Seismic Detectors Application Guide
a) A temporary power source, 12v dc, a battery would suffice
b) A GMXS5 external test transmitter
c) At least 2 x GM7xx detectors
d) Interconnecting cable for power and/or signalling
The basic guidelines for seismic detection in concrete vaults, strong rooms and modular vaults us-
ing the GM730, GM760 & the GM775 seismic detectors are as follows:
A minimum of one detector should be provided in the following surfaces of the vault:
Floor
Ceiling
Door
Each of the four walls
The size of the vault, plus the coverage area will determine the exact number of detectors required.
Figure 6-6: Modular vault - detector positioning
Consider the size of the wall where the door is located. A larger wall and/or the con-
struction and fitting of the door may indicate a requirement for additional detection on
the wall.
For more information on installation method and on the mandatory and optional accessories, see
Section 2 Applications.
6.5.1 Interlocking panels
Figure 6-7: Modular vault - interlocking panel construction
Figure 6-7 shows a vault that is constructed using the interlocking panel construction method.
For signal detection purposes, the interconnection between the joints including the use of insulat-
ing/securing materials will determine the efficiency of the acoustic transfer. The width of the panels
that are used will also have a direct bearing on the quantity of detectors that are required for ade-
quate coverage of the protected area.
The expanded section of Figure 6-7 shows a plan view of the joints.
As construction methods of vaults may vary, the transfer of operating radius from one
surface to an adjacent surface should not form part of any calculation.
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