Contrary to some crime scenes in TV Modern alarm systems are very well protected against sabotage. The only way to sabotage an alarm system, their manipulation in the disarmed state. Here are a few possibilities of sabotage and how they can be prevented:
Separation of a detector
As between a DC power system and detector, a constant voltage must be applied; an interruption would lead to an immediate alarm. In systems with bus technology, the central control unit immediately detects a missing element and triggers an alarm.
Bridging the detector
In any DC detector is a firmly defined resistance. If these bridges each, eg through a previously already rigged alarm device or via a normal wire, the measured resistance value which is recognized by the Central and evaluated as (sabotage) alarm changes.
Cover of a motion
Modern IR motion has a visual recognition. If they are sprayed with paint or covered with a cardboard or the like, is the altered “view”and reported as a tamper alarm.
Manipulation of the peripheral inside
Theoretically, it would be possible to manipulate the release of a contact detector. However, modern and older elements have a so-called cover contact, which is connected in parallel with the alarm contact or connected to the tamper line. If the housing is opened when armed, the alarm is triggered (“Connection Error”).
Caps of the leased line
Since many plants have a major indicator that signals an alarm via a dedicated line to the local police, it sounds alluring, the leased line to cut. The problem, however, is that the main detector must continuously transmit a signal to the receiving station the police. If this signal is not received, the receiver reports immediate alarm. In addition to the signal line, the status is also monitored with a resistance on the part of the receiver, which prevents the lock-up.
Separation of the telephone line
This could increase the dialer will not perform more alarm call. However, this must be a regular, a potential perpetrator unknown, transmit intervals a status report to a recipient. If the so-called routine callout, assisting measures are initiated depending on the object and guidelines.