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S-Quad
CoP 0001 Coverage distance multiplication factors
The table below shows how the EN54-23 coverage specification will vary with the ambient light level and if the VAD can be viewed
directly or indirectly i.e. if it relies on reflections to be viewed.
As S-Quad is a sensor and a VAD, then its placement must always be
emergency. The coverage of the VAD has been designed so that in most cases it can match the coverage of a particular sensor. It is
however advisable to site the VAD so that direct viewing is possible to maximize the VAD coverage.
Ambient light level (Lux)
<100
100-200
200-300
300-400
400-500
500-600
600-700
700-800
Example 1:
A S-Quad VAD is used in an open area with a rating of O-5-14. The location has an ambient light level of up to 480 Lux and it can be
viewed directly. The sensor is a Optical-CO-Heat. The maximum mounting height is:
5 x 1.1 = 5.5m
It will have a maximum coverage diameter of:
14 x 1.1 = 15.4m (15m)
However as the Optical and CO sensor has a coverage diameter of 15m then this will limit the maximum VAD diameter to 15m.
The maximum square spacing will then be the same as a smoke or CO sensor:
15 x 1/1.414 = 10.6m
Example 2:
A S-Quad VAD is used in an open area with a maximum rating of C-6-16. The location has an ambient light level of up to 490 Lux
and it can only be viewed indirectly. The sensor is a Heat-only. The maximum mounting height is:
6 x 0.6 = 3.6m
It will have a maximum coverage diameter of:
16 x 0.6 = 9.6m
In this case because the viewing is indirect and the ambient light level is quite high, then the VAD will limit the coverage diameter of
the heat sensor from 10.6m to 9.6m.
The maximum square spacing will then also be limited by the VAD:
9.6 x 1/1.414 = 6.8m
Example 3:
A S-Quad VAD is used in a corridor that is 2m wide with a rating of C-3-10.8. The location has an ambient light level of up to 350 Lux
and it can be viewed directly. The sensor is an optical-heat. The maximum mounting height is:
3 x 1.4 = 4.2m
It will have a maximum coverage diameter of:
10.8 x 1.4 = 15.1m (15m)
However the optical-heat sensor has a coverage diameter of 15m and this will limit the maximum VAD diameter to 15m.
The maximum spacing along the 2m corridor will then be the same as the optical-heat sensor:
15m
4188-1073 issue 3_2-17_P2_S-Quad
suitable for both fire detection and warning occupants of an
Ceiling mount direct viewing
2.8
2.4
1.9
1.4
1.1
0.9
0.7
0.5
Description & Commissioning
Ceiling mount indirect viewing
1.3
1.2
1
0.8
0.6
0.5
0.4
0.3
7
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