Comelit IFT-P, User Manual

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1.3 Flow monitoring
The monitoring system checks for any blockages, disconnections or gaps in the piping, making sure that
the airflow level is not above or below the set thresholds. The flow thresholds are linked to the airflow
specified during standardisation. Flow standardisation establishes the exact amount of air for that system
during normal operation and sets this flow value to 100%. The procedure is carried out during
commissioning. The detector has default flow fault thresholds and corresponding delay times, values which
can be changed using the VSC configuration software.
1.4 Alarms
The default settings for the four alarm statuses ALERT, ACTION, FIRE 1 and FIRE 2 are listed in the table
below:
Table 1-1: Standard alarm status behaviour
Level Behaviour Class A/B/C threshold Delay
Alert Stored 0.04% obs/m 3 sec
Action Stored 0.06% obs/m 3 sec
Fire 1 Stored 0.08% obs/m 3 sec
Fire 2 Stored 0.1% obs/m 3 sec
If an alarm is not stored, the corresponding relay and indications on the display will automatically revert to
normal if the cause disappears. On the other hand, if it is stored, all indications and activations will remain
active until the user intervenes manually. These alarm statuses are linked to specific air clouding values
read by the analysis chamber, regardless of the sector from which the particulate matter originated.