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Door Alarms Haverhill MA

Local resource for door alarms in Haverhill. 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.

ADT® Home Security
(888) 564-9618
155 West St
Wilmington, MA
Get a Security System for Just $99! Protect Your Home and Call ADT® Home Security Today.
Phone Hours
MON - FRI 9:00AM - 11:00PM; SAT 9:00AM - 6:00PM; SUN CLOSED

Keane Fire & Safety
(978) 373-3791
2 Red Oak Dr
Plaistow, NH
Eagle Investigation Svc Inc
(978) 682-5559
236 Pleasant St
Methuen, MA
Overfield Security Systems
(785) 843-3434
1915 West 24th Street
Lawrence, MA
Vip Security
(978) 258-1202
225 Broadway
Methuen, MA
Quality Fire Protection Inc
(978) 521-8889
50 Hyatt Ave
Haverhill, MA
Advanced Security Guard Agency
(603) 382-1300
95 Plaistow Rd # 211
Plaistow, NH
S M Investigations & Security
(978) 689-0083
240 Pleasant St
Methuen, MA
Alarms and Protective Devices of New England Inc
(978) 685-3733
7 Broadway
Lawrence, MA
Security Systems Rueschoff
(785) 843-2182
3727 West 6th Street
Lawrence, MA

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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