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传统式的报警器封号在防盗器外壳中以维护警报构件，简单化报警器的安裝，报警器机壳通常包含一个固定不动报 警构件的下壳中合隐敝警报构件的顶盖。一个带机壳的报警器的安裝通常包含先安裝报警器下壳到 墙壁，联接报警器构件至报警设备，随后把报警器顶盖安裝到下壳上。
The traditional alarm seal is in the anti-theft device shell to maintain the alarm component and simplify the installation of the alarm. The alarm shell usually contains a lower shell of the fixed alarm component and a top cover of the hidden alarm component. The installation of an alarm with a shell usually includes installing the lower shell of the alarm to the wall, connecting the alarm components to the alarm equipment, and then installing the top cover of the alarm to the lower shell.
报警器通常装在卧室的高空 ，当沒有产生报警时使其不被注意到。这类报警器机壳的缺点取决于(一)报警器封号在机壳中，不方便 于安裝或报警器內部元器件的检修。(二)除此之外，安裝工作人员通常要走上实际操作室内空间比较有限的人字梯顶部安裝报 警器，因此没法与此同时握紧报警器下壳、安裝专用工具、报警器下盖。因此，安裝工作人员一直要多次左右梯 子顺利完成下壳和顶盖的安裝。
The alarm is usually installed high above the bedroom, so that it will not be noticed when there is no alarm. The disadvantages of this kind of alarm casing depend on (I) the seal number of the alarm is in the casing, which is inconvenient for installation or maintenance of internal components of the alarm. （2） In addition, the installation staff usually have to go to the top of the herringbone ladder with limited space in the actual operation room to install the alarm, so they can't hold the lower shell of the alarm, install special tools and the lower cover of the alarm at the same time. Therefore, the installation workers have to successfully complete the installation of the lower shell and top cover on the left and right ladders for many times.