Bosch FCS-320-TP2 Operation Manuals page 13

Aspirating Smoke Detector
The LOGIC · SENS intelligent signal processing compares the measured smoke level with
known disturbance variables and decides between alarm and deception.
Detector module monitoring
Each detector module is monitored for contamination, signal malfunction and removal. Soiling
of the detector module has no effect on its sensitivity. With all variants, any malfunction is
displayed via the malfunction LED and transferred to the fire panel. Malfunctions caused by
brief environmental fluctuations can be eliminated with a time-delayed setting.
Airflow Monitoring
An airflow sensor checks the connected pipe system for breakage and obstruction.
The airflow sensor can – depending on the configuration of the pipe system – detect at least a
50% obstruction to a complete obstruction of the air sampling openings and a breakage in the
pipe system that results in a 50% loss from the air sampling openings. Should the fan fail, the
airflow in the pipe system is interrupted and this causes a blockage message. Airflow
monitoring is temperature-compensated and can be set depending on the air pressure.
On expiry of a defined delay, the malfunction is displayed on the aspirating smoke detector
and the message is transmitted to the fire panel. The monitoring window thresholds can be
modified to suit the environmental conditions (see Airflow Monitoring).
The principal signal curve of the airflow sensor is indicated in Airflow Monitoring.
S
Example of the signal process of the Airflow sensor in case of
malfunctions
Fault Indication
An imminent detector module or airflow malfunction generates a malfunction message that is
displayed on the FCS-320.
Flash code for malfunction detection
Malfunctions and certain device statues are displayed using various LED flash codes on the
detector module's electronics PCB. Thus it is possible to differentiate quickly among
malfunctions that can be caused by a defective detector module, an obstruction, or a break in
the pipe system.
Resetting via fire panel
A malfunction message is reset via the connected fire panel. The panel resets alarm and
malfunction messages on the unit while simultaneously resetting the detector line via the
reset board.
Calibrating the airflow sensor
Automatic airflow sensor calibration makes it significantly easier to start the FCS-320. The
initialization phase is carried out according to or independently of the air pressure as desired.
Bosch Sicherheitssysteme GmbH
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Operation Guide
Technical Specifications | en
S Airflow sensor signal
4
t Time
1 Normal airflow
6
2 Airflow too weak
3 Airflow too strong
5
4 Breakage
t
5 Obstruction
6 Monitoring window
7 Delay
8 Malfunction message
2018.04 | 2.0 | F.01U.130.926
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