Adding A Switch To A Door Sensor

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Question

I have a double window or door; do I need to use two Door/Window Sensors? How can I add an extra magnet switch to a Door/Window Sensor?

Answer

It is pretty simple to add another magnet switch to a Door/Window Sensor. The magnet switch has two screw terminals on it. Normally, one magnet switch is wired to the terminals. Whenever the switch opens up or a wire is cut, the sensor sounds the alarm because power is not flowing between the terminals.

To add a switch to a sensor, unscrew one of the two terminals and take the sensor wire out. Get a length of wire; attach it to the free screw terminal, then attach the other end to a screw terminal on the new magnet switch. Connect the free wire from the sensor module to the other screw terminal on the new magnet switch. You now have a loop of wire with two switches in it. If either switch is tripped, the alarm will go off.

You can call 800-675-3044 to purchase extra magnet switches. You can also substitute any normally-closed sensor (NC) made for a wired security system.

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