Aritech VV600, Планирование и руководство по установке

Страница: 12 / 32

Planning and Installation manual VV600/VV602Plus 10
4. P
LANNING INSTRUCTIONS
4.1. Planning limitations
Although the Aritech seismic detectors are designed to provide a high level of
immunity against nuisance alarm sources, some precautions have to be observed.
Below we would like to mention some circumstances to preferably avoid:
4.1.1. Electric motors, transformers, fans, air conditioners.
Do not apply the detectors in close proximity of electrical devices creating
mechanical vibrations in the protected structure. If possible avoid mechanical
contact between such devices and the protected surface, or reduce the vibrations
by using suitable insulating materials.
4.1.2. Water piping
The flow of water through piping, when in mechanical contact with the protected
structure, emits a strong signal in the structure itself, which may cause nuisance
alarms.
4.1.3. Ultrasound detectors
May emit a signal that is within the frequency range of the detectors. It is advisable
to avoid placing ultrasound detectors closer than two meters from the protected
surface. It is useful to remember, in this respect, that it is not normally the detector
itself picking up the ultrasound signals, but mainly metal objects attached to the
protected surface (vault door, steel cabinets, etc.).
4.1.4. Bells
May generate overtones in the frequency range of the detectors. A simple solution
is to suppress the overtones through application of a piece of tape on the bell.
4.1.5. Human activity
Normally, people in close proximity to the protected area are not a problem. It is
impossible, however, to always predict their activities. It is therefore advisable to
keep a look-out for: floors running over the vault’s ceiling, stair-ways adjacent to
vaults and safes on concrete or marble floors. In most cases, carpeting or the
application of insulation materials will solve any problems that may occur.
4.2. Detection range of the VV600/602Plus
The range of each installation depends on:
•
The construction of the vault or safe.
•
The vibration characteristics of the construction.
•
The sensitivity required in each sensor.
•
The natural vibrations and ambient noise level in the premises.
To determine these factors, it is best to perform a field test. The field test should
include the following:
•
Visual inspection of the vault or safe.
•
A test to determine the existence of irregularities in the construction.
•
A noise test.
•
A plan to define the location of each sensor.
As a guide-line we have made a table showing the range as a function of the
methods of attack and type of material in the construction of the protected surface.