3500/25?改進的鍵相器是一個半高度，2?通道，用來為3500?框架中的監(jiān)視器提供鍵相位信號。此接收來自電渦流傳感器或電磁式傳感器的輸入信號，并轉換此信號為數(shù)字鍵相位信號，該數(shù)字信號可指示何時轉軸上的鍵相位標記通過鍵相位探頭。每個鍵相有2個輸入通道，3500?機械保護系統(tǒng)可安裝2個鍵相器，接收4個鍵相位信號。
注:??鍵相位信號是來自旋轉軸或齒輪的每轉一次或每轉多次的脈沖信號，提供精確的時間測量。允許3500?監(jiān)測器和外部故障診斷設備用來測量諸如1X?幅值和相位等向量參數(shù)。
每個鍵相器可接收2?個來自渦流傳感器或電磁傳感器的信號。輸入信號范圍為-0.8V到-21.0V(非絕緣I/O?)和+5V到-11V(絕緣I/O?)。內可限幅，使信號不得超過此范圍。無源電磁傳感器要求軸轉速大于200rpm(3.3Hz)。在框架前面板上，通過同軸接頭，有2?個緩沖鍵相位輸出信號。2?個緩沖鍵相位輸出同樣可在框架背面，通過歐式接頭得到。
3500/45?差脹/軸向位置監(jiān)測器是一個可接收趨近式渦流傳感器、旋轉位置傳感器
(RPT)、DC?線性可變微分變換器(DCLVDT)、AC?線性可變微分變換器(AC?LVDT)和旋轉電位計輸入信號的4?通道監(jiān)測器。測量類型和相關的傳感器輸入將決定需要哪種輸入/輸出(I/O)。?它對輸入信號進行處理，并將處理后的信號和用戶可編程的報設置進行比較。應用3500?框架組態(tài)軟件，3500/45?可被編程去完成如下功能：???•??軸向（側向）位置??•??差脹
•??標準單斜面差脹??•??非標準單斜面差脹??•??雙斜面差脹??•??補償式差脹??•??殼脹??•??閥門位置
注:??監(jiān)測器通道成對編程，每次多能完成上述的兩個功能。通道1?和2?能完成一個功能，而通道3?和4?能實現(xiàn)另外一個(或同一個)功能。但是，只有通道3?和4?能實現(xiàn)殼脹監(jiān)測。???3500/45?監(jiān)測器的主要功能是：
1)??通過將所監(jiān)測參數(shù)與設定的報點進行連續(xù)比較并驅動報，以提供機械保護功能??2)??為運行人員和維護人員提供基本的機器信息。
根據(jù)組態(tài)，每一通道可將輸入信號處理為稱作“比例值”的多種參數(shù)。每一個有效比例值可組態(tài)為報設置點，而任意兩個有效比例值可組態(tài)為危險設置點。
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