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工作原理(li)

鎧(kai)(kai)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)工作原理是由(you)(you)兩(liang)(liang)種不同成(cheng)份的(de)(de)(de)導體兩(liang)(liang)端(duan)經焊接(jie)(jie)，形成(cheng)回路，直(zhi)接(jie)(jie)測溫端(duan)叫(jiao)測量端(duan)，接(jie)(jie)線(xian)端(duan)叫(jiao)參比端(duan)。當測量端(duan)和(he)(he)(he)參比端(duan)存在溫差(cha)時(shi)，就(jiu)會在回路中產生熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)流，接(jie)(jie)上顯示儀表，儀表上就(jiu)會指示出(chu)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶所(suo)產生的(de)(de)(de)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)動勢的(de)(de)(de)對應溫度值。鎧(kai)(kai)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)動勢將隨著測量端(duan)的(de)(de)(de)溫度升(sheng)高而(er)增長，熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)動勢的(de)(de)(de)大小只和(he)(he)(he)鎧(kai)(kai)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶導體材質(zhi)以(yi)及兩(liang)(liang)端(duan)溫差(cha)有關，和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)極的(de)(de)(de)長度，直(zhi)徑無關。鎧(kai)(kai)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)結構是由(you)(you)導體，絕緣氧化鎂和(he)(he)(he)1Cr18Ni9Ti不銹鋼保護管(guan)經多次拉制而(er)成(cheng)，鎧(kai)(kai)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶產品主要由(you)(you)接(jie)(jie)線(xian)盒(he)，接(jie)(jie)線(xian)端(duan)子和(he)(he)(he)鎧(kai)(kai)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶組成(cheng)基本(ben)結構，并配以(yi)各種安裝(zhuang)固定裝(zhuang)置組成(cheng)。

主(zhu)要(yao)技術指(zhi)標(biao)

測溫(wen)范圍和準確度

注(zhu)：1）t為被測溫度的(de)******值。

鎧裝熱(re)電偶熱(re)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(dian)偶(ou)熱(re)響(xiang)應時間(jian)不大于下表的規定：

絕緣電阻

當周圍空氣(qi)溫度(du)為20±15℃，相對濕度(du)不大(da)于(yu)80﹪時，絕緣(yuan)型鎧裝熱(re)電偶(ou)的偶(ou)絲與外套管之間(jian)的絕緣(yuan)電阻值(zhi)應符合(he)下表規定。

型(xing)號表(biao)示(shi)