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                                                                                                                                              電磁流量計參數歸零不穩定解決方案

                                                                                                                                              發布時間:2018-7-31 16:12:21訪問次數:

                                                                                                                                               檢查零點電磁流量計不穩定的流程。先按流程全面思索作初步伐查和判別,然后再逐項細致檢查和試掃除毛病。流程所列檢查項目次第的先后準繩是可經察看或訊問理解毋須較大操作的在前,即先易后難按過去現場檢修經歷,呈現頻度較高而今后可能呈現概率較高者在前檢查自身所需的先后請求。若經初步伐查確認是后幾項毛病緣由,亦可提早作細致檢查。 

                                                                                                                                                  管道未充溢液體或液體中含有氣泡客觀上以為流量傳感器內無活動而實踐上存在著微量活動。本類毛病主要緣由是管線的截止閥密閉性差,電磁流量計所檢測到的微小走漏量,誤解為零點變動或零點不穩定。 

                                                                                                                                               閥門運用日久或液體污臟使閥門密閉不全的事例是會經常遇到的,大型閥門特別如此。另一個常用緣由是流量儀表除了主管道中還有若干支管,遺忘或疏忽這些支管的閥門關閉。有時分,在現場確認管系無活動還比擬艱難。此時可按察看能否有走漏量。 

                                                                                                                                               液體電導率變化或不平均,在靜止時會使零點變動,活動時使輸出晃動。因而流量計位置應遠離注入藥液點或管道化學應段下游,流量傳感器最好裝在這些場所的上游。液體若含有固相,或雜質堆積流量計量管內壁,或在電磁流量計量管內壁結垢,或電極被油脂等污穢等等,均有可能呈現零點變動。 


                                                                                                                                               電磁流量計流量傳感器左近的電力設備狀態的變化(如漏電流增加)構成接地電位變化,也會惹起電磁流量計零點變動。管道雜散電流等外界干擾影響主要靠電磁流量計良好的接地維護,通常請求接地電阻小于10,不要和其他電機電器共用接地。有時分環境條件較好,電磁流量計不接地亦能正常工作,但是一旦良好環境不存在,儀表會呈現毛病,屆時再作檢查會帶來諸多費事。


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                                                                                                                                                   檢查流程圖。信號回路絕緣降落會構成零點不穩。信號回路絕緣降落的主要緣由是電極部位絕緣降落所惹起的,但也不能掃除信號電纜及其接線端子絕緣降落或毀壞,由于有時分現場環境非常殘酷,稍一忽略儀表蓋、導線銜接處密封不慎,洋溢著潮氣酸霧或粉粒塵埃侵入儀表接線盒或電纜維護層,使絕緣降落。 

                                                                                                                                                  


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                                                                                                                                                  信號回路絕緣電阻檢查分別按電纜側和流量傳感器兩局部停止,用兆歐表測試。由于信號電纜容易檢測可先做。充溢液體電磁流量計量電極外表接觸電阻和空管后流量計量電極絕緣電阻。

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