工作(zuo)原理(li)

鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶的(de)工(gong)作原理是由兩(liang)種不同(tong)成(cheng)份的(de)導體兩(liang)端(duan)(duan)經焊(han)接，形成(cheng)回(hui)路(lu)，直(zhi)接測(ce)溫(wen)端(duan)(duan)叫(jiao)測(ce)量端(duan)(duan)，接線(xian)(xian)端(duan)(duan)叫(jiao)參(can)(can)比端(duan)(duan)。當(dang)測(ce)量端(duan)(duan)和參(can)(can)比端(duan)(duan)存在(zai)溫(wen)差(cha)時，就(jiu)會(hui)在(zai)回(hui)路(lu)中產生熱(re)(re)電(dian)(dian)(dian)(dian)流，接上顯示儀表，儀表上就(jiu)會(hui)指示出熱(re)(re)電(dian)(dian)(dian)(dian)偶所產生的(de)熱(re)(re)電(dian)(dian)(dian)(dian)動勢(shi)的(de)對(dui)應溫(wen)度值。鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶的(de)熱(re)(re)電(dian)(dian)(dian)(dian)動勢(shi)將(jiang)隨著測(ce)量端(duan)(duan)的(de)溫(wen)度升高而(er)增長，熱(re)(re)電(dian)(dian)(dian)(dian)動勢(shi)的(de)大小只和鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶導體材質以及(ji)兩(liang)端(duan)(duan)溫(wen)差(cha)有關(guan)，和熱(re)(re)電(dian)(dian)(dian)(dian)極的(de)長度，直(zhi)徑無關(guan)。鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶的(de)結(jie)構是由導體，絕緣氧化鎂和1Cr18Ni9Ti不銹(xiu)鋼保護(hu)管(guan)經多(duo)次拉制而(er)成(cheng)，鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶產品(pin)主要由接線(xian)(xian)盒，接線(xian)(xian)端(duan)(duan)子和鎧(kai)(kai)(kai)裝(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶組(zu)成(cheng)基(ji)本結(jie)構，并配以各種安(an)裝(zhuang)(zhuang)固定裝(zhuang)(zhuang)置組(zu)成(cheng)。

主(zhu)要(yao)技術指標

測(ce)溫范圍和(he)準確(que)度

注：1）t為被測溫(wen)度的******值。

鎧裝熱電(dian)偶熱響應時(shi)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)裝熱電偶熱響應(ying)時間不大于下表的規定：

絕緣電阻(zu)

當周圍空氣溫度為20±15℃，相對(dui)濕度不大于80﹪時，絕緣型(xing)鎧裝(zhuang)熱電偶的偶絲與外套(tao)管之(zhi)間的絕緣電阻值應符合下表規定。

型(xing)號表示