熱電偶溫度傳感器 熙正溫度

1、基本介紹

熱電(dian)偶是一種感溫元件，是一種儀表(biao)。它直接測(ce)(ce)量(liang)溫度(du)，并把(ba)溫度(du)信號(hao)(hao)轉換(huan)(huan)成(cheng)(cheng)熱電(dian)動勢信號(hao)(hao), 通過電(dian)氣儀表(biao)（二次儀表(biao)）轉換(huan)(huan)成(cheng)(cheng)被測(ce)(ce)介質(zhi)的(de)(de)溫度(du)。熱電(dian)偶測(ce)(ce)溫的(de)(de)基本(ben)原理(li)是兩種不同成(cheng)(cheng)份的(de)(de)材質(zhi)導體組成(cheng)(cheng)閉合回(hui)路(lu),當兩端存在溫度(du)梯度(du)時,回(hui)路(lu)中(zhong)就會有電(dian)流通過，此時兩端之間就存在電(dian)動勢——熱電(dian)動勢，這就是所(suo)謂的(de)(de)塞貝克效應(Seebeck effect)。兩種(zhong)不(bu)同成(cheng)份的(de)均質導體為熱(re)(re)電(dian)極(ji)，溫度(du)較高(gao)的(de)一端為工(gong)作端，溫度(du)較低的(de)一端為自由端，自由端通常處(chu)于某個(ge)恒定的(de)溫度(du)下。根據(ju)熱(re)(re)電(dian)動勢與溫度(du)的(de)函數關系(xi), 制成(cheng)熱(re)(re)電(dian)偶(ou)(ou)分度(du)表(biao); 分度(du)表(biao)是自由端溫度(du)在0℃時的(de)條件下得到的(de)，不(bu)同的(de)熱(re)(re)電(dian)偶(ou)(ou)具有不(bu)同的(de)分度(du)表(biao)。

在熱(re)電偶回路中(zhong)接入第(di)三(san)種金屬材料(liao)時，只要該材料(liao)兩個接點的溫度(du)相同，熱(re)電偶所產生的熱(re)電勢將保持不變，即不受第(di)三(san)種金屬接入回路中(zhong)的影響。因此，在熱(re)電偶

測(ce)(ce)溫時(shi)，可接(jie)入測(ce)(ce)量儀表(biao)， 測(ce)(ce)得熱(re)電(dian)動勢后(hou)，即可知道被測(ce)(ce)介質的溫度。

2、熱電偶

熱(re)(re)電偶測(ce)量(liang)溫度時(shi)要求(qiu)其冷(leng)(leng)(leng)端(duan)(duan)（測(ce)量(liang)端(duan)(duan)為(wei)熱(re)(re)端(duan)(duan)，通(tong)過引線與(yu)測(ce)量(liang)電路連(lian)接的(de)(de)端(duan)(duan)稱為(wei)冷(leng)(leng)(leng)端(duan)(duan)）的(de)(de)溫度保(bao)持不變(bian)，其熱(re)(re)電勢大小才與(yu)測(ce)量(liang)溫度呈(cheng)一定的(de)(de)比例(li)關系。若(ruo)測(ce)量(liang)時(shi)，冷(leng)(leng)(leng)端(duan)(duan)的(de)(de)（環境）溫度變(bian)化，將嚴重影(ying)響測(ce)量(liang)的(de)(de)準確性。在冷(leng)(leng)(leng)端(duan)(duan)采取一定措施補(bu)償由于冷(leng)(leng)(leng)端(duan)(duan)溫度變(bian)化造成(cheng)的(de)(de)影(ying)響稱為(wei)熱(re)(re)電偶的(de)(de)冷(leng)(leng)(leng)端(duan)(duan)補(bu)償正常(chang)。

附(fu)：熱(re)電(dian)偶冷端(duan)補償計算方法：從毫伏到溫(wen)度(du)：測(ce)量(liang)冷端(duan)溫(wen)度(du)，換算為對應毫伏值(zhi)(zhi)，與熱(re)電(dian)偶的毫伏值(zhi)(zhi)相加(jia)，換算出(chu)溫(wen)度(du)。 從溫(wen)度(du)到毫伏：測(ce)量(liang)出(chu)實(shi)際溫(wen)度(du)與冷端(duan)溫(wen)度(du)，分別換算為毫伏值(zhi)(zhi)，相減後得(de)出(chu)毫伏值(zhi)(zhi)，即得(de)溫(wen)度(du)

3、特點(dian)

◆裝配(pei)簡單(dan)，更換方便

◆壓簧式感(gan)溫(wen)元件，抗震性能好

◆測量范圍大（－200℃～1300℃,特殊情(qing)況(kuang)下(xia)－270℃～2800℃）

◆ 機(ji)械強度(du)高，耐壓(ya)性能好(hao)

◆ 耐高(gao)溫可達2800度

4、構造

熱電偶(ou)的(de)結構形(xing)式為了保(bao)證(zheng)熱電偶(ou)可靠、穩定地工作(zuo)，對它的(de)結構要(yao)求如下：

①組(zu)成熱(re)電偶的(de)兩個熱(re)電極的(de)焊接(jie)必(bi)須牢固；

②兩個熱電極彼此之間應很好地絕(jue)緣(yuan)，以(yi)防短路；

③補償導線與熱電偶(ou)自(zi)由端的連(lian)接(jie)要方便可(ke)靠；

④保護(hu)套管應能保證熱電極與有害(hai)介質充分(fen)隔離。

5、工作原理(li)

兩種(zhong)不(bu)同成(cheng)份的(de)(de)(de)(de)(de)(de)導體（稱為(wei)(wei)(wei)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)絲材(cai)或熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)極）兩端(duan)(duan)接(jie)合成(cheng)回路(lu)(lu)，當兩個接(jie)合點的(de)(de)(de)(de)(de)(de)溫度(du)(du)(du)不(bu)同時(shi)，在(zai)回路(lu)(lu)中就會(hui)產生(sheng)電(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)(shi)，這(zhe)種(zhong)現象稱為(wei)(wei)(wei)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)效(xiao)應，而(er)這(zhe)種(zhong)電(dian)(dian)(dian)(dian)動(dong)(dong)勢(shi)(shi)(shi)稱為(wei)(wei)(wei)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)(shi)。熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)就 是利(li)用這(zhe)種(zhong)原(yuan)理進(jin)行(xing)溫度(du)(du)(du)測(ce)量(liang)(liang)的(de)(de)(de)(de)(de)(de)，其(qi)中，直接(jie)用作(zuo)測(ce)量(liang)(liang)介質(zhi)溫度(du)(du)(du)的(de)(de)(de)(de)(de)(de)一(yi)端(duan)(duan)叫(jiao)做工作(zuo)端(duan)(duan)（也稱為(wei)(wei)(wei)測(ce)量(liang)(liang)端(duan)(duan)），另一(yi)端(duan)(duan)叫(jiao)做冷端(duan)(duan)（也稱為(wei)(wei)(wei)補償(chang)端(duan)(duan)）；冷端(duan)(duan)與顯示儀表或配套(tao)儀表連接(jie)，顯示儀表會(hui)指(zhi)出(chu)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)所(suo)產生(sheng)的(de)(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)(shi)。 　熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)實際上是一(yi)種(zhong)能量(liang)(liang)轉(zhuan)換器，它將熱(re)(re)(re)(re)(re)(re)能轉(zhuan)換為(wei)(wei)(wei)電(dian)(dian)(dian)(dian)能，用所(suo)產生(sheng)的(de)(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)(shi)測(ce)量(liang)(liang)溫度(du)(du)(du)，對(dui)于(yu)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)(shi)，應注意如下幾個問題： 　1：熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)(shi)是熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)工作(zuo)端(duan)(duan)的(de)(de)(de)(de)(de)(de)兩端(duan)(duan)溫度(du)(du)(du)函(han)數的(de)(de)(de)(de)(de)(de)差，而(er)不(bu)是熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)冷端(duan)(duan)與工作(zuo)端(duan)(duan)，兩端(duan)(duan)溫度(du)(du)(du)差的(de)(de)(de)(de)(de)(de)函(han)數； 　2 ：熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)所(suo)產生(sheng)的(de)(de)(de)(de)(de)(de)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)勢(shi)(shi)(shi)的(de)(de)(de)(de)(de)(de)大小，當熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)(de)(de)(de)(de)材(cai)料是均勻時(shi)，與熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)的(de)(de)(de)(de)(de)(de)長度(du)(du)(du)和直徑無關(guan)，只與熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)材(cai)料的(de)(de)(de)(de)(de)(de)成(cheng)份和兩端(duan)(duan)的(de)(de)(de)(de)(de)(de)溫差有關(guan)；

3：當熱(re)電(dian)(dian)(dian)偶的(de)兩(liang)個(ge)熱(re)電(dian)(dian)(dian)偶絲材料成份確定后(hou)，熱(re)電(dian)(dian)(dian)偶熱(re)電(dian)(dian)(dian)勢的(de)大小(xiao)，只與熱(re)電(dian)(dian)(dian)偶的(de)溫(wen)度(du)差有關；若熱(re)電(dian)(dian)(dian)偶冷(leng)端(duan)的(de)溫(wen)度(du)保持(chi)一定，這(zhe)進(jin)熱(re)電(dian)(dian)(dian)偶的(de)熱(re)電(dian)(dian)(dian)勢僅是工(gong)作(zuo)端(duan)溫(wen)度(du)的(de)單值函數。將兩(liang)種不同(tong)材料的(de)導體或半(ban)導體A和(he)B焊接起(qi)來，構成一個(ge)閉合(he)回(hui)路(lu)，如圖所示。當導體A和(he)B的(de)兩(liang)個(ge)執(zhi)著點1和(he)2之(zhi)間存在(zai)溫(wen)差時(shi)，兩(liang)者之(zhi)間便產生電(dian)(dian)(dian)動勢，因而在(zai)回(hui)路(lu)中(zhong)形成一個(ge)大小(xiao)的(de)電(dian)(dian)(dian)流,這(zhe)種現象稱(cheng)為熱(re)電(dian)(dian)(dian)效應(ying)。熱(re)電(dian)(dian)(dian)偶就是利(li)用這(zhe)一效應(ying)來工(gong)作(zuo)的(de)。

6、分類

常(chang)用(yong)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)可分為(wei)標(biao)(biao)(biao)準(zhun)(zhun)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)和(he)非(fei)標(biao)(biao)(biao)準(zhun)(zhun)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)兩大類。所調用(yong)標(biao)(biao)(biao)準(zhun)(zhun)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)是(shi)指(zhi)國家標(biao)(biao)(biao)準(zhun)(zhun)規定了其(qi)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)勢與溫度的(de)關系、允許誤差、并有(you)(you)統一的(de)標(biao)(biao)(biao)準(zhun)(zhun)分度表的(de)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)，它有(you)(you)與其(qi)配套的(de)顯示儀表可供選用(yong)。非(fei)標(biao)(biao)(biao)準(zhun)(zhun)化(hua)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)在使用(yong)范(fan)圍或(huo)數量(liang)級上(shang)均不及標(biao)(biao)(biao)準(zhun)(zhun)化(hua)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)，一般也(ye)沒有(you)(you)統一的(de)分度表，主要用(yong)于某些特殊(shu)場合(he)的(de)測(ce)量(liang)。標(biao)(biao)(biao)準(zhun)(zhun)化(hua)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)我(wo)國從1988年1月1日起，熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)和(he)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻全(quan)部按(an)IEC標(biao)(biao)(biao)準(zhun)(zhun)生產，并S、B、E、K、R、J、T七種標(biao)(biao)(biao)準(zhun)(zhun)化(hua)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)為(wei)我(wo)國統一設計型(xing)熱(re)(re)(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)(ou)。

常用熱電偶型號 熱電偶分度號熱電極材料 使用溫度（ ℃）

S 鉑銠(lao)合金（銠(lao)含量10 %） 純鉑 0-1600

R 鉑銠合(he)金(jin)（銠含量13 %） 純鉑 0-1600

B 鉑銠合金（銠含(han)量(liang)30%） 鉑銠合金（銠含(han)量(liang)6% ） 0-1800

K 鎳鉻鎳硅 0-1300

T 純銅 銅鎳 0-350

J 鐵 銅鎳 0-+500

N 鎳鉻硅 鎳硅 0-+800

E 鎳鉻(ge) 銅(tong)鎳 0-600

熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)的種類: 裝配(pei)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，鎧裝熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，端面熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，壓簧(huang)固定(ding)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，高(gao)溫熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，鉑(bo)銠熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，防腐熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，耐磨熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，高(gao)壓熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，特(te)殊熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，手(shou)持(chi)式熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，微型熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，貴金屬(shu)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou) ,快速熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou),鎢錸熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)，單(dan)芯鎧裝熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)(dian)偶(ou)(ou)等等。

從理論(lun)上講，任何兩(liang)種不(bu)同導(dao)體(ti)（或(huo)半導(dao)體(ti)）都(dou)可(ke)以配(pei)制成(cheng)熱(re)(re)(re)電(dian)(dian)偶，但是(shi)作為(wei)實用的(de)測(ce)(ce)溫(wen)(wen)(wen)元(yuan)件，對(dui)(dui)它(ta)的(de)要求(qiu)是(shi)多方面的(de)。為(wei)了保證工程技術中(zhong)的(de)可(ke)靠性(xing)(xing)，以及(ji)足夠的(de)測(ce)(ce)量(liang)精(jing)度，并(bing)不(bu)是(shi)所有材料都(dou)能組成(cheng)熱(re)(re)(re)電(dian)(dian)偶，一般對(dui)(dui)熱(re)(re)(re)電(dian)(dian)偶的(de)電(dian)(dian)極材料，基本要求(qiu)是(shi)：（1）、在測(ce)(ce)溫(wen)(wen)(wen)范圍內，熱(re)(re)(re)電(dian)(dian)性(xing)(xing)質穩定，不(bu)隨(sui)時間(jian)而變化(hua)，有足夠的(de)物理化(hua)學穩定性(xing)(xing)，不(bu)易(yi)氧化(hua)或(huo)腐蝕；（2）、 電(dian)(dian)阻溫(wen)(wen)(wen)度系數(shu)小，導(dao)電(dian)(dian)率高，比熱(re)(re)(re)小；（3）、測(ce)(ce)溫(wen)(wen)(wen)中(zhong)產生熱(re)(re)(re)電(dian)(dian)勢要大，并(bing)且熱(re)(re)(re)電(dian)(dian)勢與溫(wen)(wen)(wen)度之間(jian)呈(cheng)線性(xing)(xing)或(huo)接(jie)近線性(xing)(xing)的(de)單(dan)值函(han)數(shu)關系；（4）、材料復制性(xing)(xing)好，機械強度高，制造(zao)工藝(yi)簡單(dan)，價格便宜。

7、選型(xing)標準(zhun)

選擇熱電偶(ou)要根據(ju)使用(yong)溫度范圍(wei)、所需(xu)精度、使用(yong)氣氛、測定(ding)對象的性能、響應時間(jian)和(he)經(jing)濟(ji)效(xiao)益等綜合考慮。

1、測量精度和溫度測量范圍的選擇

使用(yong)(yong)(yong)溫(wen)度(du)(du)(du)(du)在1300~1800℃，要(yao)求(qiu)精(jing)度(du)(du)(du)(du)又比較(jiao)高時(shi)，一(yi)般(ban)選用(yong)(yong)(yong)B型(xing)熱(re)(re)(re)電(dian)偶(ou)；要(yao)求(qiu)精(jing)度(du)(du)(du)(du)不高，氣氛又允(yun)許可用(yong)(yong)(yong)鎢錸熱(re)(re)(re)電(dian)偶(ou)，高于1800℃一(yi)般(ban)選用(yong)(yong)(yong)鎢錸熱(re)(re)(re)電(dian)偶(ou)；使用(yong)(yong)(yong)溫(wen)度(du)(du)(du)(du)在1000~1300℃要(yao)求(qiu)精(jing)度(du)(du)(du)(du)又比較(jiao)高可用(yong)(yong)(yong)S型(xing)熱(re)(re)(re)電(dian)偶(ou)和(he)N型(xing)熱(re)(re)(re)電(dian)偶(ou)；在1000℃以下一(yi)般(ban)用(yong)(yong)(yong)K型(xing)熱(re)(re)(re)電(dian)偶(ou)和(he)N型(xing)熱(re)(re)(re)電(dian)偶(ou)，低(di)于400℃一(yi)般(ban)用(yong)(yong)(yong)E型(xing)熱(re)(re)(re)電(dian)偶(ou)；250℃下以及負(fu)溫(wen)測量一(yi)般(ban)用(yong)(yong)(yong)T型(xing)電(dian)偶(ou)，在低(di)溫(wen)時(shi)T型(xing)熱(re)(re)(re)電(dian)偶(ou)穩定而且精(jing)度(du)(du)(du)(du)高。

2、使用氣氛的選擇

S型、B型、K型熱電偶適合于強的(de)氧(yang)化和(he)(he)弱(ruo)的(de)還原氣(qi)氛(fen)中使用，J型和(he)(he)T型熱電偶適合于弱(ruo)氧(yang)化和(he)(he)還原氣(qi)氛(fen)，若使用氣(qi)密性比較好的(de)保護管，對氣(qi)氛(fen)的(de)要(yao)求就不太嚴格。

3、耐久性及熱響應性的選擇

線(xian)徑大的(de)熱電偶(ou)耐(nai)久性好(hao)，但響(xiang)應(ying)(ying)較慢一些，對于(yu)熱容(rong)量大的(de)熱電偶(ou)，響(xiang)應(ying)(ying)就慢，測量梯度大的(de)溫(wen)度時，在溫(wen)度控(kong)制的(de)情(qing)況下，控(kong)溫(wen)就差。要求響(xiang)應(ying)(ying)時間(jian)快又要求有一定的(de)耐(nai)久性，選擇鎧裝(zhuang)偶(ou)比較合適(shi)。

4、測量對象的性質和狀態對熱電偶的選擇

運動物體(ti)、振動物體(ti)、高壓容器(qi)的(de)測溫要求(qiu)機械強度高，有(you)化學污(wu)染的(de)氣(qi)氛要求(qiu)有(you)保(bao)護管(guan)，有(you)電(dian)氣(qi)干擾的(de)情況下要求(qiu)絕緣比較高。

選型流程(cheng)：型號--分(fen)度號—防爆等級(ji)—精度等級(ji)—安裝固定形式—保護管材質(zhi)—長度或插入深度

產品選型及訂貨須知：

1、在選用(yong)及訂(ding)貨時，請注明：

2 產品型號

2 分度號

2 保護管材料及直徑

2 保護管總長L及置入深度I

2 固定裝置型式

2 產品實際測量范圍

2、螺紋式(shi)固(gu)定(ding)裝(zhuang)置型式(shi)在訂貨(huo)時不標(biao)注(zhu)均為固(gu)定(ding)外螺紋M27×2，（其余螺紋固(gu)定(ding)型式(shi)均需注(zhu)明(ming)）

3、因(yin)用戶(hu)特殊需(xu)要而與上述產(chan)品型號不符者，需(xu)要專門制造的(de)產(chan)品，請注明您(nin)的(de)特殊技術要求(qiu)，來（或函）與我公司(si)有關責任部門特殊訂貨。

熱電偶傳感器冷端的溫度補償

由(you)于(yu)熱(re)(re)電(dian)偶(ou)的材料一般都比(bi)(bi)較貴(gui)重(zhong)（特別(bie)是采(cai)用(yong)(yong)(yong)(yong)貴(gui)金屬時(shi)），而測(ce)溫(wen)點(dian)到(dao)儀表(biao)的距離都很遠，為了(le)節省熱(re)(re)電(dian)偶(ou)材料，降低成本(ben)，通常采(cai)用(yong)(yong)(yong)(yong)補(bu)償(chang)(chang)導線把熱(re)(re)電(dian)偶(ou)的冷(leng)端(duan)(duan)（自由(you)端(duan)(duan)）延伸到(dao)溫(wen)度比(bi)(bi)較穩定的控(kong)制室內(nei)，連(lian)(lian)接(jie)到(dao)儀表(biao)端(duan)(duan)子(zi)上。必須(xu)指(zhi)出，熱(re)(re)電(dian)偶(ou)補(bu)償(chang)(chang)導線的作用(yong)(yong)(yong)(yong)只起(qi)延伸熱(re)(re)電(dian)極(ji)，使熱(re)(re)電(dian)偶(ou)的冷(leng)端(duan)(duan)移動到(dao)控(kong)制室的儀表(biao)端(duan)(duan)子(zi)上，它本(ben)身并不(bu)能(neng)消除(chu)冷(leng)端(duan)(duan)溫(wen)度變(bian)化(hua)對(dui)測(ce)溫(wen)的影響(xiang)，不(bu)起(qi)補(bu)償(chang)(chang)作用(yong)(yong)(yong)(yong)。因此，還需采(cai)用(yong)(yong)(yong)(yong)其他(ta)修正(zheng)方法來補(bu)償(chang)(chang)冷(leng)端(duan)(duan)溫(wen)度t0≠0℃時(shi)對(dui)測(ce)溫(wen)的影響(xiang)。在(zai)使用(yong)(yong)(yong)(yong)熱(re)(re)電(dian)偶(ou)補(bu)償(chang)(chang)導線時(shi)必須(xu)注意型號相配，極(ji)性不(bu)能(neng)接(jie)錯，補(bu)償(chang)(chang)導線與熱(re)(re)電(dian)偶(ou)連(lian)(lian)接(jie)端(duan)(duan)的溫(wen)度不(bu)能(neng)超過100℃。

熱電偶溫度傳感器 熙正溫度