Functions - Bosch FAS-420-TM Operation Manual

FAS-420-TM 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 and water
separators; see Section 2.6 Pipe System Components, page 22.
2.4

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 detector module (see
Figure 2.4).
Detection
Depending on the response sensitivity of the detector module in use and the alarm threshold
programmed, the FAS-420-TM aspirating smoke detector triggers the alarm when the
corresponding air obscuration threshold is reached. The alarm is displayed via the pre-alarm
or main alarm LED on the device and forwarded to a connected fire panel.
Various delay times can be set for the alarm thresholds, as well as for displaying and
transferring malfunctions (see Section 4.4.3 Parameter Settings via Programming Software,
page 63). 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.
Fire source identification
Fire source identification is possible if an I pipe is planned for a maximum of five areas or
devices. The procedure can be divided into four phases (Figure 2.5 to Figure 2.8).
–
Figure 2.5 Phase 1: Normal operation
Bosch Sicherheitssysteme GmbH
Phase 1
In its general operating state, the FAS-420-TM-R/-RVB Aspirating Smoke Detector
extracts air samples from the monitoring range and analyzes these for the presence of
smoke particles.
E 10
9
8
D
7
C 6
5
4
B
3
2
A 1
FAS-420-TM series
Operation Guide
Technical Specifications | en
F.01U.088.878 | 4.1 | 2010.11
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