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GFQT 100-22
GFQT 100-22
GFQT 100-22
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〖廈門光沃自動化設(shè)備有限公司 竭誠為您服務(wù)〗
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【品牌】Allen-Bradley羅克韋爾、ABB、本特利Bently 3500系統(tǒng)卡件、GE、艾默生西屋等模塊卡件
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無線門磁傳感器一般安裝在門內(nèi)側(cè)的上方，它由兩部分組成：較小的部件為永磁體，內(nèi)部有一塊永久磁鐵，用來產(chǎn)生恒定的磁場，較大的是無線門磁主體，它內(nèi)部有一個常開型的干簧管，
當(dāng)永磁體和干簧管靠得很近時（小于5毫米），無線門磁傳感器處于工作守候狀態(tài)，當(dāng)永磁體離開干簧管一定距離后，無線門磁傳感器立即發(fā)射包含地址編碼和自身識別碼（也就是數(shù)據(jù)碼）的315MHZ的高頻無線電信號，接收板就是通過識別這個無線電信號的地址碼來判斷是否是同一個報警系統(tǒng)的，然后根據(jù)自身識別碼（也就是數(shù)據(jù)碼），確定是哪一個無線門磁報警。
門磁系統(tǒng)在實際生活當(dāng)中的應(yīng)用
這是市面上常見的一款暗裝式門磁，不帶電線的一端內(nèi)藏磁鐵，帶電線的低端內(nèi)部藏有干簧管等元器件，當(dāng)磁鐵接近時，電線輸出閉合信號，當(dāng)磁鐵遠離時，兩條電線輸出開路信號。不帶電線的一端裝在門的頂部，帶電線的一端裝在門框上。門關(guān)好時，兩端正好重疊接近。市面上還有一些門磁是方形的，適用于明裝場合，用于門窗上。
哪種特性的門磁可用于門禁系統(tǒng)：
門關(guān)閉時輸出閉合信號（用萬用表測量電阻為0），門打開時輸入開路信號。（用萬用表測量電阻無窮大）
市面上90%的門磁是這種特性，還有少量門磁特性正好相反，
或者閉合信號和開路信號都有輸出（三條線，一條是公共，另外兩條配合公共線分別輸出開路和閉合信號，用的時候，選其中一對即可，不合特性的一條閑置）。有些電鎖的門磁也是這樣，例如：5線電插鎖（2條是電源，3條是門磁信號線），8線電插鎖（不但帶門磁輸出，而且?guī)фi頭位置狀態(tài)輸出），把不用的線閑置即可。
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