Bosch FCS-320-TM Operation Manual page 15

FCS-320-TM Aspirating Smoke Detector
Figure 2.8 Phase 4: Identification of fire source by reversing the fan's direction of flow
Once the fire source has been identified, it is displayed via a corresponding display on the
FCS-320-TM-R.
Detection
Depending on the response sensitivity set on the detector module (0.5%/m to 2%/m light
obscuration), the FCS-320-TM-R triggers the main alarm when the appropriate light
obscuration is reached. The sensitivities can also be set at intervals of 0.1%/m using the
FAS-ASD-DIAG diagnostic software. The alarm is displayed via the alarm display on the unit
and forwarded to the fire panel connected. The alarm thresholds and the display and
transmission of malfunctions can be allocated different delay times. The intelligent
LOGIC·SENS signal processing hides misleading values that are similar to those shown in the
event of a fire, and ensures a high level of security against deceptive alarms.
Alternative sensitivity
The FAS-ASD-DIAG diagnostic software allows the sensitivity set on the detection unit to be
changed if necessary.
Monitoring unit
The detection unit is monitored for contamination and for signal malfunction. A malfunction is
displayed on the unit and forwarded 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 (see
Section 3.2 Principles of Pipe Planning, page 32) and the setting of the airflow sensors - detect
an obstruction of a single air sampling opening. The 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 Section 3.3 Airflow monitoring, page 34).
The principal signal curve of the airflow sensor is indicated in Figure 2.9.
Bosch Sicherheitssysteme GmbH
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FAS-420-TM series
Operation Guide
Technical Specifications | en
F.01U.130.928 | 1.0 | 2009.11
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