1、概述： SBWR、SBWZ系列熱(re)電(dian)(dian)偶(ou)、熱(re)電(dian)(dian)阻溫(wen)(wen)度(du)(du)(du)變(bian)送器(qi)是DDZ系列儀表中的(de)(de)(de)現場安裝(zhuang)式溫(wen)(wen)度(du)(du)(du)變(bian)送器(qi)單(dan)元，與(yu)(yu)工業熱(re)電(dian)(dian)偶(ou)、熱(re)電(dian)(dian)阻配套使用(yong)(yong)，它(ta)采用(yong)(yong)二線(xian)制傳(chuan)輸(shu)(shu)方式（兩(liang)根導(dao)線(xian)作(zuo)(zuo)為電(dian)(dian)源輸(shu)(shu)入和信號(hao)輸(shu)(shu)出的(de)(de)(de)公用(yong)(yong)傳(chuan)輸(shu)(shu)線(xian)）。將工業熱(re)電(dian)(dian)偶(ou)、熱(re)電(dian)(dian)阻信號(hao)轉(zhuan)換成與(yu)(yu)輸(shu)(shu)入信號(hao)或與(yu)(yu)溫(wen)(wen)度(du)(du)(du)信號(hao)成線(xian)性的(de)(de)(de)4-20mA、0-10mA的(de)(de)(de)輸(shu)(shu)出信號(hao).該溫(wen)(wen)度(du)(du)(du)變(bian)送器(qi)可(ke)直(zhi)接安裝(zhuang)在熱(re)電(dian)(dian)偶(ou)、熱(re)電(dian)(dian)阻的(de)(de)(de)接線(xian)盒(he)內與(yu)(yu)之形成一體化(hua)結構。它(ta)作(zuo)(zuo)為新一代(dai)測(ce)溫(wen)(wen)儀表可(ke)廣泛應(ying)用(yong)(yong)與(yu)(yu)冶金、石(shi)油、化(hua)工、電(dian)(dian)力、輕(qing)工、紡織、食品、國防以及科研等工業部門。

2、主要特點：

  ·采用(yong)硅橡膠或環氧樹脂(zhi)密封(feng)結(jie)構，因此耐(nai)震、耐(nai)濕、適合在惡劣的現(xian)場環境安裝使用(yong)。

  ·現場安(an)裝(zhuang)在(zai)熱(re)電偶、熱(re)電阻的接線(xian)盒內(nei)使用，直接輸出4-20mA、0-10mA的輸出信(xin)號。這樣既節約了昂貴的補償導線(xian)費用，又提高了信(xin)號遠距(ju)離傳輸過程中(zhong)的抗干擾能力；       

  ·熱(re)電偶變送器(qi)具有冷端(duan)溫(wen)度(du)自動補償功能；

  ·精度(du)高、功耗低，使(shi)用環境溫度(du)范(fan)圍(wei)寬，工作(zuo)穩定可(ke)靠(kao)；

  ·適用范圍廣、既可(ke)以與熱電偶(ou)、熱電阻(zu)形(xing)成一體化現場安(an)裝(zhuang)結(jie)構(gou)，也可(ke)以作為功能模塊安(an)裝(zhuang)在檢(jian)測設備中(zhong)和儀表盤(pan)上使用；

  ·智能(neng)型溫度變(bian)送器可(ke)通過HART調制解調器與(yu)上(shang)位機通訊(xun)或(huo)與(yu)手持器和(he)PC機對變(bian)送器的型號、分度號、量程進行遠程信息管理(li)、組(zu)態、變(bian)量監測、校準(zhun)和(he)維護(hu)功能(neng)；

  ·智能型(xing)溫度變(bian)送(song)(song)器(qi)(qi)可按用戶實際需要調整變(bian)送(song)(song)器(qi)(qi)的顯示(shi)方向，并顯示(shi)變(bian)送(song)(song)器(qi)(qi)所測的介質(zhi)溫度、傳感器(qi)(qi)值(zhi)的變(bian)化、輸(shu)出電(dian)流和百(bai)分(fen)比例；

3、工作原理：　

   熱(re)(re)(re)電(dian)(dian)偶(ou)或熱(re)(re)(re)電(dian)(dian)阻傳感(gan)器(qi)(qi)將被測溫度(du)轉(zhuan)換成電(dian)(dian)信(xin)(xin)號(hao)(hao)，再將該信(xin)(xin)號(hao)(hao)送(song)(song)(song)入變(bian)送(song)(song)(song)器(qi)(qi)的輸入網絡，該網絡包含調零(ling)和熱(re)(re)(re)電(dian)(dian)偶(ou)補償等相關電(dian)(dian)路(lu)(lu)。經(jing)調零(ling)后的信(xin)(xin)號(hao)(hao)輸入 到運(yun)算放(fang)(fang)大(da)器(qi)(qi)進行信(xin)(xin)號(hao)(hao)放(fang)(fang)大(da)，放(fang)(fang)大(da)的信(xin)(xin)號(hao)(hao)一路(lu)(lu)經(jing)V/I轉(zhuan)換器(qi)(qi)計(ji)算處(chu)理(li)后以(yi)4－20mA直流電(dian)(dian)流輸出；另一路(lu)(lu)經(jing)A/D轉(zhuan)換器(qi)(qi)處(chu)理(li)后到表頭顯示(shi)。變(bian)送(song)(song)(song)器(qi)(qi)的線(xian)(xian)性化電(dian)(dian)路(lu)(lu)有兩種，均采用(yong)反饋方式(shi)(shi)。對熱(re)(re)(re)電(dian)(dian)阻傳感(gan)器(qi)(qi)，用(yong)正反饋方式(shi)(shi)校正，對熱(re)(re)(re)電(dian)(dian)偶(ou)傳感(gan)器(qi)(qi)，用(yong)多段折線(xian)(xian)逼近(jin)法進行校正。一體化數字顯示(shi)溫度(du)變(bian)送(song)(song)(song)器(qi)(qi)有兩種顯示(shi)方式(shi)(shi)。LCD顯示(shi)的溫度(du)變(bian)送(song)(song)(song)器(qi)(qi)用(yong)兩線(xian)(xian)制方式(shi)(shi)輸出，LED顯示(shi)的溫度(du)變(bian)送(song)(song)(song)器(qi)(qi)三線(xian)(xian)制方式(shi)(shi)輸出。

4、技術(shu)參數

 1、輸入信號(hao)：熱(re)電偶：K、E、J、B、S、T、N。熱(re)電阻：Pt100、Cu50、Cu100（三線制、四線制）。智(zhi)能型溫度變(bian)送器的輸入信號(hao)可(ke)通過手持器和PC機任意設(she)置(zhi)；

 2、輸(shu)出(chu)(chu)信(xin)號(hao)(hao)：在量(liang)程范圍(wei)內(nei)輸(shu)出(chu)(chu)4－20mA直流(liu)信(xin)號(hao)(hao)，與(yu)(yu)熱電(dian)(dian)偶或熱電(dian)(dian)阻的輸(shu)入信(xin)號(hao)(hao)成(cheng)線(xian)(xian)性或與(yu)(yu)溫(wen)度(du)成(cheng)線(xian)(xian)性。智能(neng)型溫(wen)度(du)變送器輸(shu)出(chu)(chu)4－20mA直流(liu)信(xin)號(hao)(hao)同(tong)時疊加符合HART標準協議通信(xin)；隔離式溫(wen)度(du)變送器：輸(shu)入與(yu)(yu)輸(shu)出(chu)(chu)相隔離，隔離電(dian)(dian)壓500V，增加了抗共模(mo)干擾能(neng)力(li)，更適合與(yu)(yu)計算(suan)機(ji)連網使用；

 3、基本誤差：0.5%FS、0.2%FS、智(zhi)能型0.2%FS；

 4、接(jie)線(xian)方式：二線(xian)制、三線(xian)制、四(si)線(xian)制；

 5、顯(xian)示方式：四位(wei)LCD顯(xian)示現場溫度，智能型四位(wei)LCD可通過PC機或手持(chi)

 器(qi)設定使之顯(xian)示現(xian)場溫度(du)、傳感器(qi)值(zhi)、輸出(chu)電(dian)流和百分比例(li)中(zhong)的任一種參(can)數；

 6、工(gong)作(zuo)電壓：普(pu)通型號12V-35V，智能型12V-45V，額(e)定工(gong)作(zuo)電壓為24V

 7、允許負載電(dian)(dian)阻：500Ω（24VDC供電(dian)(dian)）；極限負載電(dian)(dian)阻R（max）=50（Vmin-12）,例如(ru)在(zai)(zai)額定工作電(dian)(dian)壓24V時，負載電(dian)(dian)阻可在(zai)(zai)0-600Ω范圍內選擇使用(yong)。

 8、工作環(huan)境(jing)：a:環(huan)境(jing)溫度-25-+80℃（常(chang)規型）

                        -25-+70℃（數顯(xian)型）

                        -25-+75℃（智(zhi)能(neng)型）

 ;              b:相對濕(shi)度：5%-95%

               c:機械(xie)振動f≤50Hz,振幅(fu)≤0.15mm

               ;d:無腐蝕氣體或類似(si)的環境；

 9、 環(huan)境影響系數：δ≤0.05%/℃。