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工作(zuo)原理(li)

鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)工作原理是(shi)由(you)兩種(zhong)(zhong)不同成(cheng)份的(de)(de)導體兩端(duan)(duan)(duan)經(jing)焊(han)接(jie)(jie)，形成(cheng)回路，直(zhi)接(jie)(jie)測溫端(duan)(duan)(duan)叫測量端(duan)(duan)(duan)，接(jie)(jie)線端(duan)(duan)(duan)叫參比端(duan)(duan)(duan)。當測量端(duan)(duan)(duan)和參比端(duan)(duan)(duan)存在溫差(cha)時(shi)，就會在回路中產生(sheng)熱(re)(re)電(dian)(dian)(dian)(dian)流，接(jie)(jie)上顯(xian)示(shi)(shi)儀表，儀表上就會指示(shi)(shi)出熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)所產生(sheng)的(de)(de)熱(re)(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)(shi)的(de)(de)對應溫度值(zhi)。鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)熱(re)(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)(shi)將(jiang)隨著(zhu)測量端(duan)(duan)(duan)的(de)(de)溫度升高而增長(chang)，熱(re)(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)(shi)(shi)的(de)(de)大小只(zhi)和鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)導體材質以及兩端(duan)(duan)(duan)溫差(cha)有關，和熱(re)(re)電(dian)(dian)(dian)(dian)極的(de)(de)長(chang)度，直(zhi)徑無關。鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)結構(gou)是(shi)由(you)導體，絕緣氧化鎂(mei)和1Cr18Ni9Ti不銹鋼保(bao)護管經(jing)多(duo)次拉制而成(cheng)，鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)產品(pin)主要由(you)接(jie)(jie)線盒，接(jie)(jie)線端(duan)(duan)(duan)子(zi)和鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)(zhuang)熱(re)(re)電(dian)(dian)(dian)(dian)偶(ou)組成(cheng)基本結構(gou)，并配以各種(zhong)(zhong)安裝(zhuang)(zhuang)(zhuang)(zhuang)固定裝(zhuang)(zhuang)(zhuang)(zhuang)置(zhi)組成(cheng)。

主要技術指標

測溫范圍和準確度

注(zhu)：1）t為(wei)被測溫度的******值。

鎧裝熱(re)電偶熱(re)響(xiang)應(ying)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(yu)下表的規(gui)定：

絕緣電(dian)阻

當周圍空氣溫度為20±15℃，相對濕(shi)度不大于80﹪時，絕緣型(xing)鎧裝熱電(dian)偶(ou)的(de)偶(ou)絲(si)與外套管之(zhi)間的(de)絕緣電(dian)阻值應符合(he)下表規定。

型(xing)號表示