Recessed Door/Window Alarm Sensors Frequently Asked Questions

How Do I Remove an Alarm Sensor from a Door or Window?
Many users will want to remove an alarm sensor from a door or window to use it in a new location. This process is fairly easy. Find out how to remove door and window contacts.
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How Do I Install a Recessed Alarm Sensor in a Sliding Glass Door?
Sliding glass doors often use surface-mount contacts. This is because it can be impossible to drill the required holes for recessed contacts. Learn the options for sliding doors.
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Where Do I Install a Sensor Contact on a Door?
The best place to install a contact is on a door frame. The magnet should be installed on the moving part of the door, within a half-inch of the sensor. Learn about door contacts.
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Where Can I Buy Alarm Contacts?
Alarm Grid offers all of the door and window contacts you need for your alarm system. We offer door and window sensors of all types. Learn about our alarm contacts.
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What is a Door Contact Sensor
Alarm systems use door contact sensors to know whether or not doors are opened or closed. This is important for monitoring building activity. Learn about door contacts.
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How Do Plunger Switches Work?
A plunger switch is one way that a recessed door contact can operate. The contact's plunger switch is pressed-in whenever the door is closed. Find out how plunger switches work.
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