一(yi)體(ti)(ti)化溫(wen)度變(bian)送(song)器(qi)一(yi)般(ban)由測(ce)(ce)溫(wen)探頭（熱電(dian)(dian)偶或(huo)熱電(dian)(dian)阻(zu)傳感器(qi)）和兩線(xian)(xian)制固體(ti)(ti)電(dian)(dian)子單元組成(cheng)。采用固體(ti)(ti)模塊形式將測(ce)(ce)溫(wen)探頭直接安裝(zhuang)在接線(xian)(xian)盒(he)內，從(cong)而形成(cheng)一(yi)體(ti)(ti)化的變(bian)送(song)器(qi)。一(yi)體(ti)(ti)化溫(wen)度變(bian)送(song)器(qi)一(yi)般(ban)分(fen)為熱電(dian)(dian)阻(zu)和熱電(dian)(dian)偶型(xing)兩種類型(xing)。

熱電(dian)(dian)阻溫度變送器是由基準(zhun)單元(yuan)(yuan)、R/V轉換單元(yuan)(yuan)、線(xian)性(xing)電(dian)(dian)路、反接保(bao)護、限流保(bao)護、V/I轉換單元(yuan)(yuan)等組成。測溫熱電(dian)(dian)阻信(xin)號轉換放大(da)后，再由線(xian)性(xing)電(dian)(dian)路對溫度與電(dian)(dian)阻的非線(xian)性(xing)關系進行(xing)補償，經V/I轉換電(dian)(dian)路后輸出一個與被測溫度成線(xian)性(xing)關系的4～20mA的恒流信(xin)號。

熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)溫(wen)度變(bian)送器(qi)一般由基準源(yuan)、冷(leng)端補償、放(fang)大(da)(da)單元、線性化處(chu)理、V/I轉(zhuan)換、斷偶(ou)處(chu)理、反接保護(hu)、限流保護(hu)等電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)單元組成(cheng)。它(ta)是將熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)產生的(de)熱(re)電(dian)(dian)(dian)(dian)(dian)勢(shi)(shi)經冷(leng)端補償放(fang)大(da)(da)后，再帽由線性電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)消除熱(re)電(dian)(dian)(dian)(dian)(dian)勢(shi)(shi)與溫(wen)度的(de)非(fei)線性誤差(cha)，zui后放(fang)大(da)(da)轉(zhuan)換為(wei)4～20mA電(dian)(dian)(dian)(dian)(dian)流輸出信號。為(wei)防止熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)測量中由于電(dian)(dian)(dian)(dian)(dian)偶(ou)斷絲而使控溫(wen)失效造成(cheng)事故，變(bian)送器(qi)中還設有斷電(dian)(dian)(dian)(dian)(dian)保護(hu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)。當熱(re)電(dian)(dian)(dian)(dian)(dian)偶(ou)斷絲或(huo)接解不良時，變(bian)送器(qi)會輸出zui大(da)(da)值（28mA）以(yi)使儀表切斷電(dian)(dian)(dian)(dian)(dian)源(yuan)。

一(yi)體化(hua)溫度變送器具有結(jie)構簡(jian)單、節(jie)省引線、輸出信(xin)號大(da)、抗干擾能(neng)力強、線性(xing)好、顯示(shi)儀表簡(jian)單、固(gu)體模塊抗震防潮(chao)、有反(fan)接(jie)保護(hu)和限流保護(hu)、工作可靠(kao)等優(you)點。

一體化溫度變送器的輸出為統一的4～20mA信號；可與微機系(xi)統或(huo)其它(ta)常規儀表匹(pi)配使用。也可用戶(hu)要(yao)求做成防爆型或(huo)防火型測量儀表。