Design
6
31
Bosch Security Systems
Seismic Detectors Application Guide
I-200153-1
04.2016
6
Design
6.1
General Principles
The planning of the detection layout needs to consider many factors, which requires planning with
respect to the type of detector, the accessories that will complement the design & assist with the
detection properties of the detector, to provide the highest security level. Consider the detector
spacing and detection radius to determine the correct number of detectors required to provide com-
prehensive detection coverage.
The coverage area is the maximum area monitored by the detector, which is the maximum detec-
tion radius for material type the detector is mounted on and the setting of the detector.
Figure 6-1: Seismic detector coverage
Figure 6-1: Seismic detector coverage shows an example of the coverage area, for a seismic de-
tector and as the detection radius of the detectors do not overlap, then there will be parts of the
protected surface, which do not have full detection coverage. It is essential that the detectors are
not installed in this manner as the system performance will be undermined.
To remove the areas with inadequate detection coverage then the spacing distance (
sd
) for the
seismic detectors needs to be determined.
Figure 6-2: Seismic detector spacing
Figure 6-2 shows the spacing of the detectors to provide full coverage for the protected surface.
The formula to determine the spacing distance for seismic detectors to provide a comprehensive
detection coverage of the protected surface is:
Spacing distance (
sd
) = operating radius(
r
) x 2 x 0.75
