A-B 1606-XLS240E寫入標(biāo)簽 6-38電磁流量計(jì)使用中常遇到的故障類般為儀表本身的故障即儀表結(jié)構(gòu)件或元器件損壞引起的故障；二類則是由外原因引起造成的。如安裝不妥流動(dòng)畸變沉積和結(jié)垢等。這里重點(diǎn)討論的是應(yīng)用方面和上述二類外原因的故障。
按照故障發(fā)生時(shí)期分類可分為：①運(yùn)行期故障；②調(diào)試期故障。調(diào)試期故障出現(xiàn)在新裝用后調(diào)試初期主要原因是儀表選用或設(shè)定不當(dāng)安裝不妥等。運(yùn)行期故障足在運(yùn)行段時(shí)期后出現(xiàn)主要原因有流體中雜質(zhì)附著電襯里環(huán)境條件變化出現(xiàn)新干擾源等。
按故障外源頭分析來自3個(gè)方面：①管道系統(tǒng)和安裝等方面引起的；②環(huán)境方面引起的；③流體方面引起的。來源①主要在調(diào)試期表現(xiàn)出來；來源②和③則在調(diào)試期和運(yùn)行期均會(huì)出現(xiàn)。
、運(yùn)行期故障
經(jīng)初期調(diào)試并正常運(yùn)行段時(shí)期后在運(yùn)行期間出現(xiàn)的故障常見故障原因有：流量傳感器內(nèi)壁附著層雷電擊環(huán)境條件變化。
、內(nèi)壁附著層
由于電磁流量計(jì)測量含有懸浮固相或污臟體的機(jī)會(huì)遠(yuǎn)比其他流量儀表多出現(xiàn)內(nèi)壁附著層產(chǎn)生的故障概率也就相較高。若附著層電導(dǎo)率與液體電導(dǎo)率相近儀表還能正常輸出信號(hào)只是改變流通面積形成測量誤差的隱性故障；若是高電導(dǎo)率附著層電間電動(dòng)勢(shì)將被短路；若是緣性附著層電表面被緣而斷開測量電路。后兩種現(xiàn)象均會(huì)使儀表無法工作。
2、雷電擊
雷電擊在線路中感應(yīng)瞬時(shí)高電壓和浪涌電流進(jìn)入儀表就會(huì)損壞儀表。雷電擊損儀表有3條引入途徑：電源線傳感器勺轉(zhuǎn)換器間的流量信號(hào)線和激磁線。然而從雷電故障中損壞零部件的分析引起故障的感應(yīng)高電壓和浪涌電流大部分足從控制室電源線路引入的其他兩條途徑較少。還從發(fā)生雷擊事故現(xiàn)場了解到不僅電磁流量計(jì)出現(xiàn)故障，插入式電磁流量計(jì)生產(chǎn)廠控制室中其他儀表電常常同時(shí)出現(xiàn)雷擊事故。因此使用單位要認(rèn)識(shí)設(shè)置控制室儀表電源線防雷設(shè)施的重要性�，F(xiàn)任已有若于設(shè)計(jì)單位識(shí)和探索解決這問題。
廈門興銳達(dá)自動(dòng)化設(shè)備有限公司 

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