Door Contacts are probably the most common sensor in a residential or commercial security system. Nextec recommends installing door contacts on all exterior main /lower level doors as well as any other exterior accessible via stairs/deck.
Door Contacts consist of transmitter and a magnet. The transmitter is mounted in or on the door frame and the magnet is mounted in or on the door itself. When the door is opened the magnet becomes out of alignment with the transmitter and the circuit is closed (in a normally closed system).
There are different variations of door contacts including:
Recessed door contacts: The transmitter portion of the sensor is mounted into the door frame and the magnet is mounted into the door frame. Recessed installations are generally preferred as they cannot be seen.
Surface Mount Door Contacts: These sensors are mounted to the interior surface of the door and door frame. The transmitter and magnet must be lined up when the door is closed.
Wired Door Contacts: These sensors are connected to the security system
via wiring. They are a good choice for new construction or extensive remodels. Wired Door contacts can be either of the recessed or surface mount type.
Wireless Door Contacts: These sensors are connected to the security system via a wireless radio frequency signal (RF). They require a battery and are available in both recessed and surface mount configurations.
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