電磁流量計測量(liang)(liang)原理是(shi)法(fa)拉第電(dian)(dian)(dian)(dian)(dian)磁感應(ying)(ying)定律，根據導電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)體(ti)通(tong)過(guo)外(wai)加(jia)磁場時感生的(de)電(dian)(dian)(dian)(dian)(dian)動勢來測量(liang)(liang)導電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)體(ti)流(liu)(liu)量(liang)(liang)的(de)一種儀(yi)器，傳感器主要組成部分是(shi)：測量(liang)(liang)管(guan)、電(dian)(dian)(dian)(dian)(dian)極、勵磁線(xian)圈、鐵芯與磁軛殼體(ti)。產品(pin)主要用(yong)(yong)于測量(liang)(liang)封閉管(guan)道中(zhong)的(de)導電(dian)(dian)(dian)(dian)(dian)液體(ti)和漿液中(zhong)的(de)體(ti)積流(liu)(liu)量(liang)(liang)，包(bao)括酸、堿、鹽等(deng)強腐蝕性(xing)的(de)液體(ti)。JD-LD電(dian)(dian)(dian)(dian)(dian)磁流(liu)(liu)量(liang)(liang)計廣泛應(ying)(ying)用(yong)(yong)于石油(you)、化工(gong)、冶金、紡織、食品(pin)、制(zhi)藥、造紙等(deng)行業以(yi)及環保、市政管(guan)理，水利建設等(deng)領(ling)域。
    電磁流量計運(yun)行故障(zhang)：
    1、內(nei)壁附著層
    由于流(liu)(liu)量計測量含有懸(xuan)浮固相(xiang)或污臟體的機會(hui)遠比其他流(liu)(liu)量儀(yi)(yi)表(biao)多，出現內壁附著層產(chan)生(sheng)的故障概率(lv)(lv)也(ye)就相(xiang)對較高。若附著層電(dian)導率(lv)(lv)與液體電(dian)導率(lv)(lv)相(xiang)近，儀(yi)(yi)表(biao)還能正(zheng)常(chang)輸(shu)出信號(hao)，只是改變流(liu)(liu)通面積，形成測量誤差的隱性(xing)故障；若是高電(dian)導率(lv)(lv)附著層，電(dian)極(ji)間電(dian)動勢將被短路(lu)(lu)；若是絕緣(yuan)性(xing)附著層，電(dian)極(ji)表(biao)面被絕緣(yuan)而斷開測量電(dian)路(lu)(lu)。后兩種現象均會(hui)使儀(yi)(yi)表(biao)無(wu)法工作。
    2、雷(lei)電擊(ji)
    雷(lei)(lei)電(dian)(dian)(dian)擊(ji)在線(xian)(xian)路(lu)中感應瞬時(shi)高電(dian)(dian)(dian)壓(ya)和(he)(he)浪(lang)涌電(dian)(dian)(dian)流(liu)，進入儀(yi)表(biao)就會(hui)損壞儀(yi)表(biao)。雷(lei)(lei)電(dian)(dian)(dian)擊(ji)損儀(yi)表(biao)有3條(tiao)引入途(tu)徑(jing)：電(dian)(dian)(dian)源線(xian)(xian)，傳(chuan)感器勺轉(zhuan)換器間的(de)流(liu)量信號線(xian)(xian)和(he)(he)激磁(ci)線(xian)(xian)。然而從(cong)雷(lei)(lei)電(dian)(dian)(dian)故(gu)障(zhang)(zhang)中損壞零部件的(de)分析，引起(qi)故(gu)障(zhang)(zhang)的(de)感應高電(dian)(dian)(dian)壓(ya)和(he)(he)浪(lang)涌電(dian)(dian)(dian)流(liu)大部分足從(cong)控制室電(dian)(dian)(dian)源線(xian)(xian)路(lu)引入的(de)，其(qi)他兩條(tiao)途(tu)徑(jing)較(jiao)少。還從(cong)發生(sheng)雷(lei)(lei)擊(ji)事故(gu)現(xian)場了解到，不僅電(dian)(dian)(dian)磁(ci)流(liu)量計出現(xian)故(gu)障(zhang)(zhang)，控制室中其(qi)他儀(yi)表(biao)電(dian)(dian)(dian)常(chang)常(chang)同時(shi)出現(xian)雷(lei)(lei)擊(ji)事故(gu)。因(yin)此使用單位要(yao)認(ren)識(shi)設(she)置控制室儀(yi)表(biao)電(dian)(dian)(dian)源線(xian)(xian)防雷(lei)(lei)設(she)施(shi)的(de)重要(yao)性。
    3、環(huan)境條件變化(hua)
    主要原因同上節(jie)調(diao)試(shi)(shi)期故障環境(jing)方(fang)面，只(zhi)是干擾(rao)(rao)源(yuan)不(bu)在調(diao)試(shi)(shi)期出(chu)(chu)現(xian)而在運(yun)行(xing)期間再介入的。例如(ru)一臺接地保護(hu)并(bing)不(bu)理想(xiang)的電磁流量(liang)計，調(diao)試(shi)(shi)期因無(wu)干擾(rao)(rao)源(yuan)，儀表運(yun)行(xing)正(zheng)常，然而在運(yun)行(xing)期出(chu)(chu)現(xian)新干擾(rao)(rao)源(yuan)（例如(ru)測量(liang)點附近管道或較遠(yuan)處(chu)實施(shi)管道電焊(han)）干擾(rao)(rao)儀表正(zheng)常運(yun)行(xing)，出(chu)(chu)現(xian)輸出(chu)(chu)信號大(da)幅度波動。