一體化溫(wen)(wen)度(du)變(bian)送器一般由測溫(wen)(wen)探(tan)頭（熱(re)電(dian)偶(ou)或熱(re)電(dian)阻傳感(gan)器）和兩(liang)線(xian)制固(gu)體電(dian)子單(dan)元組成(cheng)。采用(yong)固(gu)體模塊形(xing)式將測溫(wen)(wen)探(tan)頭直(zhi)接(jie)安裝在接(jie)線(xian)盒內，從而形(xing)成(cheng)一體化的變(bian)送器。一體化溫(wen)(wen)度(du)變(bian)送器一般分為熱(re)電(dian)阻和熱(re)電(dian)偶(ou)型兩(liang)種類型。

熱(re)電(dian)(dian)阻溫(wen)度(du)變送器是(shi)由基準單(dan)元(yuan)(yuan)(yuan)、R/V轉換(huan)單(dan)元(yuan)(yuan)(yuan)、線性(xing)電(dian)(dian)路(lu)(lu)、反接保護(hu)、限流(liu)保護(hu)、V/I轉換(huan)單(dan)元(yuan)(yuan)(yuan)等組成。測(ce)(ce)溫(wen)熱(re)電(dian)(dian)阻信(xin)號(hao)轉換(huan)放大后，再由線性(xing)電(dian)(dian)路(lu)(lu)對溫(wen)度(du)與電(dian)(dian)阻的(de)(de)(de)非(fei)線性(xing)關系(xi)進(jin)行補償，經V/I轉換(huan)電(dian)(dian)路(lu)(lu)后輸出一個與被(bei)測(ce)(ce)溫(wen)度(du)成線性(xing)關系(xi)的(de)(de)(de)4～20mA的(de)(de)(de)恒流(liu)信(xin)號(hao)。

熱電(dian)(dian)偶(ou)溫(wen)度變送(song)器一(yi)般(ban)由(you)基(ji)準源(yuan)、冷端(duan)補(bu)償(chang)、放(fang)大單元、線(xian)性(xing)化處理、V/I轉換、斷(duan)(duan)偶(ou)處理、反(fan)接(jie)保護、限流(liu)保護等電(dian)(dian)路(lu)單元組成。它(ta)是將熱電(dian)(dian)偶(ou)產生的(de)熱電(dian)(dian)勢(shi)(shi)經(jing)冷端(duan)補(bu)償(chang)放(fang)大后(hou)，再帽(mao)由(you)線(xian)性(xing)電(dian)(dian)路(lu)消除熱電(dian)(dian)勢(shi)(shi)與溫(wen)度的(de)非(fei)線(xian)性(xing)誤差，zui后(hou)放(fang)大轉換為(wei)4～20mA電(dian)(dian)流(liu)輸(shu)出信號(hao)。為(wei)防止(zhi)熱電(dian)(dian)偶(ou)測(ce)量(liang)中由(you)于電(dian)(dian)偶(ou)斷(duan)(duan)絲而使控(kong)溫(wen)失(shi)效造成事故，變送(song)器中還設有(you)斷(duan)(duan)電(dian)(dian)保護電(dian)(dian)路(lu)。當熱電(dian)(dian)偶(ou)斷(duan)(duan)絲或接(jie)解不良時(shi)，變送(song)器會輸(shu)出zui大值（28mA）以使儀表(biao)切斷(duan)(duan)電(dian)(dian)源(yuan)。

一體化(hua)溫(wen)度變送器(qi)具有(you)結構簡(jian)單、節省(sheng)引線(xian)、輸出信號大(da)、抗干擾能(neng)力強、線(xian)性好(hao)、顯示儀表簡(jian)單、固體模(mo)塊抗震防潮、有(you)反接保護(hu)和限流保護(hu)、工作可靠等優點。

一(yi)體化溫度變(bian)送器的輸出為統(tong)一(yi)的4～20mA信(xin)號；可(ke)與微(wei)機系(xi)統(tong)或其它常規儀表(biao)匹配使用。也(ye)可(ke)用戶要(yao)求做成(cheng)防爆型(xing)或防火型(xing)測量儀表(biao)。