Once a minute, the 4120 software performs a self-alarm test of each TrueAlarm
TM sensor. The self-alarm test raises
the value of each sensor to a value that simulates an alarm condition. If the sensor reports back a value that is not
within the alarm range, a “self-test abnormal” trouble will be displayed for that specific sensor.
The following paragraphs discuss the responsibilities of operators when these trouble indications occur.
ALMOST DlRTY
INDICATION
Using the front panel keypads, it is possible for a SIMPLEX Field Service representative to turn on a system point
that allows an “almost dirty” sensor to report a trouble. Although the “almost dirty” sensor is holding its sensitivity
level, the operator can schedule maintenance for the sensor before the dirty sensor trouble occurs.
DIRTY
INDICATION
A “Dirty” indication means that the sensor is holding its sensitivity level, but that the operator should schedule
maintenance for the sensor. Clean the sensor as required, and, if necessary, call Simplex for service.
EXCESSWEL
Y
DlRTY
INDICATION
The “Excessively Dirty” indication means that the sensor may no longer be compensating for dirt and dust. t3ecause
false alarms are possible with this condition, sensors must be cleaned as soon as possible. If necess.ary, call
Simplex for service.
SELF-TESTABNORMAL
INDICATION
All system sensors are automatically tested once every minute. If a sensor fails to report properly to the NDU, a “self-
test abnormal” condition occurs. Since the sensor is not working properly, it must be replaced. Replace it, or call
Simplex for service.
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