FlexPI Product Guide
Page 7
Lead-in cable
The FlexPI lead-in cable is virtually identical to the sensor cable, but does not detect vibrations
(non-detecting cable). Lead-in cable is available in 30 m (98 ft.) lengths for installations in which
the processor must be located away from the start point of the detection zone. It can also be used
to bypass sections of the mounting surface.
Applications
The FlexPI sensor system provides penetration detection for virtually any type of building material
(e.g., brick, stone, concrete slabs, poured concrete, cinder-block, stucco, wood, drywall, ceramic,
steel) as well as for security cages, fences, vaults, window casings, doors, ceilings, floors, security
grilles, etc. However, due to the different vibration transmission characteristics of each type of
building material or surface, the sensor cable from one processor should be mounted on only one
type of surface.
Installing a FlexPI system is a four step process:
1.
Design the system and obtain the necessary components.
2.
Install the sensor cable and terminator.
3.
Install the processor and enclosure.
•
power supply
•
alarm communication wiring
•
optional lead-in cable if the processor will be located away from the protected surface
4.
Setup and calibrate the system.
Security planning
With security systems, there is a trade off between a high probability of detection (Pd) and an
acceptable nuisance alarm rate (NAR). It is important to determine the security requirements and
expectations for a FlexPI installation. There are a number of factors, which must be considered
when planning the installation. The primary factors are the value of the assets being protected,
and the required level of security.
For a high-security application where a sophisticated attack is possible, the sensor cable spacing
should be kept at a minimum. This will increase the number of cable passes on the protected
surface, and provide the maximum level of protection. Most break-ins occur at the lower levels of a
wall, or roof. Therefore, using additional cable passes on the lower 2 m (6.5 ft.) of the wall or roof
can provide additional security. For lower security applications, where less sophisticated attacks
are more likely (e.g., a smash through intrusion) fewer cable passes can be used to protect the
same surface area.
and
illustrate high, medium and low security
applications.
Another factor is the type of surface. Different types of building materials have different vibration
transmission characteristics. Metallic building materials conduct vibrations quite well. Wood,
plasterboard, cladding and drywall tend to absorb vibrations. Hollow cinder-block walls are more
sensitive than solid block, cement, brick, or stone walls. In addition, masonry and concrete are
more difficult to penetrate than drywall, plaster or wooden building materials.
Note
The FlexPI processor is intended for indoor installation. However, it is
possible to install the processor indoors, and use lead-in cable to
connect the processor to sensor cable that is mounted outdoors.
