Excessively Dirty Fault Indication; Self Test Abnormal Fault Indication - Simplex LT0290 User Manual And Reference Manual

SIMPLEX 4120 NETWORK FIRE INDICATOR PANEL
OPERATOR MANUAL
The 4120 FIP includes a pre-programmed software point that can be turned on to generate
an "almost dirty" indication. This point is useful when maintenance is being scheduled for
dirty detectors as it provides a means to see if other sensors are approaching a dirty
indicator level.
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3.5.2 Excessively Dirty Fault Indication

An "excessively dirty" fault indication is reported anytime an individual sensor's average
value reaches a slightly higher threshold level. At this point the 4120 FIP can no longer
compensate for dirt and dust contamination and the sensitivity level may begin to drift.
Because false alarms are possible with this condition, sensors must be cleaned as soon as
possible. Although an "excessively dirty" fault condition is reported, the sensor will continue
in operation and will report an alarm condition if one is detected.
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3.5.3 Self Test Abnormal Fault Indication

In addition to the automatic dirty fault and excessively dirty indicators, the 4120 FIP
automatically tests all TrueAlarm™ sensors once every minute. This test raises the
value of each sensor to a value that simulates an alarm. If a value that is not in the
alarm range is reported back to the panel a "self test abnormal" fault will be
displayed for that specific sensor. Since the sensor is not working properly, it must
be replaced immediately.
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Document No: 4100-M004
ALMOST DIRTY
EXCESSIVELY DIRTY
SELF TEST ABNORMAL
June 1997
Page 23
Issue 1.0