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Door Alarms Martinsburg WV

Local resource for door alarms in Martinsburg. 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.

Protective Services Agency
(304) 671-8515
927 Sheridan Ave
Martinsburg, WV
Special Services Bureau Inc
(304) 267-2500
119 W John St
Martinsburg, WV
Wackenhut Security Svc
(304) 264-8500
1300 Pennsylvania Ave
Martinsburg, WV
Alarm monitoring $16.99 per month
(304) 724-1699
5091 Middleway Pike
Kearneysville, WV
Alliance Security Inc
(301) 582-2122
18104 Norman Dr
Fairplay, MD
Fire Safety Equipment Supply
(304) 263-0650
606 W Race St
Martinsburg, WV
Admiral Security Svc
(304) 262-0988
1300 N Queen St
Martinsburg, WV
Certified Alarm Technology
(304) 274-1600
5091 Middleway Pike
Kearneysville, WV
T W & Co Inc
(304) 229-4161
1890 Middleway Pike
Bunker Hill, WV
St James Security Systems
(631) 584-6631
176 2nd St
Saint James, MD

Door Alarms


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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