A door sensor usually consists of two parts.
Burglar alarm door magnet.
One part contains the magnet while the other part contains the reed switch which is normally closed in the presence of the magnet.
These parts are a sensor and a magnet.
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The magnet goes on the moving portion of the door or window.
When the magnet is separate from the sensor the sensor will send a signal to the panel letting it know that the zone has been opened or faulted.
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A door and window contact sensor consists of two parts.
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Using a random magnet can cause problems.
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Opening the door window will cause the reed to open.
A magnet and reed switching sensor for burglar alarms normally to be recessed into doors or windows and their frames.
We recommend placing the sensor on the door frame and the magnet on the moving portion of the door.
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These parts are the door sensor itself and a magnet.
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The sensor goes on the door or window frame.