一體式楔形流(liu)量(liang)計使用過程中相關的專項檢測步(bu)驟
一體(ti)式(shi)楔(xie)(xie)形(xing)流(liu)量(liang)計是一種精密的(de)(de)(de)(de)流(liu)量(liang)測量(liang)儀(yi)表裝置(zhi),其測量(liang)的(de)(de)(de)(de)性(xing)(xing)與(yu)穩(wen)定(ding)性(xing)(xing)不僅與(yu)使(shi)用(yong)初期(qi)的(de)(de)(de)(de)選型密切相(xiang)(xiang)關(guan),還與(yu)后(hou)續使(shi)用(yong)過程(cheng)中(zhong)(zhong)的(de)(de)(de)(de)維(wei)(wei)護(hu)(hu)和保(bao)養有(you)關(guan)系。流(liu)量(liang)計的(de)(de)(de)(de)維(wei)(wei)護(hu)(hu)和保(bao)養工(gong)作(zuo)的(de)(de)(de)(de)進行也有(you)一定(ding)的(de)(de)(de)(de)規范(fan)(fan),相(xiang)(xiang)關(guan)的(de)(de)(de)(de)方法(fa)和技能需(xu)要(yao)(yao)操(cao)作(zuo)人員能夠熟練掌(zhang)握,所謂(wei):工(gong)于行必先利于器“,只(zhi)有(you)掌(zhang)握了(le)規范(fan)(fan)的(de)(de)(de)(de)操(cao)作(zuo)方法(fa),我們在設置(zhi)的(de)(de)(de)(de)使(shi)用(yong)與(yu)維(wei)(wei)護(hu)(hu)中(zhong)(zhong)才能夠得心應手,從而使(shi)儀(yi)表的(de)(de)(de)(de)工(gong)作(zuo)始終(zhong)處于一個穩(wen)定(ding)的(de)(de)(de)(de)狀(zhuang)態,這對于保(bao)持生產(chan)的(de)(de)(de)(de)連續性(xing)(xing)是非常有(you)裨(bi)益的(de)(de)(de)(de)。下(xia)面為朋(peng)友們對于一體(ti)式(shi)楔(xie)(xie)形(xing)流(liu)量(liang)計的(de)(de)(de)(de)使(shi)用(yong)程(cheng)中(zhong)(zhong),對一體(ti)式(shi)楔(xie)(xie)形(xing)流(liu)量(liang)計的(de)(de)(de)(de)維(wei)(wei)護(hu)(hu)保(bao)養需(xu)要(yao)(yao)進行哪(na)些專項檢(jian)測作(zuo)簡(jian)要(yao)(yao)說明:
一體式楔(xie)形(xing)流量計使用(yong)過(guo)程中相關的(de)專(zhuan)項檢測步驟(zou)
、一體(ti)式楔形流量計的電極接(jie)觸(chu)電阻測量
對于(yu)(yu)流(liu)量(liang)(liang)計的(de)測(ce)量(liang)(liang)電(dian)(dian)極的(de)液體(ti)接觸電(dian)(dian)阻(zu)值(zhi),可(ke)以不用卸下流(liu)量(liang)(liang)傳(chuan)感器(qi)而間接估汁電(dian)(dian)極和襯里層表面(mian)(mian)大體(ti)狀況,以此來(lai)幫助分析故障原因。這種方(fang)法非常方(fang)便于(yu)(yu)對大口徑(jing)一體(ti)式楔形流(liu)量(liang)(liang)計的(de)檢(jian)查(cha)。通過對于(yu)(yu)電(dian)(dian)阻(zu)值(zhi)的(de)測(ce)量(liang)(liang),可(ke)以推算出(chu)流(liu)量(liang)(liang)傳(chuan)感器(qi)測(ce)量(liang)(liang)管內表面(mian)(mian)狀況如電(dian)(dian)極和襯里層是否有(you)沉(chen)積(ji)層,沉(chen)積(ji)層足導電(dian)(dian)性質(zhi)的(de)還足絕緣性質(zhi)的(de),電(dian)(dian)極表面(mian)(mian)污染狀況等。
測(ce)出的電(dian)極對地電(dian)阻與(yu)原測(ce)量值比(bi)較有以下不(bu)同趨向:
(1)兩電極(ji)阻不平(ping)衡值增加(即(ji)差(cha)值增加),
(2)電(dian)阻(zu)值增加,
(3)電阻值減少。
這三(san)種(zhong)跡象可分別判斷以下(xia)幾種(zhong)可能故障原因:
(1)電(dian)極部位有(you)一只電(dian)極絕緣有(you)較大下降,
(2)電極表面絕緣(yuan)層覆(fu)蓋,
(3)電極表面(mian)和(he)襯(chen)里表面(mian)附(fu)著導(dao)電沉積層。
以上(shang)幾種故障(zhang)可能性,亦(yi)可作(zuo)為預測產生故障(zhang)的前兆。
用萬(wan)用表(biao)測量時注意(yi)以下各點:
(1)電(dian)阻值(zhi)應在測(ce)(ce)棒接觸端子的瞬間讀取指針偏傳大值(zhi),測(ce)(ce)量值(zhi)應以初一次所得為(wei)準(zhun)。如重新測(ce)(ce)量因極化作用所測(ce)(ce)各值(zhi)足不一致的;
(2)測兩電極(ji)(ji)阻值(zhi)時,接地端(duan)測棒極(ji)(ji)性(xing)必須相(xiang)同(tong),即用電表同(tong)-一根測棒,正極(ji)(ji)棒接電極(ji)(ji),負(fu)極(ji)(ji)棒接地。
(3)測量要用同(tong)一(yi)型號萬用表(biao),并用同(tong)一(yi)量程,常用1.5V電池工作范圍的測量檔,如:×lkn檔。
第二、流量計的電極極化(hua)電壓測(ce)量
電(dian)(dian)(dian)(dian)極(ji)(ji)與(yu)液(ye)體(ti)間極(ji)(ji)化電(dian)(dian)(dian)(dian)壓(ya)(ya)將有助于(yu)判斷零點不(bu)穩或輸出晃動的故障是否(fou)由于(yu)電(dian)(dian)(dian)(dian)極(ji)(ji)被(bei)(bei)污(wu)染(ran)或覆蓋所引起(qi)的。用數字(zi)式(shi)萬用表2V直(zhi)流(liu)檔(dang),分別測(ce)兩電(dian)(dian)(dian)(dian)極(ji)(ji)與(yu)地之間的極(ji)(ji)化電(dian)(dian)(dian)(dian)壓(ya)(ya)(插(cha)入式(shi)楔形(xing)流(liu)量計可以不(bu)停電(dian)(dian)(dian)(dian)測(ce),也(ye)可停電(dian)(dian)(dian)(dian)測(ce))。如果兩次(ci)測(ce)量值(zhi)接近(jin)幾乎(hu)相等,說明電(dian)(dian)(dian)(dian)極(ji)(ji)未被(bei)(bei)污(wu)染(ran)或被(bei)(bei)覆蓋,否(fou)則說明電(dian)(dian)(dian)(dian)極(ji)(ji)被(bei)(bei)污(wu)染(ran)或被(bei)(bei)覆蓋。極(ji)(ji)化電(dian)(dian)(dian)(dian)壓(ya)(ya)大小決定(ding)于(yu)電(dian)(dian)(dian)(dian)極(ji)(ji)材料的"電(dian)(dian)(dian)(dian)極(ji)(ji)電(dian)(dian)(dian)(dian)位"和液(ye)體(ti)的性質,測(ce)量值(zhi)可能在幾mV至幾百mV之間。因(yin)為(wei)實際上運行(xing)中兩電(dian)(dian)(dian)(dian)極(ji)(ji)被(bei)(bei)污(wu)染(ran)情況不(bu)可能*相同對稱(cheng),于(yu)是兩電(dian)(dian)(dian)(dian)極(ji)(ji)上的電(dian)(dian)(dian)(dian)壓(ya)(ya)形(xing)成(cheng)了不(bu)對稱(cheng)的共模(mo)電(dian)(dian)(dian)(dian)壓(ya)(ya)。不(bu)對稱(cheng)的共模(mo)電(dian)(dian)(dian)(dian)壓(ya)(ya)就(jiu)成(cheng)為(wei)差模(mo)信(xin)號,造(zao)成(cheng)零點偏移。
第三(san)、流量計信號(hao)電纜干擾(rao)程度的測(ce)定(ding)
信號(hao)電纜(lan)(lan)受外界靜電感應和(he)電磁(ci)感應干(gan)(gan)擾(rao)會使插(cha)入(ru)式(shi)一體(ti)式(shi)楔形(xing)流(liu)(liu)量計零點變動(dong)。為(wei)判(pan)斷零點變動(dong)是(shi)否由于受信號(hao)電纜(lan)(lan)干(gan)(gan)擾(rao)電勢影(ying)響(xiang),需(xu)測定干(gan)(gan)擾(rao)大體(ti)范圍和(he)對插(cha)入(ru)式(shi)一體(ti)式(shi)楔形(xing)流(liu)(liu)量計的影(ying)響(xiang)程度(du)。
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