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Pulse up – down counter for smoke & temperature
19.1.3
When 2S+deltaT > the alarm threshold level, "1" is added to the counter every second.
When 2S+deltaT < the alarm threshold level, "2" is subtracted from the counter every
second.
19.2
Fire judgement
The fire judgement is dependent on the alarm threshold level, which is dependent on the
area alarm algorithm ("learning mode" in the following tables) and a delay time, which is
dependent on if the cause of alarm is smoke S, temperature T or deltaT or a combination
of smoke and temperature 2S+deltaT and also the area alarm algorithm.
When the counter shows "9" (i.e. at the earliest after nine seconds in case of S or 2S+deltaT
and after three seconds in case of T or deltaT), the delay time starts and has to run out
before a fire alarm will be activated in the CIE.
19.3
Alarm threshold levels
Depending on the detector type, mode and learning condition, there are alarm threshold
levels (S, T, deltaT and 2S+deltaT) for pre-warning, fire alarm and heavy smoke / heat
alarm.
The following fire alarm threshold levels are valid for the different type of detectors:
4452:
4401:
4400:
19.4
Alarm Delay Time
The alarm delay time varies for the different types of detectors depending on the cause
of alarm, Area alarm algorithm and the values before / after the fire alarm threshold level
was exceeded.
Technical/Programming Manual
133
FT1020G3 Rev 2.2.1
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