工作原理

鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)工作原理是由兩(liang)(liang)種不(bu)同成(cheng)份(fen)的(de)(de)導(dao)體(ti)兩(liang)(liang)端經焊(han)接(jie)，形成(cheng)回路，直(zhi)接(jie)測溫(wen)端叫測量端，接(jie)線端叫參比端。當測量端和參比端存在(zai)溫(wen)差時(shi)，就會(hui)在(zai)回路中產(chan)生(sheng)熱(re)(re)(re)電(dian)(dian)(dian)(dian)流，接(jie)上(shang)顯示儀表(biao)，儀表(biao)上(shang)就會(hui)指示出熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)所產(chan)生(sheng)的(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)(de)對(dui)應溫(wen)度(du)值。鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)將隨(sui)著測量端的(de)(de)溫(wen)度(du)升高而增(zeng)長，熱(re)(re)(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)(de)大小只(zhi)和鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)導(dao)體(ti)材質以及兩(liang)(liang)端溫(wen)差有關，和熱(re)(re)(re)電(dian)(dian)(dian)(dian)極的(de)(de)長度(du)，直(zhi)徑無關。鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)(de)結(jie)構(gou)是由導(dao)體(ti)，絕緣氧(yang)化(hua)鎂和1Cr18Ni9Ti不(bu)銹鋼(gang)保(bao)護管(guan)經多次拉制而成(cheng)，鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)產(chan)品主要(yao)由接(jie)線盒(he)，接(jie)線端子和鎧(kai)(kai)裝(zhuang)(zhuang)(zhuang)熱(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)組成(cheng)基(ji)本結(jie)構(gou)，并(bing)配(pei)以各種安裝(zhuang)(zhuang)(zhuang)固定(ding)裝(zhuang)(zhuang)(zhuang)置(zhi)組成(cheng)。

主(zhu)要技術指標(biao)

測溫范(fan)圍和準確度

注：1）t為被(bei)測溫度的******值。

鎧裝熱電偶熱響應時(shi)間(jian)

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)(re)電偶熱(re)(re)響應(ying)時間不(bu)大于下(xia)表的(de)規定：

絕緣電阻

當周圍空氣溫度(du)為20±15℃，相對(dui)濕(shi)度(du)不大于80﹪時，絕緣(yuan)型(xing)鎧(kai)裝熱電偶(ou)的(de)偶(ou)絲與外套管之間(jian)的(de)絕緣(yuan)電阻值應符合下表規定。

型(xing)號表(biao)示