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工作原理

熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶的(de)(de)工作原(yuan)理(li)是(shi)：兩(liang)(liang)種不同成(cheng)分的(de)(de)導體(ti)兩(liang)(liang)端(duan)(duan)(duan)(duan)經焊接、形成(cheng)回(hui)路，直接測溫(wen)端(duan)(duan)(duan)(duan)叫(jiao)測量(liang)(liang)端(duan)(duan)(duan)(duan)，接線端(duan)(duan)(duan)(duan)子端(duan)(duan)(duan)(duan)叫(jiao)參(can)比端(duan)(duan)(duan)(duan)。當(dang)測量(liang)(liang)端(duan)(duan)(duan)(duan)和參(can)比端(duan)(duan)(duan)(duan)存在(zai)溫(wen)差時，就(jiu)會在(zai)回(hui)路中(zhong)產(chan)生熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)勢(shi)，接上(shang)顯示儀表，儀表上(shang)就(jiu)指示出熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶所產(chan)生的(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)(de)對(dui)應溫(wen)度值。熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶的(de)(de)熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢(shi)將隨(sui)著測量(liang)(liang)端(duan)(duan)(duan)(duan)溫(wen)度升(sheng)高(gao)而(er)增長(chang)，熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)(de)大小只與熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶導體(ti)材質以(yi)及兩(liang)(liang)端(duan)(duan)(duan)(duan)溫(wen)差有關，與熱(re)電(dian)(dian)(dian)(dian)(dian)(dian)極的(de)(de)長(chang)度、直徑無關。

主(zhu)要(yao)技術指標

溫度測量范圍和允許誤差(cha)

   注“t”為感溫(wen)元件實測溫(wen)度

熱(re)響(xiang)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變化的50%，所需要的時間稱為熱響應時間，用T_0.5表示。

熱電偶(ou)公稱壓力　

一般(ban)是指在室溫情(qing)況下保護管(guan)(guan)所(suo)能(neng)承受(shou)的靜態外壓(ya)而不(bu)破裂。實際上，容許工作(zuo)壓(ya)力不(bu)僅與(yu)保護管(guan)(guan)材料、直徑(jing)(jing)壁厚(hou)有(you)關，還與(yu)其結構形式，安(an)裝方法、置入深度以及(ji)被(bei)測介質的流(liu)速和種類等有(you)關。應(ying)不(bu)小于其保護管(guan)(guan)外徑(jing)(jing)的8～10倍（特(te)殊產(chan)品例外）。

熱電(dian)偶絕緣電(dian)阻（常溫(wen)） 　　

常溫絕緣電(dian)阻(zu)的試驗電(dian)壓(ya)(ya)為直流500V±50V，測量(liang)常溫絕緣電(dian)阻(zu)的大氣(qi)條件(jian)為溫度15～35℃，相對濕度45%，大氣(qi)壓(ya)(ya)力86～106kPa。

a.對于(yu)長度(du)超過1米的熱(re)電(dian)偶它的常溫絕緣電(dian)阻值與其長度(du)的乘(cheng)積應(ying)不小于(yu)100.

即Rr.L≥100 MΩ。M L＞1m

式中：Rr-熱電偶的常溫絕緣電阻值MΩ

b.對(dui)于長(chang)度等于或不(bu)足1米(mi)的熱(re)電偶，它(ta)的常溫(wen)絕(jue)緣電阻值應不(bu)小于100 MΩ

上限溫度絕緣(yuan)電阻 　　

熱電(dian)偶的上限(xian)溫度絕緣電(dian)阻應不小于下表現定：

型號表示