Comelit ILS-2, Manual

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Table 6-2: Flow Fault delay times
Bar chart Flow Fault ind. Flow Fault status
LED delay (seconds) exit delay (seconds)
0 15 2
1 30 18
2 60 18
3 90 18
4 120 18
5 150 18
6 180 18
7 210 18
8 240 18
9 270 18
Notes: Timings are approximate.
6.3.3 Flow Sensitivity
This setting determines the sensitivity of the unit in detecting blocked sampling holes or broken pipes.
The default flow sensitivity value of 9, which corresponds to a change in volumetric airflow of ± 20% from the
calibrated reading for at least the duration of the flow fault indication delay, see section 6.3.2 above.
For most installations, especially if compliance with EN54-20 is required,
the default setting should be used.
In certain circumstances, such as rapid changes in ambient air pressure due to the activation of air handling
units, doors opening/closing etc. the default setting may appear to be too sensitive.
Under these conditions, the flow fault indication delay setting should be increased to allow time for the air
pressure to stabilise after the temporary event.
Decreasing the flow fault indication times is only necessary under extreme operating conditions.