4.2.3 Sensor mode 2 'Smoke detector'
4.2.3.1 Description
This sensor mode should be selected if fast temperature changes that are not
caused by fire may occur (e.g., in the case of radiant heaters, hot engines). In this
sensor mode the detector only reacts optically; this is comparable with a wide-
spectrum smoke detector. However, because it has a second optical sensor, it
reveals a more balanced response behavior in relation to the different types of fire.
Universal (1):
With 'Universal' the sensitivity and response time to aerosols are between 'Robust'
and 'Sensitive'.
Robust (2):
This parameter set responds to aerosols in a similar way as the neural fire detector
FDOOT271-O in sensor mode 0 with the 'Robust' parameter set, without taking into
account the temperature.
Sensitive (3):
With regard to aerosols, this parameter set reacts in a way that is comparable to
'Fast Response' in sensor mode 0 without temperature influence.
4.2.3.2 Use
No.
Name
Risk of damage to
persons
Concentration of
valuable items
Room
geometry
Deceptive
phenomena
Risk of fire
Critical fire size
small…
large
low…
high
simple…
complex
few…
many
small…
large
small…
medium
1
Universal
2
Robust
3
Sensitive
4.2.3.3 Specification
No.
Name
Response time [s]
Sensitivity
open fire/smoldering fire
[%/m]
1
Universal
50
2.3 / 8
2
Robust
80
2.3 / 8
3
Sensitive
30
1.6 / 5.6
All parameter sets meet the criteria of standard EN 54-7.
Planning
Parameter sets for FDOOT271-O
4
30 | 50
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Summary of Contents for FDOOT271-O
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