Appendix G Pre-Alarm (Awacs™) Applications; Overview; Pre-Alarm Applications; Pre-Alarm Alert Level - Ansul AUTOPULSE IQ-301 Installation, Operation And Maintenance Manual

Pre-Alarm (AWACS™) Applications
Appendix G Pre-Alarm (AWACS™) Applications
G.1 Overview
G.2 Pre-Alarm Applications
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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 (Alert and Action) Pre-Alarm
function called AWACS™ (Advance Warning Addressable Combustion Sensing).
G.2.1 Pre-Alarm Alert Level
The control panel software, in addition to checking for alarm levels, checks for
Pre-Alarm thresholds for each ionization or photo smoke detector (not analog thermal
detectors). If a Pre-Alarm level is reached that exceeds the programmed Alert or Action
threshold, the appropriate condition appears on the panel display.
Alert Level Functions
The system performs the following functions when a detector reaches an Alert level:
• The Pre-Alarm LED flashes and the panel sounder pulses until acknowledged.
• An Alert message is sent to the history file and to installed peripheral devices, such
as the LCD-80 and printer. The Alert message is also time-stamped (with the time
that the Alert occurred) to provide historical data about the progress of a fire.
• Zone 99 activates. No other zones or relays activate.
• The Pre-Alarm indication automatically restores 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.
Example of a Pre-Alarm Alert Condition
Figure 153 shows a sample panel display of a photoelectric detector that reaches the
Pre-Alarm Alert condition. In this example, zone 99 is programmed to Alert= 40% of
Alarm. An Alert will occur at measured smoke levels that exceed 0.40 x 2.0% per foot
(30.48 cm) obscuration (low) = 0.80% per foot (30.48 cm) obscuration.
PREALM is the Pre-Alarm
status banner.
PREALM@SMOKE(PHOTO)
WEST@HALLWAY@FLR@5
ALERT: 0.80/2.00%@
12:00P@12/25/97@D13
Alert indicates that the Alert
level is reached.
Figure 153 Sample Screen in Alert Condition
0.80 is a real-time display, updated every few seconds, to show the current reading of
this detector. In this example, the reading equals 40% of alarm, which puts the control
panel into Alert condition.
Smoke (Photo)
is the type code
2.0% is the programmed
of the detector.
alarm threshold (2.0% per
foot (30.48 cm) obscuration
is the low sensitivity setting).
0.80 is the reading of smoke relative
to the sensitivity setting
IQ-301 PN 50036:F 10/29/2001

Overview