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Step 1
Select a point on the window to install the sensors. Ideally, this should be a point about 6 or 7 inches up. It should be high enough to crack the window on warm nights, but not high enough to let anyone crawl in through the opening. With windows that open inward or outward, place the sensors on the top or bottom of the frame close to the side with the window's hinges. It should allow you to safely crack them just as you would with other types of windows.
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Step 2
Screw the trigger into place at your selected point on the window. The trigger should allow you to place it flush against the window, so you can still open and close it normally. (Be sure to use flat-head screws).
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Step 3
Attach the switch to the window frame so that it lines up exactly with the trigger. Secure it in place with screws or drywall nails and make sure that it is flush against the frame like the trigger.
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Step 4
For window sensors connected to a central circuit board, you will need to run wiring from the switch to the control panel. Ideally, your house will be wired internally through the walls. If not, you can simply run wires down the window frame and along the bottom of the wall until you reach the circuit board. Strip the insulation off the ends of the wires and screw them into place on the matching terminals of the switch (the terminals should be labeled to let you know which wire to attach where). Then connect the other end of the wires to their appropriate housings on the control board. Make sure there is no electricity running to the control board when you do so.
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Step 5
For wireless window sensors, fit a battery into the appropriate place on the switch and make sure that it is held securely. The exact type of battery may vary depending upon the specific sensor, but it is usually a common household battery such as a "C" cell or a 9V. Sensors with specialized batteries should have one included in their kit.
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Step 6
Turn on the alarm system and then open and close the window. The alarm should go off as normal.
