E - 1
Appendix E
The Alarm Verification feature provides
the MXL with a way to verify an alarm
from area type addressable smoke
detectors connected to the analog
loops or from standard smoke detec-
tors connected to the CZM-4 module.
This feature reduces the incidence of
false alarms.
Revision level 2.00 and higher of the
MXL supports Alarm Verification for
CZM-1.
When a detector is supervised with
Alarm Verification, it is turned off
immediately after the System first
detects alarm causing data from it.
The length of time that the detector is
verified is fixed at 50 seconds. In MXL,
an addressable detector is turned off
by the System ignoring its data; a
standard detector is turned off by the
Alarm Verification
power actually being removed from the
detector. After the turnoff period, the
panel puts that detector into alarm if it
has alarm causing data within 60
seconds of being turned back on. See
the figure below for a graphic illustration
of Alarm Verification.
You can select Alarm Verification for
none, all, or any combination of
addresssable smoke detectors.
Revision level 3.00 or higher of MXL
supports a global verification feature
called Device Confirmation. It provides
adjustable AðB verification times for all
addressable:
Ionization detectors
Photo detectors
Ionization and photo detectors
CAUTION
Use only detectors
which are subjected to air
velocities of less than 100
feet per minute with Alarm
Verification. Under dynamic
air velocity conditions,
smoke may be swept from
a smoke detector after the
initial alarm. That may
cause a long delay before
verification. Do not select
Alarm Verification for
such applications.
A____________________B________________________C
Timeð
A Time at which the System initially recognizes an alarm from a smoke detector.
AðB The 50 seconds during which the System ignores the alarm data
BðC The 60 seconds during which the System alarms if the device is returning alarm data
Line Graph of Alarm Verification
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