Technical/Programming Manual
FT1020G3 Rev 2.2.1
133
19.1.3
Pulse up
– down counter for smoke & temperature
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.
