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Door Alarms Billings MT

Local resource for door alarms in Billings. 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.

Alert Security & Assets Prtctn
(406) 248-4888
1411 4th Ave N # 9
Billings, MT
 
Dnd Security
(406) 245-9541
2020 Grand Ave
Billings, MT
 
Akal Security Inc
(406) 256-0615
315 S 26th St
Billings, MT
 
Sundown Security
(406) 256-1311
605 Lincoln Ln
Billings, MT
 
Simplex Grinnell
(406) 245-9666
455 Moore Ln # 5
Billings, MT
 
Billings Alarm CO Inc
(406) 245-7219
3318 3rd Avenue North
Billings, MT
 
Gases Plus Norco
(406) 252-5339
899 Parkway Ln
Billings, MT
 
Guardian Security & Invstgtns
(406) 656-8646
PO Box 80633
Billings, MT
 
Securitas Security Svc USA Inc
(406) 245-9824
2070 Overland Ave # 102
Billings, MT
 
Guardsmark Inc
(406) 248-3010
175 N 27th St # 1220
Billings, MT
 

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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