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工作原理

鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)的(de)工作(zuo)原理是由兩(liang)種不同成份的(de)導體(ti)兩(liang)端(duan)(duan)經焊接(jie)，形成回路，直接(jie)測(ce)溫(wen)(wen)端(duan)(duan)叫(jiao)測(ce)量端(duan)(duan)，接(jie)線(xian)端(duan)(duan)叫(jiao)參比(bi)端(duan)(duan)。當測(ce)量端(duan)(duan)和參比(bi)端(duan)(duan)存在(zai)溫(wen)(wen)差時，就(jiu)會在(zai)回路中產(chan)生(sheng)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)，接(jie)上(shang)顯示儀表，儀表上(shang)就(jiu)會指示出熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)所(suo)產(chan)生(sheng)的(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢的(de)對應溫(wen)(wen)度(du)值(zhi)。鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)的(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢將隨(sui)著測(ce)量端(duan)(duan)的(de)溫(wen)(wen)度(du)升高而增長(chang)，熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢的(de)大小只和鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)導體(ti)材(cai)質以及兩(liang)端(duan)(duan)溫(wen)(wen)差有(you)關(guan)，和熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)極的(de)長(chang)度(du)，直徑無關(guan)。鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)的(de)結構(gou)是由導體(ti)，絕(jue)緣(yuan)氧化鎂和1Cr18Ni9Ti不銹(xiu)鋼保護管(guan)經多次拉制而成，鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)產(chan)品(pin)主要由接(jie)線(xian)盒，接(jie)線(xian)端(duan)(duan)子和鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)組(zu)成基本結構(gou)，并(bing)配以各種安裝(zhuang)(zhuang)固定裝(zhuang)(zhuang)置(zhi)組(zu)成。

主(zhu)要技術指標

測溫范圍和(he)準確度

注(zhu)：1）t為(wei)被(bei)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。

鎧裝熱電偶熱響應時間不大于下(xia)表的規定：

絕緣電(dian)阻

當周(zhou)圍空氣溫度為20±15℃，相對(dui)濕度不大于(yu)80﹪時，絕(jue)緣型鎧(kai)裝(zhuang)熱(re)電偶的(de)偶絲與(yu)外套管之間(jian)的(de)絕(jue)緣電阻值應符合(he)下表規定(ding)。

型(xing)號表示