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8.1.9 Two-stage alarm with a coincidence including two fire warning devices (variant #8)
After a fire warning device is actuated, it is initially reset and the control panel generates the initial
alarm mode. If, during 8 minutes, the reset device and at least one more device in the same zone are
actuated, the control panel generates a 1
st
stage alarm and the alarming process is the same as in
variant 2. Otherwise, after 8 minutes, the control panel cancels the preliminary alarm mode treating
the device actuation as false and returns to the quiescent mode.
8.1.10 Interactive one-stage alarm (variant #9)
After a detector detects fire factor changes, other detectors located in this zone are informed about
this fact. Confirmation of the changes by other detectors in the zone results in an alarm for this zone
and a 2
nd
stage alarm in the control panel.
In this variant, fire may often be detected much faster than in the cases when the system waits for a
single detector to fulfil a given criterion. Simultaneously, correct location of detectors and selection
of their types does not result in increasing the system vulnerability to interrupting factors.
Depending of the forecast fire types, different smoke (ionising, optical) and heat detectors
combinations may be used. Redundant actuation of a single detector in a given zone also generates
an alarm in this zone and a 2
nd
stage alarm in the control panel.
8.1.11 Interactive two-stage alarm (variant #10)
After a detector detects fire factor changes, other detectors located in this zone are informed about
this fact. Confirmation of the changes by other detectors in the zone results in an alarm for this zone
and a 1
st
stage alarm in the control and the alarming procedure is the same as in variant 2.
In this variant, fire may often be detected much faster than in the cases when the system waits for a
single detector to fulfil a given criterion. Simultaneously, correct location of detectors and selection
of their types does not result in increasing the system vulnerability to interrupting factors.
Depending of the forecast fire types, different smoke (ionising, optical) and heat detectors
combinations may be used. Redundant actuation of a single detector in the zone results in an alarm
for this zone and a 1
st
stage alarm in the control panel and the alarming procedure is the same as in
variant 2.
8.1.12 One-stage alarm with a group-time coincidence (variant #11)
After fire warning devices belonging either to group A or group B are actuated, the devices in this
group are initially reset and the control panel generates the preliminary alarm mode. After the initial
reset, if, during 8 minutes, the devices belonging to group A and B (at least one device in each group)
report actuation, the control panel generates a 2
nd
stage alarm.
Otherwise, after 8 minutes, the control panel resets the preliminary alarm mode treating the devices
actuation as false and returns to the quiescent mode.
Note:
Correct operation of this variant requires that one (preferably two) fire warning device is declared
both for group A and group B. Such created groups must not be separated with any physical
obstacles. Failure to meet the above mentioned requirements may result in constant reset of the
alarming device.
8.1.13 two-stage alarm with a group-time coincidence (variant #12)
After fire warning devices belonging either to group A or group B are actuated, the devices in this
group are initially reset and the control panel generates the preliminary alarm mode. After the initial
reset, if, during 8 minutes, the devices belonging to group A and B (at least one device in each group)
