一、鎧裝熱電偶與普通熱電偶的區別在哪
鎧(kai)裝熱(re)電偶與普通(tong)熱(re)電偶最大(da)的區別就是結構的不同。
1、鎧裝熱電偶:由金屬(shu)維護管(guan)、絕緣資料和電(dian)阻體三者(zhe)組(zu)合經冷拔、旋(xuan)銀加工而成(cheng)。鎧裝型熱(re)電(dian)偶中(zhong)(zhong)的電(dian)阻體是(shi)用(yong)細(xi)鉑絲燒(shao)在(zai)鉑銠(lao)熱(re)電(dian)偶陶瓷(ci)或玻璃(li)支架(jia)上制成(cheng),引線普(pu)通為鋼導(dao)線或銀導(dao)線,鎧裝熱(re)電(dian)偶可以做得很(hen)(hen)細(xi)很(hen)(hen)長(chang),在(zai)使(shi)用(yong)中(zhong)(zhong)可以隨(sui)測(ce)量需(xu)要進行彎曲。
2、普通型熱電偶:一(yi)般由熱電(dian)極,絕緣管,保(bao)護(hu)套管和接線盒(he)等部分組成(cheng)(cheng),而鎧(kai)裝型熱電(dian)偶則是將熱電(dian)偶絲,絕緣材料和金屬保(bao)護(hu)套管三者組合裝配后,經過拉伸加工(gong)而成(cheng)(cheng)的(de)一(yi)種堅實的(de)組合體。
二、鎧裝熱電偶有什么特點
鎧(kai)裝熱(re)電(dian)偶(ou)是(shi)溫(wen)度(du)(du)測量(liang)中(zhong)應(ying)(ying)用最(zui)廣泛(fan)的(de)溫(wen)度(du)(du)器(qi)件,他的(de)主要特(te)點就是(shi)測溫(wen)范圍(wei)寬,性能(neng)比較穩定,同(tong)時結構簡單(dan),動態響應(ying)(ying)好(hao),更能(neng)夠遠(yuan)傳4-20mA電(dian)信(xin)號,便于自動控制(zhi)和(he)集中(zhong)控制(zhi)。另外,熱(re)響應(ying)(ying)時間少,減(jian)少動態誤差;可彎曲安(an)裝使用;測量(liang)范圍(wei)大;機(ji)械強度(du)(du)高,耐壓性能(neng)好(hao)都是(shi)鎧(kai)裝熱(re)電(dian)偶(ou)的(de)優勢。
三、鎧裝熱電偶的工作原理是什么
鎧裝熱(re)電(dian)(dian)(dian)(dian)偶(ou)的(de)工(gong)作原理是,兩種不同成份(fen)的(de)導體兩端(duan)(duan)(duan)(duan)(duan)經(jing)焊接(jie),形成回路,直(zhi)接(jie)測(ce)溫端(duan)(duan)(duan)(duan)(duan)叫工(gong)作端(duan)(duan)(duan)(duan)(duan),接(jie)線端(duan)(duan)(duan)(duan)(duan)子端(duan)(duan)(duan)(duan)(duan)叫冷端(duan)(duan)(duan)(duan)(duan),也稱參比(bi)端(duan)(duan)(duan)(duan)(duan)。當工(gong)作端(duan)(duan)(duan)(duan)(duan)和(he)參比(bi)端(duan)(duan)(duan)(duan)(duan)存在溫差時(shi),就(jiu)會在回路中產(chan)生(sheng)熱(re)電(dian)(dian)(dian)(dian)流,接(jie)上顯示儀(yi)表(biao),儀(yi)表(biao)上就(jiu)會指示出熱(re)電(dian)(dian)(dian)(dian)偶(ou)所(suo)產(chan)生(sheng)的(de)熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)對應溫度值。熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)將隨著(zhu)測(ce)量端(duan)(duan)(duan)(duan)(duan)溫度升(sheng)高而增長(chang)(chang),熱(re)電(dian)(dian)(dian)(dian)動(dong)勢(shi)的(de)大(da)小只和(he)熱(re)電(dian)(dian)(dian)(dian)偶(ou)導體材(cai)質以(yi)及兩端(duan)(duan)(duan)(duan)(duan)溫差有關,和(he)熱(re)電(dian)(dian)(dian)(dian)極的(de)長(chang)(chang)度、直(zhi)徑無關。