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工(gong)作原理(li)

鎧(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的(de)(de)(de)工作原理是由兩種不同(tong)成份的(de)(de)(de)導體(ti)兩端(duan)(duan)經(jing)焊接(jie)(jie)(jie)，形成回路(lu)，直(zhi)(zhi)接(jie)(jie)(jie)測溫(wen)(wen)端(duan)(duan)叫測量端(duan)(duan)，接(jie)(jie)(jie)線端(duan)(duan)叫參(can)比端(duan)(duan)。當測量端(duan)(duan)和參(can)比端(duan)(duan)存在溫(wen)(wen)差時，就(jiu)會(hui)在回路(lu)中產(chan)生(sheng)熱(re)電(dian)(dian)(dian)(dian)(dian)流，接(jie)(jie)(jie)上顯示儀表，儀表上就(jiu)會(hui)指示出熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)所產(chan)生(sheng)的(de)(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)動勢(shi)的(de)(de)(de)對應溫(wen)(wen)度值(zhi)。鎧(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的(de)(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)動勢(shi)將隨著測量端(duan)(duan)的(de)(de)(de)溫(wen)(wen)度升高而(er)(er)增長(chang)(chang)，熱(re)電(dian)(dian)(dian)(dian)(dian)動勢(shi)的(de)(de)(de)大小只和鎧(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)導體(ti)材質以及兩端(duan)(duan)溫(wen)(wen)差有(you)關，和熱(re)電(dian)(dian)(dian)(dian)(dian)極的(de)(de)(de)長(chang)(chang)度，直(zhi)(zhi)徑無關。鎧(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的(de)(de)(de)結(jie)構是由導體(ti)，絕緣氧化鎂和1Cr18Ni9Ti不銹鋼保護管經(jing)多次拉制而(er)(er)成，鎧(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)產(chan)品主(zhu)要由接(jie)(jie)(jie)線盒，接(jie)(jie)(jie)線端(duan)(duan)子(zi)和鎧(kai)裝(zhuang)熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)組(zu)成基本結(jie)構，并配(pei)以各種安裝(zhuang)固定裝(zhuang)置組(zu)成。

主要技術指標

測溫(wen)范圍(wei)和(he)準確度

注：1）t為(wei)被(bei)測溫度的******值。

鎧裝(zhuang)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。

鎧裝熱(re)電偶熱(re)響應時間不大于下表的規定：

絕緣(yuan)電阻(zu)

當周圍(wei)空(kong)氣溫度為20±15℃，相對濕度不(bu)大于(yu)80﹪時，絕緣(yuan)型鎧裝熱電(dian)偶(ou)的(de)偶(ou)絲(si)與外(wai)套管之(zhi)間的(de)絕緣(yuan)電(dian)阻(zu)值(zhi)應(ying)符(fu)合(he)下表(biao)規定。

型號表示