KX-VVP熱電偶補償導線生產執行標準：GB/T4989-94及JB/T7495-94
補(bu)償導(dao)線(xian)(xian)是(shi)在一(yi)定溫度(du)(du)范圍內(nei)（0~100℃）具有與(yu)所匹配熱電偶熱電動勢相同(tong)標稱(cheng)值的(de)(de)(de)一(yi)對(dui)帶有絕緣層(ceng)的(de)(de)(de)導(dao)線(xian)(xian)，用(yong)它(ta)們連(lian)接熱電偶與(yu)測量裝置，以(yi)補(bu)償它(ta)們與(yu)熱電偶連(lian)接處(chu)的(de)(de)(de)溫度(du)(du)變化所產生的(de)(de)(de)誤差。 

KX-VVP熱(re)電(dian)偶補(bu)償導線(xian)適用于(yu)分(fen)度(du)號(hao)為(wei)K型熱(re)電(dian)偶與溫度(du)顯示(shi)儀表(biao)之間的電(dian)氣連接，以(yi)提高測(ce)溫精度(du)。

KX-VVP熱電偶補(bu)(bu)償(chang)導線分為(wei)延長性(xing)與補(bu)(bu)償(chang)型。

KX-VVP熱電偶(ou)補償導線的作用

要(yao)(yao)了解熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)溫度(du)(du)(du)補償問題，就要(yao)(yao)從熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)原理作手，現(xian)只談談與之相關(guan)的(de)(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶閉合回路的(de)(de)(de)總(zong)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)勢和中(zhong)間(jian)溫度(du)(du)(du)定(ding)(ding)(ding)則。前(qian)者說明了:對(dui)于已選定(ding)(ding)(ding)的(de)(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶，當(dang)參比端(duan)(duan)溫度(du)(du)(du)恒(heng)定(ding)(ding)(ding)時(shi)，則總(zong)的(de)(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)動勢就成(cheng)測量(liang)端(duan)(duan)溫度(du)(du)(du)的(de)(de)(de)單值(zhi)函數。即一定(ding)(ding)(ding)的(de)(de)(de)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)勢對(dui)應(ying)著一定(ding)(ding)(ding)的(de)(de)(de)溫度(du)(du)(du)，而(er)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)分度(du)(du)(du)表中(zhong)，參比端(duan)(duan)溫度(du)(du)(du)均為0度(du)(du)(du)。但在應(ying)用現(xian)場，參比端(duan)(duan)溫度(du)(du)(du)千差萬(wan)別，不可(ke)能都恒(heng)定(ding)(ding)(ding)在0度(du)(du)(du)，這(zhe)就會(hui)產生(sheng)測量(liang)誤差，這(zhe)就是熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶要(yao)(yao)進行溫度(du)(du)(du)補償的(de)(de)(de)原因。在實際應(ying)用中(zhong)常(chang)把熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)參比端(duan)(duan)稱(cheng)為冷端(duan)(duan)。

熱電偶冷(leng)端(duan)溫度補償(chang)的方法有:

1．冰浴(yu)法 常用在(zai)實驗室(shi)，即把參(can)比端溫度恒(heng)定在(zai)0度，但做起來成(cheng)本高(gao)、難度大。

2．冷端溫(wen)度(du)(du)校(xiao)正法(fa) 常用在要(yao)求不高的(de)現(xian)場，即當(dang)冷端溫(wen)度(du)(du)無法(fa)恒定(ding)為0度(du)(du)，就需要(yao)對儀表的(de)指示值進行修正。做起來容易但誤差較大。

3．補(bu)償電(dian)(dian)橋法較少單(dan)獨使(shi)用(yong)，是利用(yong)不平衡(heng)電(dian)(dian)橋產(chan)生的(de)電(dian)(dian)勢(shi)來(lai)補(bu)償熱(re)電(dian)(dian)偶冷端溫度變化所引起的(de)熱(re)電(dian)(dian)勢(shi)變化值。補(bu)償電(dian)(dian)橋有單(dan)獨產(chan)品，也有做在儀表內的(de)。

4．補(bu)(bu)(bu)償(chang)導線法這(zhe)是(shi)zui常(chang)(chang)用(yong)(yong)的(de)(de)(de)方法，即(ji)把(ba)熱(re)電(dian)(dian)偶(ou)(ou)延(yan)長把(ba)冷(leng)端引(yin)至(zhi)(zhi)溫(wen)度較穩(wen)定(ding)(ding)的(de)(de)(de)地(di)方(通(tong)常(chang)(chang)為(wei)控制室(shi))，然后由(you)人(ren)工來(lai)調正冷(leng)端溫(wen)度，即(ji)把(ba)儀表(biao)(biao)零點調至(zhi)(zhi)室(shi)溫(wen)，或由(you)儀表(biao)(biao)內電(dian)(dian)路進行自(zi)(zi)動補(bu)(bu)(bu)償(chang)。對(dui)于(yu)貴金屬(shu)熱(re)電(dian)(dian)偶(ou)(ou)把(ba)熱(re)電(dian)(dian)偶(ou)(ou)延(yan)長也是(shi)不可能的(de)(de)(de)，因為(wei)價格(ge)太高行不通(tong)，就用(yong)(yong)熱(re)電(dian)(dian)特性相近的(de)(de)(de)賤金屬(shu)來(lai)做延(yan)長導線，中間溫(wen)度定(ding)(ding)則是(shi)應(ying)用(yong)(yong)補(bu)(bu)(bu)償(chang)導線的(de)(de)(de)理(li)論(lun)基(ji)礎。補(bu)(bu)(bu)償(chang)導線并(bing)不能自(zi)(zi)動補(bu)(bu)(bu)償(chang)熱(re)電(dian)(dian)偶(ou)(ou)冷(leng)端溫(wen)度的(de)(de)(de)變化，僅只是(shi)將熱(re)電(dian)(dian)偶(ou)(ou)冷(leng)端引(yin)至(zhi)(zhi)溫(wen)度較穩(wen)定(ding)(ding)的(de)(de)(de)地(di)方而已(yi)，補(bu)(bu)(bu)償(chang)還要由(you)人(ren)工和儀表(biao)(biao)來(lai)進行。因此補(bu)(bu)(bu)償(chang)導線應(ying)該叫做熱(re)電(dian)(dian)偶(ou)(ou)延(yan)長線，這(zhe)樣(yang)才不會給人(ren)造(zao)成錯誤(wu)的(de)(de)(de)理(li)解(jie)。