen)度(du)為20±15℃，相對濕度(du)不大于80﹪時，絕緣(yuan)(yuan)型鎧裝熱電(dian)偶的偶絲與外(wai)套管之間的絕緣(yuan)(yuan)電(dian)阻值應符合下表規(gui)定。

型號表(biao)示