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Door Alarms Concord NH

Local resource for door alarms in Concord. Includes detailed information on local businesses that provide access to portable door alarms, burglar alarms, door wedge alarms, door knob alarms, vibration sensors, and home security systems, as well as advice and content on security door stops.

Allied Security
(603) 228-3118
270 Loudon Rd
Concord, NH
 
Zott Electric
(603) 641-5000
127 Westwood Dr
Manchester, NH
 
Amoskeag Fire Equipment
(603) 668-6280
431 Merrimack St
Manchester, NH
 
Merrimack Valley Guard Svc Inc
(603) 647-8330
23 Merrimack St
Manchester, NH
 
Stanley Convergent Scrty Sltns
(603) 695-2101
915 Holt Ave # 7
Manchester, NH
 
Adam Fire Suppression Inc
(603) 529-3175
383 S Sugar Hill Rd
Weare, NH
 
Lrc Svc Inc
(603) 622-7700
728 E Industrial Park Dr # 15
Manchester, NH
 
Securitas Security Svc USA Inc
(603) 627-0333
62 Lowell St
Manchester, NH
 
Acoustic Development Assoc
(603) 669-2720
55 Legacy Dr
Manchester, NH
 
Control Security Svc
(603) 629-0077
1500 S Willow St
Manchester, NH
 

Door Alarms

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Doors can utilize magnetic contact sensors to detect when a door is opened. The sensor mechanism is housed in the switch side of the sensor and a magnet is housed in the other half. Most door alarms utilize a contact switch, which has two metallic parts that must stay in contact when the sensor is armed. In order for a door to be slid or swung open, the mechanism's metallic contacts lose contact with one another. One half of the door sensor is attached to the fixed side of the doorway, and the other is attached to the movable door. When the door is opened the two parts of the mechanism are separated and the alarm signal is sent.

These mechanisms use a strong magnet that can maintain magnetic contact even when the door is opened slightly. This makes it possible to leave a door open to allow airflow between rooms, yet still have all the protection of armed door alarms.

Electromechanical door locks are powerful electrified lock mechanisms which keep them from being opened. They are an important form of security in commercial properties but can also be used in home security systems. These systems often integrate a magnetic contact sensor so if by chance the door should be opened, an alarm would be activated.

Learn more about home security systems .

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