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Electromagnetic Alarms Salem NH

Local resource for Electromagnetic Alarms in Salem. Includes detailed information on local businesses that provide access to Electromagnetic Alarms, keyless entry, garage door opener, driveway alarm, as well as advice and content on electromagnetic and electronic alarm system retailers and stores in your location.

Ultravision Security Systems Inc
(603) 898-1840
88 Stiles Rd
Salem, NH
Control Security Service
(603) 893-2376
1 Mill Rd
Derry, NH
Security Camera Systems New England
(603) 216-6028
20 North Wentworth Ave
Londonderry, NH
Alternate Phone Number
Security Camera Solutions and Installation

Property Protection Monitoring
(978) 596-1600
176 Walker St
Lowell, MA
Madison Security Group
(978) 453-7602
31 Kirk St
Lowell, MA
East Coast Security Services Inc
(603) 898-6823
68 Stiles Rd Ste C
Salem, NH
Safeguard Solutions
(603) 421-0100
6 W Broadway
Derry, NH
Allied Security Incorporated
(978) 452-4606
130 John St
Lowell, MA
National Security Protective Services Incorporated
(401) 831-6072
131 E Merrimack St
Lowell, MA
Apex Information Security
(978) 375-2526
100 Phoenix Ave Ste 3
Lowell, MA

Electromagnetic Detection

Most intrusion detection systems in use today utilize some form of electrical circuit running through wires, mechanisms, metalized tape or foil. If any part of the electric circuit running through two pieces of metal in the door locks or window lock mechanisms , or if a strip of metallic tape on the window glass is broken, it trips an alarm.

Circuits work well when an intruder attempts entry as one would expect, by opening a door or window. Burglars however, know how to use crowbars and other burglary tools to get through doors without disrupting these electrical circuits. In warm climate regions, houses may have thin walls, and entry can be gained by cutting through a wall. Tape or wire mesh in the wall would have to be torn or cut through to gain entry, thus tripping the security alarms .

Limitations occur in a circuit system because the gap or break can be bridged when the burglar breaks the tape or magnetic connection with a long wire or piece of metalized tape, prying open a door or window frame without setting off the alarm.

Magnetic Contact Circuits

Electromagnetic systems are often used on doors to apartment buildings and secure areas in government offices. They use a magnet in one sealed enclosure and a switch in another sealed enclosure and when the magnetic contact is broken, the alarm signal sounds.

In order to open a door protected with a magnetic door latch, a button has to be pushed by an attendant to allow the door to be opened by the visitor...

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