Delay Time Of The Alarm Triggering; Activation Threshold Of The Airflow Monitoring; Delay Time For An Airflow Malfunction; Pre-Alarm Threshold - Bosch FCS‑320‑TM Series Operation Manual

Conventional Aspiration smoke detector
Detection module
5.5.2

Delay Time of the Alarm Triggering

The default delay time for the alarm threshold can be changed via the diagnostic software. The
default delay time for the alarm is set to 10 s. If the smoke level increases during operation
until it reaches the alarm threshold, the delay time starts to count down. The message is
transmitted only after the delay time has expired and the smoke level remains at its current
level. In this way, deceptive alarms due to brief strains (e.g. dust) can be prevented.
Detection module
Notice!
The alarm delay time should be set to 0 seconds for test purposes only.
5.5.3

Activation threshold of the airflow monitoring

The activation threshold for an airflow problem can be changed for the detection module via
the FAS-ASD-DIAG.
Detection module
Select the activation threshold in line with Planning.
5.5.4

Delay time for an airflow malfunction

If you wish to change the delay time for transmitting the signal for an airflow malfunction, this
is possible via the FAS-ASD-DIAG.
Detection module
The default delay time is set to 100 seconds. In areas with time-limited disturbance variables
(e.g. air pressure fluctuations), other delay times should be set based on the duration of the
disturbance variables.
5.5.5

Pre-alarm threshold

If you wish to change the pre-alarm threshold, this is possible via the FAS-ASD-DIAG.
Detection module
5.5.6

Fault indication

The collective fault display (airflow and detection module malfunction) can be set to log or not
to log (default) trouble messages. Activation or deactivation is possible via the diagnostic
software.
Bosch Sicherheitssysteme GmbH
Sensitivity
0.5-2%/m
Alarm delay
0 s – 60 s
Activation
threshold
10% - 50%
Fault delay
1 s – 60 min
Pre-alarm threshold (default)
60%
Operation guide
Installing the Aspiration smoke detector | en
Standard sensitivity
0.5 %/m
Alarm delay (default)
10 s
Activation threshold
(default)
20%
Fault delay (default)
100 s
61
Setting intervals
0.1 %/m
Setting intervals
1 s
Setting intervals
1%
Setting intervals
1 s
2020.04 | 2.1 | F.01U.130.928