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工(gong)作原理

熱(re)電(dian)(dian)(dian)(dian)(dian)偶的工作(zuo)原理(li)是：兩(liang)種不同(tong)成分的導體(ti)(ti)兩(liang)端(duan)(duan)(duan)(duan)經焊接、形成回(hui)路，直接測(ce)溫(wen)(wen)(wen)端(duan)(duan)(duan)(duan)叫(jiao)測(ce)量端(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)。當測(ce)量端(duan)(duan)(duan)(duan)和(he)參(can)比端(duan)(duan)(duan)(duan)存在(zai)溫(wen)(wen)(wen)差(cha)時，就(jiu)會在(zai)回(hui)路中產(chan)生(sheng)熱(re)電(dian)(dian)(dian)(dian)(dian)勢，接上顯示儀表，儀表上就(jiu)指示出熱(re)電(dian)(dian)(dian)(dian)(dian)偶所產(chan)生(sheng)的熱(re)電(dian)(dian)(dian)(dian)(dian)動(dong)勢的對應溫(wen)(wen)(wen)度(du)值(zhi)。熱(re)電(dian)(dian)(dian)(dian)(dian)偶的熱(re)電(dian)(dian)(dian)(dian)(dian)動(dong)勢將隨(sui)著測(ce)量端(duan)(duan)(duan)(duan)溫(wen)(wen)(wen)度(du)升高(gao)而增長，熱(re)電(dian)(dian)(dian)(dian)(dian)動(dong)勢的大(da)小只與熱(re)電(dian)(dian)(dian)(dian)(dian)偶導體(ti)(ti)材(cai)質以及(ji)兩(liang)端(duan)(duan)(duan)(duan)溫(wen)(wen)(wen)差(cha)有關，與熱(re)電(dian)(dian)(dian)(dian)(dian)極的長度(du)、直徑無關。

主要技術(shu)指標

溫度測量范(fan)圍和允(yun)許誤差

   注“t”為(wei)感溫元件實測(ce)溫度

熱響(xiang)應時間(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(dian)偶(ou)公稱壓力　

一般是指(zhi)在室溫情(qing)況(kuang)下保(bao)(bao)護管(guan)所能承(cheng)受的(de)(de)靜態外(wai)壓(ya)而不(bu)(bu)破(po)裂。實際上，容許工作壓(ya)力不(bu)(bu)僅(jin)與保(bao)(bao)護管(guan)材料、直(zhi)徑(jing)壁厚有(you)關(guan)，還(huan)與其結構(gou)形式(shi)，安裝方(fang)法、置(zhi)入深度(du)以及被測(ce)介質(zhi)的(de)(de)流速和種(zhong)類等(deng)有(you)關(guan)。應(ying)不(bu)(bu)小于其保(bao)(bao)護管(guan)外(wai)徑(jing)的(de)(de)8～10倍（特殊產品(pin)例外(wai)）。

熱電偶絕緣電阻（常(chang)溫） 　　

常(chang)溫絕(jue)緣(yuan)電(dian)阻的(de)試驗電(dian)壓為(wei)直流500V±50V，測量常(chang)溫絕(jue)緣(yuan)電(dian)阻的(de)大(da)氣條件(jian)為(wei)溫度15～35℃，相對(dui)濕度45%，大(da)氣壓力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(qi)長度(du)的乘積應不(bu)小于(yu)100.

即Rr.L≥100 MΩ。M L＞1m

式中：Rr-熱(re)電(dian)偶的常(chang)溫絕緣電(dian)阻值MΩ

b.對于長度等于或(huo)不足1米的熱電偶(ou)，它的常(chang)溫絕緣(yuan)電阻值應不小于100 MΩ

上限溫度絕緣電阻(zu) 　　

熱(re)電偶的上限溫度絕緣(yuan)電阻應(ying)不小于下表現定(ding)：

型(xing)號表示