一、鎧裝熱電偶與普通熱電偶的區別在哪
鎧裝熱(re)電(dian)偶與普通熱(re)電(dian)偶最大的區(qu)別就(jiu)是結構的不同。
1、鎧裝熱電偶:由金屬維護管、絕緣(yuan)資料和電(dian)(dian)阻(zu)(zu)體(ti)三者組合(he)經冷拔、旋銀加工而成(cheng)。鎧裝(zhuang)(zhuang)型熱(re)電(dian)(dian)偶(ou)中(zhong)(zhong)的電(dian)(dian)阻(zu)(zu)體(ti)是(shi)用(yong)細鉑(bo)絲燒在鉑(bo)銠(lao)熱(re)電(dian)(dian)偶(ou)陶(tao)瓷或玻(bo)璃支架(jia)上(shang)制成(cheng),引線普通(tong)為鋼導線或銀導線,鎧裝(zhuang)(zhuang)熱(re)電(dian)(dian)偶(ou)可以做得很細很長,在使用(yong)中(zhong)(zhong)可以隨測量需(xu)要(yao)進行彎(wan)曲。
2、普通型熱電偶:一般(ban)由熱電(dian)(dian)極,絕(jue)緣管(guan),保護套管(guan)和接線盒等(deng)部分組成,而(er)鎧裝(zhuang)型熱電(dian)(dian)偶則(ze)是將熱電(dian)(dian)偶絲,絕(jue)緣材料和金屬(shu)保護套管(guan)三(san)者(zhe)組合(he)裝(zhuang)配后,經過拉伸加工而(er)成的一種堅實的組合(he)體。
二、鎧裝熱電偶有什么特點
鎧(kai)裝熱(re)電(dian)偶是溫度(du)測(ce)量(liang)中應(ying)用最廣泛的(de)溫度(du)器件,他的(de)主要特點就是測(ce)溫范圍(wei)寬,性(xing)(xing)能比較穩(wen)定,同時結構簡單,動態響(xiang)應(ying)好,更(geng)能夠(gou)遠(yuan)傳4-20mA電(dian)信號,便于(yu)自動控(kong)制和集中控(kong)制。另外,熱(re)響(xiang)應(ying)時間少(shao),減少(shao)動態誤差(cha);可彎曲安裝使用;測(ce)量(liang)范圍(wei)大;機械強(qiang)度(du)高,耐壓性(xing)(xing)能好都是鎧(kai)裝熱(re)電(dian)偶的(de)優(you)勢。
三、鎧裝熱電偶的工作原理是什么
鎧裝熱(re)(re)電(dian)(dian)(dian)偶(ou)的工(gong)作(zuo)原理是(shi),兩(liang)(liang)種不(bu)同成份(fen)的導(dao)體(ti)(ti)兩(liang)(liang)端(duan)(duan)(duan)(duan)經焊接(jie),形成回路(lu),直(zhi)接(jie)測溫端(duan)(duan)(duan)(duan)叫工(gong)作(zuo)端(duan)(duan)(duan)(duan),接(jie)線端(duan)(duan)(duan)(duan)子(zi)端(duan)(duan)(duan)(duan)叫冷端(duan)(duan)(duan)(duan),也稱(cheng)參(can)比端(duan)(duan)(duan)(duan)。當工(gong)作(zuo)端(duan)(duan)(duan)(duan)和(he)參(can)比端(duan)(duan)(duan)(duan)存在溫差時,就會在回路(lu)中產(chan)生(sheng)熱(re)(re)電(dian)(dian)(dian)流,接(jie)上(shang)顯示(shi)儀表,儀表上(shang)就會指示(shi)出熱(re)(re)電(dian)(dian)(dian)偶(ou)所產(chan)生(sheng)的熱(re)(re)電(dian)(dian)(dian)動(dong)勢(shi)的對應溫度(du)(du)值。熱(re)(re)電(dian)(dian)(dian)動(dong)勢(shi)將隨著(zhu)測量端(duan)(duan)(duan)(duan)溫度(du)(du)升高而增長(chang),熱(re)(re)電(dian)(dian)(dian)動(dong)勢(shi)的大(da)小只(zhi)和(he)熱(re)(re)電(dian)(dian)(dian)偶(ou)導(dao)體(ti)(ti)材質以(yi)及兩(liang)(liang)端(duan)(duan)(duan)(duan)溫差有關,和(he)熱(re)(re)電(dian)(dian)(dian)極的長(chang)度(du)(du)、直(zhi)徑無關。