Notifier AFP-200

100 AFP-200 Instruction PN 15511:F2 10/11/99
Appendix G  Pre-Alarm (AWACS) Applications
General
The control panel includes a facility to give early warning of incipient or potential fire conditions (U.S. Patent
Pending). This is a two level Pre-Alarm function called AWACS™ (Advance Warning Addressable Combustion
Sensing). The two levels are Alert and Action.
Alert Level Pre-Alarm Operation
The control panel software, in addition to checking
for alarm levels, will check for Pre-Alarm thresh-
olds for each ionization or photo smoke detector
(not analog thermal detectors). If a level is reached
that exceeds the programmed Alert threshold, the
Alert condition is indicated. As an example, a
typical display is shown to the right.
PREALM is the Pre-Alarm status banner.
ALERT indicates that the Alert level is reached.
50% is the reading of smoke in approximate percent of alarm. This is a real-time display which is updated
every few seconds to show the current reading of this detector. In this case, assume that zone 99 is programmed
to ALERT= 40% OF ALARM. This means Alert will occur at measured smoke levels that exceed .40 x 2.0%
per foot obscuration (low) = 0.80% per foot obscuration. In the example above, the reading is at 50% of alarm,
therefore the control panel is in Alert condition.
2.0% is the programmed alarm threshold (2.0% per foot obscuration is the low sensitivity setting).
The following functions are performed at Alert level:
• The above message is sent to the history file and (if they are installed) to the LCD-80 and printer. The message
is sent (and time stamped) only at the time that it first occurred. This historical data could provide valuable
information about the progress of a fire.
• The Pre-Alarm LED flashes and the piezo sounder pulses until acknowledged.
• Zone 99 is activated. Not activated are Zone 00 (general alarm) or any other zone, or trouble relay or alarm
relay.
• The Pre-Alarm indication for this detector will restore automatically to normal if its sensitivity drops below
Alert level. Zone 99 clears automatically when no Pre-Alarm conditions exist.
• A subsequent alarm, or an Action level condition for this detector will clear the Alert indication.
PREALM@SMOKE(PHOTO)
WEST@HALLWAY@FLR@5
50%@2.0%@ALERT
12:00P@12/25/97@D13