現場儀器儀表故障排除檢測方法解析

多欽儀表（上海）有限公司專注於流量計與服務   技術之窗 

    liuliangkongzhiyibiaoxitongzhishizhidadaozuixiaoshi，shouxianjianzhaxianchangjianceyibiao，ruguozhengchang
，zeguzhangzaixianshiyibiao。dangxianchangjianceyibiaozhishiyezuixiao，zejianzhatiaojiefakaidu，ruotiaojiefakaiduweiling
，zechangweitiaojiefadaotiaojieqizhijianguzhang。dangxianchangjianceyibiaozhishizuixiao，tiaojiefakaiduzhengchang，guzhangyuanyinhenkenengshixitongyalibugou、係統管路堵塞、泵不上量
、介質結晶、操作不當等原因造成。若是儀表方麵的故障，原因有：孔板差壓流量計可能是正壓引壓導管堵
；差壓變送器正壓室漏；機械式流量計是齒輪卡死或過濾網堵等。  

 分析溫度控製儀表係統故障時，首先：該係統儀表多采用電動儀表測量
、指示、控製
；gaixitongyibiaodeceliangwangwangzhihoujiaoda。wenduyibiaoxitongdezhishizhituranbiandaozuidahuozuixiao，yibanweiyibiaoxitongguzhang。yinweiwenduyibiaoxitongceliangzhihoujiaoda
，buhuifashengturanbianhua。cishideguzhangyuanyinduoshiredianou

、熱電阻
、補償導線斷線或變送器放大器失靈造成。溫度控製儀表係統指示出現快速振蕩現象，多為控製參數PID調(tiao)整(zheng)不(bu)當(dang)造(zao)成(cheng)。溫(wen)度(du)控(kong)製(zhi)儀(yi)表(biao)係(xi)統(tong)指(zhi)示(shi)出(chu)現(xian)大(da)幅(fu)緩(huan)慢(man)的(de)波(bo)動(dong)，很(hen)可(ke)能(neng)是(shi)由(you)於(yu)工(gong)藝(yi)操(cao)作(zuo)變(bian)化(hua)引(yin)起(qi)的(de)，如(ru)當(dang)時(shi)工(gong)藝(yi)操(cao)作(zuo)沒(mei)有(you)變(bian)化(hua)，則(ze)很(hen)可(ke)能(neng)是(shi)儀(yi)表(biao)控(kong)製(zhi)係(xi)統(tong)本(ben)身(shen)的(de)故(gu)障(zhang)。溫(wen)度(du)控(kong)製(zhi)係(xi)統(tong)本(ben)身(shen)的(de)故(gu)障(zhang)分(fen)析(xi)步(bu)驟(zhou)：檢查調節閥輸入信號是否變化，輸入信號不變化，調節閥動作，調節閥膜頭膜片漏了
；檢查調節閥定位器輸入信號是否變化，輸入信號不變化
，輸出信號變化，定位器有故障；檢查定位器輸入信號有變化
，再查調節器輸出有無變化
，如果調節器輸入不變化，輸出變化，此時是調節器本身的故障。

      壓力控製係統儀表指示出現快速振蕩波動時，首先檢查工藝操作有無變化，這種變化多半是工藝操作和調節器PID參(can)數(shu)整(zheng)定(ding)不(bu)好(hao)造(zao)成(cheng)。壓(ya)力(li)控(kong)製(zhi)係(xi)統(tong)儀(yi)表(biao)指(zhi)示(shi)出(chu)現(xian)死(si)線(xian)
，工(gong)藝(yi)操(cao)作(zuo)變(bian)化(hua)了(le)壓(ya)力(li)指(zhi)示(shi)還(hai)是(shi)不(bu)變(bian)化(hua)，一(yi)般(ban)故(gu)障(zhang)出(chu)現(xian)在(zai)壓(ya)力(li)測(ce)量(liang)係(xi)統(tong)中(zhong)，首(shou)先(xian)檢(jian)查(zha)測(ce)量(liang)引(yin)壓(ya)導(dao)管(guan)係(xi)統(tong)是(shi)否(fou)有(you)堵(du)的(de)現(xian)象(xiang)
，不(bu)堵(du)
，檢(jian)查(zha)壓(ya)力(li)變(bian)送(song)器(qi)輸(shu)出(chu)係(xi)統(tong)有(you)無(wu)變(bian)化(hua)，有(you)變(bian)化(hua)，故(gu)障(zhang)出(chu)在(zai)控(kong)製(zhi)器(qi)測(ce)量(liang)指(zhi)示(shi)係(xi)統(tong)。