Bosch FAS-420-TT Series - Planning Limits

38 en | Planning Aspiration smoke detector LSN improved
2020.04 | 6.1 | F.01U.029.275 Operation guide Bosch Sicherheitssysteme GmbH
Class Description Application example
A Aspirating smoke detector with
extremely high sensitivity
Very early detection: significant smoke
dilution through air conditioning in IT
areas
B Aspirating smoke detector with
increased sensitivity
Early detection: significant time gains
thanks to very early fire detection
(without air condition)
C Smoke aspiration system with normal
sensitivity
Normal detection: fire detection with the
advantages of smoke aspiration systems
Notice!
Depending on the number of air sampling openings, fire sensitivity classes A, B and C can all
be achieved with the detection modules available.
The table shows the sensitivities you can choose from
Response sensitivity (main alarm)
DM-TT-50(80) Detector
Module
DM-TT-10(25) Detector
Module
DM-TT-01(05) Detector Module
Not permissible 0.8%/m (2%/m) light
obscuration
0.12%/m (0.4%/m) light
obscuration
Not permissible 0.4%/m (1%/m) light
obscuration (standard)
0.06%/m (0.2%/m) light
obscuration (standard)
1.0%/m (1.6%/m) light
obscuration
0.2%/m (0.5%/m) light
obscuration
0.03%/m (0.1%/m) light
obscuration
0.5%/m (0.8%/m) light
obscuration (standard)
0.1%/m (0.25%/m) light
obscuration
0.015%/m (0.05%/m) light
obscuration
The planning of the monitoring area always occurs according to the national guidelines for
point-type smoke detectors.
Notice!
The sensitivity value is based on measurements with standard test fires (old value in
brackets).
4.5 Planning limits
The following limit values must always be observed for the FAS-420 series:
Limiting values Maximum number of air sampling openings per detector
module
32 (2 x 32)
Maximum total pipe length 300m (2 x
280m)
Minimum pipe length between 2 air sampling openings 4m
Minimum pipe length between 2 air sampling openings 12m