Calculating The Number Of Detectors Required - Example 2 - Bosch ISN-SM-30 Application Manual

Design
6
Figure 6-5: Wall design example 1 - proposed detector spacing
6.1.2

Calculating the number of detectors required - Example 2

This installation utilizes ISN-SM-90 detectors on a concrete wall.
Radius
(m)
4
4
4
4
Table 6-2: Wall design - 4m detection radius
Table 6-2: Wall design - 4m detection radius shows the calculated sd, d1 & d2 distances.
In this example, the distance d1 plus the sd distance does not provide the required detection cov-
erage. If a second sd spacing is used, coverage would be adequate but not balanced.
Figure 6-6: Example 2 - unbalanced coverage
34
Bosch Security Systems
To balance a system design, the distances d1, d2 & sd may be reduced but never in-
creased.
Distances Calculated
Length (m)
d1
sd
sd
d2
Seismic Detectors Application Guide
Recommended
Distances
3.2 d1
6 sd
6 sd
0.8 d2
Recommended Total
Length (m) Detectors
3
5
5
3
I-200153-1
3
04.2016