Door & Window Alarm Sensors Frequently Asked Questions

Are Door and Window Contacts Tamper Proof?
Most door and window contacts have protections put in place to prevent intruders or other people from tampering with them. Find out how door and window contacts are tamper proof.
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What Is the Max Number of Door/Window Sensors I Can Add to a Wireless Alarm System?
Each door and window sensor takes up a zone on a system. If you run out of zones, then you cannot add a new sensor. Find out how many sensors you can add to your system.
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Where Can I Buy Door Contacts for My Alarm System?
Alarm Grid sells all the door contacts you need for your alarm system. We offer hardwired and wireless contacts in surface-mount and recessed varieties. Learn about door contacts.
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Will Any Magnet Work w/ a Door or Window Alarm Sensor?
A magnet's job for a contact sensor is to keep the reed switch closed. In theory, this can be done by any magnet. But it may not be practical. Learn about door and window sensors.
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Do Alarm System Door Contacts Need a Power Supply?
Door contacts operate using a built-in reed switch and magnet. No power supply is needed. But wireless contacts use power to communicate with the panel. Learn about door contacts.
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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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How Does a Door Contact Sensor Work?
The typical door contact consists of a sensor and a magnet. When the door opens, the magnet separates from the sensor. The sensor then alerts the panel. Learn about door 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 I Install a Wireless Door Sensor on a Sliding Patio Door?
On a sliding door, the magnet and sensor should be aligned so that they separate whenever the door is slid opened. Learn how to install a door sensor on a sliding door.
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