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- When a door is opened, the magnet will pull away and separate from the sensor, causing a reed switch inside the sensor to activate12. This will send a signal to the security system, letting it know that the door was opened1. Most door alarms use a type of contact sensor that relies on a reed switch and a magnet2. When the door is closed, the magnet keeps the reed switch circuit closed. When the door is opened and the magnet is removed, the circuit opens, triggering an alarm or an alert2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.Opening the door will cause the magnet to pull away and separate from the sensor. When this happens, a reed switch inside the sensor will activate. This will cause the sensor to send a signal to the security system, letting it know that the door was opened.www.alarmgrid.com/blog/everything-youve-ever-wa…Most door alarms use a type of contact sensor that relies on what’s called a reed switch and a magnet. When the door is closed, the magnet keeps that reed switch circuit closed. When the door is opened and the magnet is removed, the circuit opens, triggering an alarm or an alert.www.safehome.org/motion-sensors/door/
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