曾經有剛接觸雷達料位計的用戶，第一次使用時測量過程中出現了一些問題，很不解很疑惑。其實很多剛接觸的用戶或許都有這樣的問題，其實不管是高頻雷達料位計，導波雷達(da)料(liao)位(wei)(wei)計還(huan)是低(di)頻雷達(da)料(liao)位(wei)(wei)計，在測(ce)量(liang)中出(chu)現問(wen)題都是正常現象。用個比(bi)喻(yu)，人都會生病，況且是儀表(biao)呢?出(chu)現問(wen)題，及(ji)時找(zhao)到原(yuan)因并(bing)解(jie)決才是最重要的(de)，今天我們(men)通過一個導波雷達(da)料(liao)位(wei)(wei)計測(ce)量(liang)導電炭黑的(de)案例(li)來一起了解(jie)儀表(biao)測(ce)量(liang)中的(de)問(wen)題和(he)解(jie)決方法。

導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)炭黑(hei)(hei)是具有低電(dian)(dian)阻或高電(dian)(dian)阻性能(neng)的炭黑(hei)(hei)，可賦予制(zhi)品導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)或防靜(jing)電(dian)(dian)作用。其特點為粒徑小，比表面(mian)積大且粗糙(cao)，結構高，表面(mian)潔凈(jing)等(deng)。炭黑(hei)(hei)同(tong)(tong)碳(tan)(tan)黑(hei)(hei)，碳(tan)(tan)黑(hei)(hei)本身(shen)是半導(dao)(dao)(dao)(dao)(dao)體材(cai)(cai)料(liao)，導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)碳(tan)(tan)黑(hei)(hei)具有較低的電(dian)(dian)阻率，能(neng)夠(gou)使橡膠或塑料(liao)具有一(yi)定的導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)性能(neng)，用于不同(tong)(tong)的導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)或抗(kang)靜(jing)電(dian)(dian)制(zhi)品，如(ru)抗(kang)靜(jing)電(dian)(dian)或導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)橡膠、塑料(liao)制(zhi)品、電(dian)(dian)纜料(liao);還可以(yi)做(zuo)干(gan)電(dian)(dian)池的原材(cai)(cai)料(liao)。導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)碳(tan)(tan)黑(hei)(hei)按其導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)性能(neng)和制(zhi)造(zao)方法可分(fen)為：導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)槽黑(hei)(hei)、導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)爐法碳(tan)(tan)黑(hei)(hei)、超導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)爐法碳(tan)(tan)黑(hei)(hei)、特導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)爐法碳(tan)(tan)黑(hei)(hei)等(deng)，乙炔碳(tan)(tan)黑(hei)(hei)也是導(dao)(dao)(dao)(dao)(dao)電(dian)(dian)性能(neng)很好的碳(tan)(tan)黑(hei)(hei)。

某(mou)公司用(yong)戶(hu)需(xu)要(yao)測(ce)(ce)量(liang)(liang)導電(dian)炭黑，經(jing)過了(le)(le)解，現(xian)場環境較好，我(wo)們的工(gong)程(cheng)(cheng)師(shi)(shi)(shi)建議使用(yong)我(wo)司導波(bo)(bo)雷達料位(wei)計(ji)HBRD701，采用(yong)接觸式測(ce)(ce)量(liang)(liang)，對測(ce)(ce)量(liang)(liang)炭黑的穩(wen)定性和精確度(du)(du)具有保障。測(ce)(ce)量(liang)(liang)范圍是(shi)(shi)1.5米(mi)左右，使用(yong)長(chang)時(shi)間后(hou)，客(ke)(ke)戶(hu)反饋出(chu)現(xian)故障無法自行解決(jue)，明(ming)(ming)明(ming)(ming)料倉(cang)沒有料，但儀表顯示卻(que)還有0.5米(mi)多(duo)的料位(wei)高度(du)(du)，于是(shi)(shi)求助我(wo)們。從客(ke)(ke)戶(hu)發回波(bo)(bo)曲線顯示距離值(zhi)可(ke)以(yi)看出(chu)，料位(wei)是(shi)(shi)1.5-0.984=0.516米(mi)，最初我(wo)們的售(shou)后(hou)工(gong)程(cheng)(cheng)師(shi)(shi)(shi)認為現(xian)場師(shi)(shi)(shi)傅安(an)裝(zhuang)調試(shi)出(chu)現(xian)了(le)(le)問題(ti)(ti)，現(xian)場師(shi)(shi)(shi)傅耐心(xin)的按照售(shou)后(hou)工(gong)程(cheng)(cheng)師(shi)(shi)(shi)指(zhi)導的步驟調試(shi)好儀表后(hou)，該問題(ti)(ti)仍(reng)然無法解決(jue)。于是(shi)(shi)又懷疑(yi)是(shi)(shi)料倉(cang)有擋(dang)板，造(zao)成(cheng)虛假回波(bo)(bo)，但是(shi)(shi)料倉(cang)里沒有障礙物，最終這個懷疑(yi)也被排除了(le)(le)。經(jing)過售(shou)后(hou)工(gong)程(cheng)(cheng)師(shi)(shi)(shi)數次的測(ce)(ce)試(shi)分析，發現(xian)是(shi)(shi)下面磁(ci)場太強，導波(bo)(bo)桿(gan)被磁(ci)化了(le)(le)，造(zao)成(cheng)這個問題(ti)(ti)的出(chu)現(xian)，隨后(hou)寄了(le)(le)一(yi)根1.5米(mi)的桿(gan)，安(an)裝(zhuang)好后(hou)，問題(ti)(ti)得到解決(jue)，測(ce)(ce)量(liang)(liang)正常。

通過這(zhe)個案例我們也可(ke)以清楚的發現，導(dao)波桿會被磁場(chang)影響，有這(zhe)方面問(wen)題的用戶可(ke)以參(can)考(kao)。另外專業工(gong)程師在查找問(wen)題時是(shi)(shi)不斷摸索排(pai)除的，任何事情都不是(shi)(shi)一蹴而就的。這(zhe)次測(ce)量(liang)導(dao)電炭黑是(shi)(shi)這(zhe)樣，下次測(ce)量(liang)其(qi)他介質，面對其(qi)他工(gong)況時也是(shi)(shi)這(zhe)樣。