普通型熱電阻介紹

它的主要特點是測量精(jing)度高，性能穩定。其中(zhong)鉑熱(re)電(dian)阻(zu)(zu)的測量精(jing)確度是最高的，它不(bu)僅(jin)廣泛應用(yong)于工業(ye)測溫，而且被制(zhi)成標準(zhun)的基準(zhun)儀。熱(re)電(dian)阻(zu)(zu)大都由純金(jin)屬材料(liao)(liao)制(zhi)成，應用(yong)最多(duo)的是鉑和(he)(he)銅，此外，已開(kai)始采(cai)用(yong)鎳(nie)、錳和(he)(he)銠等(deng)材料(liao)(liao)制(zhi)造熱(re)電(dian)阻(zu)(zu)。金(jin)屬熱(re)電(dian)阻(zu)(zu)常用(yong)的感溫材料(liao)(liao)種(zhong)類較(jiao)多(duo)，常用(yong)的是鉑絲。

普通型熱電阻介紹

優勢

鎧裝芯子(zi)，*、自動化生產*可溯源和恒久高產品質(zhi)量。確保可靠測量值

Z短響(xiang)應(ying)時間1.5S，實現(xian)優化過程設置

的(de)抗震(zhen)性＞60g，保證提高工廠安全性

無需工具即可簡(jian)便(bian)的進行二次(ci)標(biao)定，節約成本和時間

316L接線盒，操作(zuo)更加簡便，且(qie)安裝維(wei)護(hu)成本(ben)更低，具有(you)Z高防護(hu)等IP69K。

認證，防(fang)爆(bao)保護。

安(an)裝注意(yi)

1、熱電阻應盡量垂(chui)(chui)直裝(zhuang)在水(shui)平(ping)或垂(chui)(chui)直管(guan)道上，安裝(zhuang)時應有保護套管(guan)，以(yi)方便(bian)檢修和更換。

2、測量管道(dao)內溫度(du)時，元件(jian)長度(du)應(ying)在(zai)管道(dao)中心線上(shang)(即保(bao)護管插入深度(du)應(ying)為管徑的(de)一(yi)半)。

3、溫(wen)度動圈表安(an)裝(zhuang)時(shi)，開(kai)孔尺(chi)寸要(yao)合適，安(an)裝(zhuang)要(yao)美觀大方(fang)。

4、高溫區使用耐高溫電纜或(huo)耐高溫補償線。

5、要(yao)根據不同的溫(wen)度選擇(ze)不同的測量元件(jian)。一般測量溫(wen)度小(xiao)于(yu)400℃時選擇(ze)熱電阻。

6、接線要合理美觀，表針指示要正確。

測溫原理

熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)測(ce)(ce)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)原(yuan)(yuan)理與熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)偶的(de)(de)(de)測(ce)(ce)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)原(yuan)(yuan)理不同的(de)(de)(de)是，熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)是基于(yu)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)熱(re)(re)(re)效應(ying)進行溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)測(ce)(ce)量的(de)(de)(de)，即電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)體的(de)(de)(de)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)隨溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)的(de)(de)(de)變(bian)化而變(bian)化的(de)(de)(de)特性。因此，只(zhi)要測(ce)(ce)量出感溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)變(bian)化，就(jiu)可以(yi)測(ce)(ce)量出溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)。目前主(zhu)要有(you)金屬(shu)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)和(he)半導體熱(re)(re)(re)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)兩(liang)類。金屬(shu)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)和(he)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)一般(ban)可以(yi)用(yong)以(yi)下(xia)的(de)(de)(de)近似關系式(shi)表示，即Rt=Rt0[1+α（t-t0）]式(shi)中(zhong)，Rt為(wei)(wei)(wei)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)t時的(de)(de)(de)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)；Rt0為(wei)(wei)(wei)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)t0（通常(chang)t0=0℃）時對應(ying)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)；α為(wei)(wei)(wei)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)系數。半導體熱(re)(re)(re)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)和(he)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)關系為(wei)(wei)(wei)Rt=AeB/t式(shi)中(zhong)Rt為(wei)(wei)(wei)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)為(wei)(wei)(wei)t時的(de)(de)(de)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)；A、B取(qu)決于(yu)半導體材(cai)料的(de)(de)(de)結構(gou)的(de)(de)(de)常(chang)數。相(xiang)比較而言，熱(re)(re)(re)敏電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)的(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)系數更大，常(chang)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)下(xia)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)值(zhi)(zhi)(zhi)(zhi)更高（通常(chang)在(zai)數千歐以(yi)上），但互換性較差，非線(xian)性嚴重，測(ce)(ce)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)范(fan)圍只(zhi)有(you)-50~300℃左右，大量用(yong)于(yu)家(jia)電(dian)(dian)(dian)(dian)(dian)和(he)汽車(che)用(yong)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)檢測(ce)(ce)和(he)控制。金屬(shu)熱(re)(re)(re)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)一般(ban)適用(yong)于(yu)-200~500℃范(fan)圍內的(de)(de)(de)溫(wen)(wen)(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)測(ce)(ce)量，其(qi)(qi)特點是測(ce)(ce)量準確、穩(wen)定性好(hao)、性能可靠，在(zai)程(cheng)控制中(zhong)的(de)(de)(de)應(ying)用(yong)極其(qi)(qi)廣泛。