Select the best contacts alarm for doors and windows helps maximize security coverage of all possible points of entry to your home. The contacts consist of triggers that transmit information to a central alarm system. For example, if someone tries to open a window with a contact , the same contact feels the window opening and notifies the alarm that goes off. Several security sources recommend contacts by type of window, as the double-hang.

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Recommended Contacts
Sources Garden State Alarm Company and Cabling Plus, a distributor of electronic security systems, recommends two main types of contacts to double hang windows: recessed or surface. These contacts operate in the same way, either by using magnets. The contact is placed on or in the window frame forms a circuit with the magnet located in the window. When the window is opened, the circuit is broken, the alarm sounding. Fitting contact surface mounted on window frames, while the contacts are mounted in recessed frames, you must drill holes to install them. The contacts recessed only work properly with wooden window frames, because you can easily drill into the wood.


Double windows hang
The double-hang have a special feature that affect the installation of the alarm contacts . Unlike most windows, double hang windows can be opened from both ends. For example, a single hang window containing a single band, which is usually located in the bottom of the window, which slides up and down. The double-hang, moreover, have two sheets, one on top and one at the bottom, both of which are opened. Because of this, double hang windows have more options for potential home invaders, which can open the window in both directions.

The placement of a contact in double hang windows has a greater impact on its effectiveness that the type of contact you use, because the recessed surface and work in much the same way. In a single window hang, just install the contact at the bottom of the window, placing the magnet in the bottom pane of glass. When the window is opened, the circuit is broken. For a double hang window, you must install contacts on the top and bottom of it, since you can open in any direction. Or, you can place a contact with two magnets, one on each sheet in the center of the window.

Partial Magnets
In his book “Security Now: A Guide to Electronic Security,” writes Ed Morawski potential home invaders can outsmart simply contact safety magnets lure. For example, if a thief open your window while holding a magnet to lure even touch , the magnet may confuse contact into thinking that the circuit remains intact. According Morawski, partial magnets represent the best alternative and the optimum option, the contacts and magnets standards. The contacts used in skewed magnets only respond to signals from a special type of magnet, so it is impossible to mistake the alarm system with a second magnet lure.