Seismic Detectors Application Guide
The Vanderbilt Seismic Calculation Tool can quickly provide this information for the system de-
signer. For more information on the Vanderbilt Seismic Calculation Tool, see Section 6.2 Seismic
Calculation Tool.
6.2 Seismic Calculation Tool
Vanderbilt provides a Seismic Calculation Tool to assist in the design process. Enter the operating
radius of the detector and the dimensions of the protected surface (wall, ceiling or floor). The Seis-
mic Calculation Tool calculates the number of detectors required and the optimum spacing of the
detectors to maximize the system performance.
The calculation tool is available on line at: http://vanderbiltindustries.com. Choose your country
from the list of global websites and select Products-> Intrusion-> Seismic Detectors.
Click on the DOWNLOAD button and save the file to your PC or laptop prior to running
the application.
Figure 6-3: Seismic Calculation Tool
6.3 Manual calculation
System designers and installers can use the information in the following sections to manually cal-
culate the spacing distances and the number of detectors required. Any manual adjustment or cal-
culations should be verified against the optimum results generated by the Seismic Calculation Tool.
System designers and installers must ensure that an alternative layout does not com-
promise security or system performance.
6.3.1 Calculating the number and location of the detectors
This section outlines the process of calculating the location and spacing of the detectors, and then
using this information to calculate the optimum number of detectors for a protected surface.
1. Determine the length (l) and height (h) of the protected surface. The height (h), which will assist
in identifying the operating radius (r). The detectors should be mounted on the horizontal centre
line of the wall to provide a balanced coverage.
Table 6-4 details the maximum wall height for the different operating radius of the de-
tectors. If the wall height/radius is exceeded, another row of detectors would be re-
quired.
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