The best alarm contacts for sliding doors are skinny contacts that can properly fit on the door and its frame.
Sliding patio door hook up alarm wire.
This location calls for a recessed contact and magnet.
Both wireless and hardwired sensors can be used for this purpose.
Remove the old sensor.
Sliding glass doors should have wiring at the top if possible to allow making a vent zone later.
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If the sensor is recessed you will need to pull it out from the door frame to access the screw terminals.
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It is also very important to choose a door contact that is compatible with the alarm system that is being used.
The second best location for alarm wiring is at the opening side about 18 above the floor.
Use a screwdriver to disconnect the wires from the old sensor.
Complete the following steps to replace wired door alarm sensors.
Using a surface mount magnetic door switch and will make this easier in most cases.