一(yi)體化熱電(dian)偶(ou)溫度(du)(du)變送(song)器(qi)（以下簡(jian)稱溫度(du)(du)變送(song)器(qi)）由熱電(dian)偶(ou)和信號轉換(huan)器(qi)組成、信號轉換(huan)器(qi)安裝在熱電(dian)偶(ou)傳(chuan)感(gan)(gan)器(qi)的(de)冷端(duan)接線盒(he)內，把(ba)熱電(dian)偶(ou)傳(chuan)感(gan)(gan)器(qi)檢測(ce)到的(de)電(dian)壓信號直接轉換(huan)成4～20mA電(dian)流輸出。結構(gou)簡(jian)單，安裝、使(shi)用(yong)(yong)、維修(xiu)方(fang)便(bian)，是新一(yi)代溫度(du)(du)檢測(ce)、控(kong)制(zhi)儀表，深受廣大(da)設計(ji)人員和用(yong)(yong)戶的(de)歡迎(ying)。目前已(yi)廣泛用(yong)(yong)于(yu)石油、化工(gong)、冶金(jin)、電(dian)站(zhan)、輕工(gong)等部(bu)門，與調節(jie)器(qi)、記(ji)錄儀表、計(ji)算(suan)機(ji)等配套使(shi)用(yong)(yong)，組成各種(zhong)測(ce)量控(kong)制(zhi)系統。

   根據使(shi)用場合(he)的(de)的(de)不(bu)同(tong)分為隔爆型和普通型，根據輸(shu)出(chu)功能的(de)不(bu)同(tong)，分為帶現場顯(xian)示和不(bu)帶現場顯(xian)示。用戶可根據使(shi)用場合(he)和配套儀(yi)表的(de)要求(qiu)選擇適當的(de)規格型號。

隔爆型溫(wen)度變送器(qi)儀器(qi)儀表(biao)防(fang)爆安全監(jian)督檢(jian)驗站測試合格(ge)，可在(zai)爆炸性氣體(ti)環境中使用。

一體化(hua)溫度(du)變送器工(gong)作(zuo)原理

熱(re)電(dian)(dian)偶(ou)或熱(re)電(dian)(dian)阻傳感器(qi)(qi)(qi)(qi)將被測溫度轉(zhuan)換(huan)成電(dian)(dian)信(xin)號(hao)，再將該(gai)信(xin)號(hao)送(song)(song)(song)入變(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)的輸入網(wang)絡(luo)(luo)，該(gai)網(wang)絡(luo)(luo)包含調(diao)零(ling)和熱(re)電(dian)(dian)偶(ou)補償等相(xiang)關電(dian)(dian)路。經調(diao)零(ling)后(hou)的信(xin)號(hao)輸入 到運算放大器(qi)(qi)(qi)(qi)進行信(xin)號(hao)放大，放大的信(xin)號(hao)一(yi)路經V/I轉(zhuan)換(huan)器(qi)(qi)(qi)(qi)計算處理(li)后(hou)以4－20mA直流(liu)電(dian)(dian)流(liu)輸出；另(ling)一(yi)路經A/D轉(zhuan)換(huan)器(qi)(qi)(qi)(qi)處理(li)后(hou)到表頭顯(xian)示(shi)(shi)(shi)。變(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)的線(xian)性化(hua)電(dian)(dian)路有兩種(zhong)，均采用(yong)(yong)反(fan)(fan)饋方(fang)(fang)式(shi)。對熱(re)電(dian)(dian)阻傳感器(qi)(qi)(qi)(qi)，用(yong)(yong)正反(fan)(fan)饋方(fang)(fang)式(shi)校正，對熱(re)電(dian)(dian)偶(ou)傳感器(qi)(qi)(qi)(qi)，用(yong)(yong)多段折線(xian)逼近法進行校正。一(yi)體化(hua)數字顯(xian)示(shi)(shi)(shi)溫度變(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)有兩種(zhong)顯(xian)示(shi)(shi)(shi)方(fang)(fang)式(shi)。LCD顯(xian)示(shi)(shi)(shi)的溫度變(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)用(yong)(yong)兩線(xian)制方(fang)(fang)式(shi)輸出，LED顯(xian)示(shi)(shi)(shi)的溫度變(bian)送(song)(song)(song)器(qi)(qi)(qi)(qi)用(yong)(yong)三線(xian)制方(fang)(fang)式(shi)輸出。

一體化溫度(du)變送器主要(yao)技術參數

1、輸(shu)入信(xin)號(hao)：熱(re)電(dian)偶：K、E、J、B、S、T、N。智(zhi)(zhi)(zhi)能型(xing)(xing)溫度(du)(du)變送器的(de)輸(shu)入信(xin)號(hao)可(ke)通(tong)過手持器和PC機任(ren)意設(she)置； 2、輸(shu)出(chu)信(xin)號(hao)：在(zai)量(liang)程范圍內輸(shu)出(chu)4－20mA直流(liu)信(xin)號(hao)，與熱(re)電(dian)偶或熱(re)電(dian)阻(zu)的(de)輸(shu)入信(xin)號(hao)成(cheng)線性(xing)或與溫度(du)(du)成(cheng)線性(xing)。智(zhi)(zhi)(zhi)能型(xing)(xing)溫度(du)(du)變送器輸(shu)出(chu)4－20mA直流(liu)信(xin)號(hao)同時疊加符合HART標準協議(yi)通(tong)信(xin)；隔離(li)式溫度(du)(du)變送器：輸(shu)入與輸(shu)出(chu)相隔離(li)，隔離(li)電(dian)壓500V，增加了抗共模干擾(rao)能力，更適合與計算機連網使用； 3、基本誤差(cha)：0.5%FS、0.2%FS、智(zhi)(zhi)(zhi)能型(xing)(xing)0.2%FS； 4、接線方式：二線制 5、顯示(shi)方式：四(si)位(wei)LCD顯示(shi)現(xian)場溫度(du)(du)，智(zhi)(zhi)(zhi)能型(xing)(xing)四(si)位(wei)LCD可(ke)通(tong)過PC機或手持器設(she)定(ding)使之顯示(shi)現(xian)場溫度(du)(du)、傳感器值、輸(shu)出(chu)電(dian)流(liu)和百(bai)分比例中的(de)任(ren)一種參數； 6、工(gong)作電(dian)壓：普通(tong)型(xing)(xing)號(hao)12V-35V，智(zhi)(zhi)(zhi)能型(xing)(xing)12V-45V，額定(ding)工(gong)作電(dian)壓為24V 7、允許負(fu)載(zai)電(dian)阻(zu)：500Ω（24VDC供電(dian)）；極限負(fu)載(zai)電(dian)阻(zu)R（max）=50(Vmin-12),例如在(zai)額定(ding)工(gong)作電(dian)壓24V時，負(fu)載(zai)電(dian)阻(zu)可(ke)在(zai)0-600Ω范圍內選(xuan)擇使用。 8、工(gong)作環境：a:環境溫度(du)(du)-25-+80℃（常規型(xing)(xing)） -25-+70℃（數顯型(xing)(xing)） -25-+75℃（智(zhi)(zhi)(zhi)能型(xing)(xing)） b:相對濕(shi)度(du)(du)：5%-95% c:機械振(zhen)(zhen)動f≤50Hz, 振(zhen)(zhen)幅(fu)≤0.15mm d:無腐蝕氣體或類(lei)似的(de)環境； 9、 環境影響系(xi)數：δ≤0.05%/℃。

測(ce)量范圍