4
Alarms
The default behaviour of the four Alarm states (ALERT, ACTION, FIRE1 and FIRE2) and TRACE (applicable to FT4 and above) is shown
below:
IF LATCHED LEVEL DELAY BEACON
ON;OFF (sec)
SOUNDER
TRACE LATCHED 0.03% 3 Seconds Continuous
ALERT LATCHED 0.04% 3 Seconds 0.5:2 Continuous
ACTION LATCHED 0.06% 3 Seconds 0.5:1 Continuous
FIRE1 LATCHED 0.08% 3 Seconds 0.5:0.5 Continuous
FIRE2 LATCHED 0.1% 3 Seconds Continuous Continuous
TRACE parameters apply when the rotary valve is in the OVERALL position, and all sectors are being monitored. If it is latched, the TRACE
indicator will remain illuminated after the initiating event has ceased. It does NOT mean that the unit will continue indefinitely in TRACE
(scan) mode. The ALERT relay may be functionally changed to act as a TRACE relay instead. Its action will then follow that of the TRACE
indicator.
If ALERT, ACTION, FIRE1 or FIRE2 are unlatched, all resultant actions (Relay contacts, panel indicators, sounder and beacon) will clear if
and when the causative event ceases. If it is latched, all the warning mechanisms are maintained until action is taken by the user (see
below - User Functions). These Alarm states are global - that is, they will be set depending on the smoke density being measured,
regardless of which sector is being sampled. If the smoke density is high enough, they can be set while in OVERALL sampling. Once in
TRACE mode (FT4 and above), each sector has an alarm indicator associated with it. These individual sector alarms pulse progressively,
depending on the degree of Alarm status, in the same way as the Beacon (see above).
In the event of an ASPIRATOR FAULT coincident with any ALARM event, the ALARM indicators that would be ON will flash.
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