Balanced Magnetic Switches in Software

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Balanced Magnetic Switches
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Balanced magnetic switches contain two parts like the magnetic switches however one magnet is mounted on the door or window frame and a balancing magnet is mounted on the door or window The magnet mounted on the frame is known as the internal magnet and the magnet mounted on the door or window is known as the external magnet The balancing of the switch is accomplished by the magnetic field of the magnets in the open position When the magnetic field is disturbed by movement of the external magnet, the switch closes While the door or window in the normal closed position, the magnetic field will cause the switch to be stable If the door or window is opened, the magnetic field is disturbed and the switch becomes unstable activating an alarm Balanced magnetic switches provide a higher level of security than do the magnetic switches The switches are used on doors and windows and are used with other devices such as motion sensors Some conditions that cause unreliable detection and nuisance alarms in balanced magnetic switches follow: As in the case of the magnetic switches, excessive door or window movement will cause too much play in the door or window and its frame So if the door is shaken the contact will be broken and an alarm will be sent The wind can rattle doors and windows causing false alarms because the contact is broken Improper alignment of the switch on the door or window with the switch on the frame will cause false alarms Improper alignment can be caused by a bent or warped frame The fluctuations in the frame due to seasonal conditions such as heating and cold can cause the magnetic switch to lose contact and send an alarm The balanced magnetic switch cannot be defeated by using a stronger external magnet and placing it on the switch when the door or window is open Balanced magnetic switches are widely used today because they cannot be easily defeated by using a stringer external magnet or taping over one of the magnets Figure 7-1 shows the mounting of a balanced magnetic switch The magnetic switch is the same as the balanced magnetic switch mounting
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FIGURE 7-1 Balanced Magnetic Switch
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Mechanical Switches
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Mechanical switches are contact switches used to detect the opening of a door or window Mechanical switches are spring-loaded plungers that are triggered when the door or window is opened The switches send an alarm when there is physical disturbance to the sensor Mechanical switches, like the magnetic switches, are mounted on doors and windows and are used in conjunction with a motion sensor to compensate for the failed alarm if is compromised Some conditions that cause unreliable detection and nuisance alarms in mechanical switches are: As with all of the switches, excessive door or window movement will cause too much play in the door or window and its frame The alarm will be triggered
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if there is enough movement in the door or window The wind can rattle doors and windows causing false alarms because the contact is broken Improper alignment of the switch on the door or window with the switch on the frame will cause false alarms Improper alignment can be caused by a bent or warped frame The fluctuations in the frame due to seasonal conditions such as heating and cold can cause the magnetic switch to lose contact and send an alarm The mechanical switch can be defeated by holding the switch in the open position and taping it when the door or window is open A small piece of metal will also hold the switch in the open position Both of these methods will bypass the alarm and permit undetected entry when the switch is supposed to be in the closed position
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