ED防爆(bao)應急燈(deng)可分為單(dan)(dan)室差壓丈(zhang)量(liang)和雙室差壓丈(zhang)量(liang)，單(dan)(dan)個(ge)壓力(li)丈(zhang)量(liang)變(bian)送器的(de)膜(mo)(mo)(mo)片(pian)(pian)受(shou)壓后，膜(mo)(mo)(mo)片(pian)(pian)的(de)變(bian)形(xing)導致膜(mo)(mo)(mo)片(pian)(pian)電(dian)阻的(de)改變(bian)，電(dian)阻的(de)改變(bian)由過傾(qing)斜放大單(dan)(dan)元和轉換單(dan)(dan)元輸出，輸出信(xin)(xin)號可與壓力(li)值形(xing)成對應聯系(xi)，假如膜(mo)(mo)(mo)片(pian)(pian)失(shi)效導致變(bian)送器失(shi)效，則整個(ge)反應回路將發生信(xin)(xin)息傳輸過錯。 導致差壓控(kong)制系(xi)(xi)統(tong)癱瘓，變送器長時(shi)刻作(zuo)業(ye)時(shi)，膜片(pian)的(de)(de)彈性模量會發(fa)生改(gai)變，跟著彈性模量的(de)(de)添(tian)加，膜片(pian)的(de)(de)毛病(bing)程度(du)系(xi)(xi)數(shu)越(yue)(yue)小，膜片(pian)的(de)(de)毛病(bing)狀況越(yue)(yue)嚴重，毛病(bing)程度(du)系(xi)(xi)數(shu)越(yue)(yue)大，利(li)用(yong)MATLAB平臺(tai)建立了(le)控(kong)制回路系(xi)(xi)統(tong)的(de)(de)仿真平臺(tai)，變送器正(zheng)常作(zuo)業(ye)時(shi)，輸出(chu)電流與盯梢(shao)信號呈線性聯系(xi)(xi)。

    輸(shu)(shu)出(chu)過(guo)程處于穩定(ding)平衡狀態，假如毛病(bing)程度(du)系(xi)數(shu)發生改變(bian)(bian)，變(bian)(bian)送(song)器(qi)輸(shu)(shu)出(chu)將(jiang)(jiang)跟著電(dian)(dian)流(liu)的添(tian)加(jia)而添(tian)加(jia)，經過(guo)一定(ding)時刻后，變(bian)(bian)送(song)器(qi)輸(shu)(shu)出(chu)將(jiang)(jiang)逐漸減小(xiao)，然后變(bian)(bian)為(wei),過(guo)程目標的值(zhi)(zhi)(zhi)將(jiang)(jiang)增大到一個大值(zhi)(zhi)(zhi)，在生產過(guo)程中(zhong)，工藝操作員(yuan)發現(xian)(xian)(xian)集中(zhong)控制系(xi)統(tong)中(zhong)的壓(ya)力顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)高于現(xian)(xian)(xian)場顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)，儀表(biao)修理(li)人員(yuan)到現(xian)(xian)(xian)場查看發現(xian)(xian)(xian)防爆變(bian)(bian)壓(ya)器(qi)液晶(jing)顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)與壓(ya)力表(biao)顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)共同，現(xian)(xian)(xian)場測驗DCS顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)，顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)也正常，經過(guo)檢(jian)(jian)測儀表(biao)檢(jian)(jian)測，變(bian)(bian)送(song)器(qi)發送(song)的電(dian)(dian)流(liu)值(zhi)(zhi)(zhi)低于實(shi)際輸(shu)(shu)出(chu)電(dian)(dian)流(liu)，判斷毛病(bing)點為(wei)電(dian)(dian)路(lu)板(ban)毛病(bing)，替換電(dian)(dian)路(lu)板(ban)后，集控系(xi)統(tong)顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)與現(xian)(xian)(xian)場顯(xian)現(xian)(xian)(xian)值(zhi)(zhi)(zhi)共同。