- 熱電偶和熱電阻溫度計的安裝方法
熱電(dian)(dian)偶和熱電(dian)(dian)阻(zu)溫度計的安裝
熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)溫(wen)(wen)度(du)(du)(du)計是工(gong)礦企(qi)業和(he)(he)(he)科研院所常(chang)用(yong)的(de)(de)(de)(de)溫(wen)(wen)度(du)(du)(du)測(ce)量(liang)儀表。正(zheng)確的(de)(de)(de)(de)安(an)(an)裝(zhuang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)是保(bao)證(zheng)其測(ce)量(liang)精度(du)(du)(du)的(de)(de)(de)(de)重要因(yin)(yin)素(su)。下(xia)面根據平時常(chang)用(yong)的(de)(de)(de)(de)幾種安(an)(an)裝(zhuang)方(fang)式作(zuo)些介紹，希望能給大家的(de)(de)(de)(de)實(shi)際工(gong)作(zuo)提供點參(can)考。首先熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)(de)安(an)(an)裝(zhuang)應(ying)(ying)盡(jin)可能保(bao)持垂直，以(yi)(yi)防(fang)止(zhi)保(bao)護套管(guan)在(zai)(zai)(zai)高溫(wen)(wen)下(xia)產生變形(xing)，但在(zai)(zai)(zai)有流速的(de)(de)(de)(de)情況下(xia)，則必須迎著被測(ce)介質的(de)(de)(de)(de)流向(xiang)插入，以(yi)(yi)保(bao)證(zheng)測(ce)溫(wen)(wen)元件與流體的(de)(de)(de)(de)充(chong)分接觸以(yi)(yi)保(bao)證(zheng)其測(ce)量(liang)精度(du)(du)(du)。另外熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)應(ying)(ying)盡(jin)量(liang)安(an)(an)裝(zhuang)在(zai)(zai)(zai)有保(bao)護層的(de)(de)(de)(de)管(guan)道內，以(yi)(yi)防(fang)止(zhi)熱(re)(re)(re)(re)量(liang)散失。其次當(dang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)安(an)(an)裝(zhuang)在(zai)(zai)(zai)負(fu)壓管(guan)道中時，必須保(bao)證(zheng)測(ce)量(liang)處的(de)(de)(de)(de)密封(feng)性(xing)，以(yi)(yi)防(fang)止(zhi)外界冷空氣進入，使讀數(shu)偏低。當(dang)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)安(an)(an)裝(zhuang)在(zai)(zai)(zai)戶外時，熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)(de)接線(xian)(xian)(xian)盒面蓋應(ying)(ying)向(xiang)上，入線(xian)(xian)(xian)口應(ying)(ying)向(xiang)下(xia)，以(yi)(yi)避(bi)免雨(yu)水或灰塵(chen)進入接線(xian)(xian)(xian)盒，而損(sun)壞(huai)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)接線(xian)(xian)(xian)盒內的(de)(de)(de)(de)接線(xian)(xian)(xian)影(ying)響其測(ce)量(liang)精度(du)(du)(du)。應(ying)(ying)經常(chang)檢查(cha)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)和(he)(he)(he)熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)阻(zu)溫(wen)(wen)度(du)(du)(du)計各處的(de)(de)(de)(de)接線(xian)(xian)(xian)情況，特別是熱(re)(re)(re)(re)電(dian)(dian)(dian)(dian)偶(ou)(ou)溫(wen)(wen)度(du)(du)(du)計由于(yu)其補償導線(xian)(xian)(xian)的(de)(de)(de)(de)材料硬度(du)(du)(du)較高，非常(chang)容(rong)易和(he)(he)(he)接線(xian)(xian)(xian)柱脫離造成(cheng)斷路(lu)故障，因(yin)(yin)此要接線(xian)(xian)(xian)良(liang)好不要過多碰動(dong)溫(wen)(wen)度(du)(du)(du)計的(de)(de)(de)(de)接線(xian)(xian)(xian)并經常(chang)檢查(cha)，以(yi)(yi)獲(huo)得正(zheng)確的(de)(de)(de)(de)測(ce)量(liang)溫(wen)(wen)度(du)(du)(du)。
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