在對處于正遷移狀態(tài)差壓變送器使用過程中的測量準確度進行判斷時，將會遇到以下兩種問題：一是儀表輸出錯誤，如果安裝正常的操作順序，應該先對差壓變送器三閥組的正負壓測量時進行關閉，然后進行平衡閥打開和放空儀表堵頭操作，4mA極限值應該遠遠高于儀表輸出值，倘若儀表輸出值大于極限值，那么則說明運行裝置存在堵塞現(xiàn)象，最有可能發(fā)生故障的位置有三閥組和正壓室引線；二是遷移量或者是零位顯示不正常，如果將正壓室取壓點和放空開關依次進行關閉、打開操作后，儀表輸出正常的情況下應該顯示4mA，那么在遷移量或者是零位都較小時，儀表輸出值將會明顯低于4mA，反之，倘若儀表輸出值大于4mA，此時零位或者是遷移量也會隨之升高，此外，隔離液外漏或者是未裝滿會導致正負壓室有隔離液滲入現(xiàn)象的發(fā)生。?繼傳統(tǒng)的接觸器、繼電器等電氣控制系統(tǒng)之后，性能強大、功能豐富的工控裝置PLC（可編程控制器）成為當下電工技術的新寵，用廖常初老師的話講——現(xiàn)在的電工工作人員如果專業(yè)知識架構中，沒有一定的變頻器、PLC等工控裝置的技術儲備，幾乎是無法勝任本職工作的！那么今天我們就來聊一下PLC電源用線方面的相關知識，大家可不要小看這個問題，要知道實際工作中PLC發(fā)生死機、誤動作等故障現(xiàn)象，有近一半的原因正是由于PLC電源質量欠佳所造成的！
①、PLC的供電電源線應取自電壓較穩(wěn)定的干線或單獨引自配電點，以此來確保PLC供電質量。如果電網電壓波動較大（如含有大功率負載），應考慮加裝具有穩(wěn)壓功能的UPS裝置。
②、PLC的電源線最好采用具有一定抗干擾能力的雙絞線，其截面不應低于2mm2（部分歐美機型要求不得低于4mm2）。此外在配線過程中，PLC的I/O、負載等應盡可能單獨的電源線供電，不得從PLC電源輸入線上并接。
③、當電源中噪聲過大時（多由于電網內變頻器等裝置污染所致），對PLC供電應采用隔離變壓器，阻止噪聲干擾進入PLC。
④、在采用隔離變壓器和低通濾波器時，PLC電源線應先經隔離變壓器→低通濾波器后再接入PLC。若所用隔離變壓器采用雙隔離技術時，一次側屏蔽層應接中線，以便隔離進線端的電磁干擾；二次側屏蔽層與PLC系統(tǒng)控制柜要共地連接，同時隔離變壓器二次側輸出線不得接地！
⑤、為防止電網的浪涌過電壓竄入PLC造成其損壞，可在PLC的電源輸入端接入壓敏電阻、浪涌保護器等吸收過電壓元器件，并使所用元器件的接地端和PLC的接地線分開接地。

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