System Overview; Functions - Bosch FAS-420-TT Series Operation Manual

12 en | Technical specifications
3.3

System Overview

The smoke aspiration systems comprise an aspirating detector and pipe system.
The aspirating smoke detector comprises the detector module for detecting the smoke
aerosols, the aspiration unit for transporting the air samples to the detector module and the
airflow sensor for monitoring the pipe system for breakage and obstructions.
The pipe system comprises essentially pipe and fittings. The standard pipe system is made
from PVC or ABS. The pipes used for equipment monitoring should be halogen-free.
Each air sampling opening in the pipe system represents a point detector in the planning.
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Overview of the aspirating smoke detector
To guarantee reliable operation even under the most difficult conditions (clean rooms,
recycling area), there are numerous accessories available, such as air filters, water separators
and detonation safety barriers.
3.4

Functions

Air samples are taken from the area to be monitored via the aspiration unit. They are fed via a
pipe system with defined air sampling openings to the sensitive detection module.
Detector module
Depending on the response sensitivity of the detector module in use and programmed alarm
threshold, the FAS-420 Aspiration smoke detector series triggers the alarm when the
corresponding light obscuration threshold is reached. With the FAS‑420-TP1 and the FAS‑420-
TP2, the alarm is displayed via the alarm LED and/or two alarm LEDs on the unit and
transmitted to a connected fire panel. The FAS‑420‑TT1 and FAS‑420‑TT2 versions offer
differentiated LED displays for info, internal and main alarm. Internal and main alarms are
transmitted to the fire panel (with FPA‑5000 release 2.1; additionally with info alarm from
release 2.5 or above).
Various delay times can be programmed for the alarm thresholds, as well as for displaying and
transferring malfunctions. Alarm messages are saved and are reset after the cause has been
eliminated.
LOGIC×SENS
The LOGIC·SENS intelligent signal processing compares the measured smoke level with
known disturbance variables and decides whether something is an alarm or deception. LOGIC
SENS can be activated or deactivated using the fire panel's programming software.
2020.04 | 6.1 | F.01U.029.275
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Operation guide
Aspiration smoke detector LSN improved
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FAS-420 Aspirating smoke
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Pipe system
detector
Smoke aspiration pipe
Air intake
Air sampling openings
Detector module
including airflow
monitoring
Housing
Aspiration unit
Air outlet
Bosch Sicherheitssysteme GmbH