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解決方案

門磁在安防工程中的典型應用

時間:2016-9-13【打印此頁】 【返回

無線門磁開關的原理  

無線門磁開關一般采用省電設計,當門關閉時它不發射無線電信號,此時耗電只有幾個微安,當門被打開的瞬間,立即發射1秒左右的無線報警信號,然后自行停止,這時就算門一直打開也不會再發射了,這是為了防止發射機連續發射造成內部電池電量耗盡而影響報警,無線門磁還設計有電池低電壓檢測電路,當電池的電壓低于8伏時,下方的發光二極管就會點亮,這時需要立即更換A23報警器專用電池,否則會影響報警的可靠性。  無線門磁傳感器一般安裝在門內側的上方或邊上,它由兩部分組成:較小的部件為永磁體,內部有一塊永久磁鐵,用來產生恒定的磁場,較大的是無線門磁主體,它內部有一個常開型的干簧管,當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,當永磁體離開干簧管一定距離后,無線門磁傳感器立即發射包含地址編碼和自身識別碼(也就是數據碼)的RF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的,然后根據自身識別碼(也就是數據碼),確定是哪一個無線門磁報警。

門磁探測器按傳輸方式分為有線和無線兩種;按其安裝方式分為內嵌和外裝等等,雖然外觀不同,其原理和作用相同。

門磁開關的安裝  

門磁開關探測器安裝在活動的門窗上,首先將門、窗對應位置擦干凈,用雙面膠粘牢;或取下門窗磁力探測器A、B各自的蓋板,用螺絲固定,用螺絲固定,再裝好板。門窗磁力探測器安裝應注意以下幾點:無線門磁探測器A(發射器)和無線門磁探測器B(磁鐵)應分開安裝,即發射器安裝在固定的門框或窗框上,而磁鐵則應安裝在活動的門窗上。

門磁開關的常見故障  

A、無線主機接收不到無線門磁的報警信號  (1)檢查門磁IC編碼是否正確  (2)檢查門磁與主機之間的距離  (3)檢查電池是否有電或電池扣連接是否段落  (4)檢查安裝門磁的周圍環境  (5)檢查門磁的電路板是否損壞  B、門磁的指示燈不亮或長亮不熄  (1)檢查指示燈在電路板上的焊點是否松動、脫落  (2)查電池的電量  (3)檢查電路板是否損壞  C、盡量將發射器裝在門框上,將磁體裝在門上以減少發射器受到震動而引起脫落

門磁開關的應用  

門磁開關廣泛用于測量儀表,辦公室自動化設備,家庭用品,保安及安全設備,運輸設備中。


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