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LSN Peripherals | LSN Seismic | 323
The detection zone is identified as the surface of a
mechanical obstruction (vault or wall of an armored
cabinet) that is being monitored by a detector. The
detection zone is highly dependent on the material of the
object being monitored. Due to practical experience, the
effective range for steel and iron-reinforced concrete is r =
4 m.
The detection zones for detectors on vault walls can extend
along a part of the ceiling or the floor if the rebars are well
connected to each other. In such cases the effective range
is reduced to 3/4 of the set zone.
Joints always create attenuation between two materials for
impact sound transmission.
Note It is essential that each folding door on a vault
is fitted with a detector. The body of a vault
must be fitted with at least one detector.
Note If the vault dimensions go beyond the
detection zone of one detector, (particular
attention must be paid to range reduction over
body edges), additional detectors should be
included in planning. When used on modular
vaults, please take the panel structure into
consideration when allocating detectors.
Surface monitoring
To facilitate planning for large surfaces, convert the circular
detection zone into a square:
•
For 75% surface monitoring, convert diameter to 8 m x
8 m square
•
For 100% surface monitoring, create a 6 m x 6 m square
within circle
Interim values can also be selected. Multiple detectors do
not mutually influence each other.
Panel-structured strong room
Vault with detector allocation
Weld wall/wall corner connection end to end
General guidelines
Guidelines apply to the following element dimensions:
Thicknesses of 100 mm to 400 mm
Widths up to 1000 mm
Lengths up to 6500 mm
When using a seismic detector on steel and concrete
modular vaults, the following principles must be observed:
•
One detector for a maximum of five wall panels, with
the detector placed on the central panel.
•
All joints between panels must also be welded to a
screw connection every 40 to 50 cm with a weld seam
3 to 4 cm long.
•
Corner connections for wall panels must be welded
from end-to-end if the detection zone is to be used over
the corners.
•
For wall panels with assembled detectors set to
sensitivity A, the directly adjacent floor and/or ceiling
panel can be included in the detection zone, if the
relevant impact position is welded end-to-end.
•
With mixed structures that combine various panel
thicknesses, impact positions must always be welded
end-to-end.
•
Avoid placing detectors directly on panels where
bearings from cassette transport lifts, ventilators or
other mechanical units are fixed.
•
Panels with an inlet or outlet opening should always be
fitted with a detector that also monitors the adjacent
panels.
•
Always place a detector on each individual door.
•
Settings in accordance with installation manual for
GM 570 LSN seismic detectors:
Application Sensitivity Response time
Max. 5 elements A Standard
Max. 3 elements B Standard
On doors C or D Delayed
Information on night safes:
Dropping cash boxes into night safes results in brief, acute
seismic signals. There are several ways of reducing these.
•
Joint between inlet channel and night safe
www.boschsecurity.com Bosch Security Systems B.V.
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