Technical / Programming Manual
FT128 Rev 2.2
130
4452: Normally 9 seconds.
4401:
4400:
data1 = The average smoke obscuration value (S) for 60 seconds before the alarm
threshold level was passed.
data2 = The sum of the difference between the smoke obscuration value (S) and the
alarm threshold level every second for nine seconds after the counter shows "9".
data2' = The sum of the difference between the 2S+deltaT value and alarm threshold level
every second for nine seconds after the counter shows "9".
Notes:
Maximum alarm delay time is 60 seconds.
If the cause of alarm is T or deltaT, the alarm delay time will be 9 seconds.
The alarm delay time function will be cancelled after 18 seconds if one of the
following conditions is true:
S (%/m) > fire threshold level (S) x 2
T (°C) > fire threshold level (T)
deltaT (°C/168 sec.) > fire threshold level (deltaT)
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