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工作(zuo)原理

鎧裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)工作原理是(shi)由兩種(zhong)不同成份的(de)(de)導體(ti)(ti)兩端(duan)(duan)(duan)(duan)經(jing)焊接(jie)，形成回(hui)路，直接(jie)測溫(wen)端(duan)(duan)(duan)(duan)叫測量(liang)端(duan)(duan)(duan)(duan)，接(jie)線端(duan)(duan)(duan)(duan)叫參比端(duan)(duan)(duan)(duan)。當(dang)測量(liang)端(duan)(duan)(duan)(duan)和參比端(duan)(duan)(duan)(duan)存(cun)在(zai)(zai)溫(wen)差時，就(jiu)會在(zai)(zai)回(hui)路中產生(sheng)(sheng)熱(re)(re)電(dian)(dian)(dian)(dian)流，接(jie)上顯示儀(yi)表(biao)，儀(yi)表(biao)上就(jiu)會指示出熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)所產生(sheng)(sheng)的(de)(de)熱(re)(re)電(dian)(dian)(dian)(dian)動勢(shi)的(de)(de)對應溫(wen)度(du)值。鎧裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)熱(re)(re)電(dian)(dian)(dian)(dian)動勢(shi)將隨著測量(liang)端(duan)(duan)(duan)(duan)的(de)(de)溫(wen)度(du)升高(gao)而(er)增(zeng)長(chang)，熱(re)(re)電(dian)(dian)(dian)(dian)動勢(shi)的(de)(de)大小(xiao)只和鎧裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)導體(ti)(ti)材(cai)質以(yi)及兩端(duan)(duan)(duan)(duan)溫(wen)差有關，和熱(re)(re)電(dian)(dian)(dian)(dian)極的(de)(de)長(chang)度(du)，直徑(jing)無(wu)關。鎧裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)結構是(shi)由導體(ti)(ti)，絕緣氧化(hua)鎂(mei)和1Cr18Ni9Ti不銹鋼保(bao)護管經(jing)多次拉(la)制而(er)成，鎧裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)產品主要由接(jie)線盒，接(jie)線端(duan)(duan)(duan)(duan)子和鎧裝(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)組(zu)成基本結構，并配以(yi)各種(zhong)安(an)裝(zhuang)固定(ding)裝(zhuang)置組(zu)成。

主要(yao)技術(shu)指標(biao)

測溫范圍和準確度

注：1）t為(wei)被測溫度(du)的******值(zhi)。

鎧裝熱電(dian)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。

鎧裝熱電偶熱響應時間不大(da)于下表的規定：

絕(jue)緣(yuan)電阻

當周圍空氣溫(wen)度(du)為20±15℃，相對濕度(du)不大于80﹪時(shi)，絕(jue)緣(yuan)型鎧裝(zhuang)熱電(dian)(dian)偶(ou)的偶(ou)絲與外套管之間的絕(jue)緣(yuan)電(dian)(dian)阻值(zhi)應符合下表規定。

型號(hao)表(biao)示