3-3
TrueAlarm
devices are considered sensors instead of detectors because these devices do not
determine alarm conditions. Instead, the TrueAlarm smoke sensor is a measuring device that
sends data regarding smoke density to the 4100 FACP. The TrueAlarm heat sensor operates in a
similar fashion, but it sends temperature data to the control panel instead of smoke density data.
The 4100 uses this data to determine whether a trouble has occurred.
The TrueAlarm sensor has two automatic trouble indications.
• Dirty. A “Smoke Detector Dirty” condition is reported any time the average value on an
individual sensor reaches a set threshold value.
• Excessively Dirty. A “Smoke Detector Excessively Dirty” trouble condition is reported
any time the average value of an individual sensor reaches a slightly higher threshold level.
In addition to the two automatic trouble conditions, the 4100 software includes a pre-programmed
digital pseudo point (P132, Sensor Almost Dirty Log Enable) that can be turned ON through the
4100 PC Programmer application to allow a TrueAlarm sensor that is close to being dirty to report
as if it were one. This is useful when maintenance is being scheduled for dirty sensors, as it
provides a means of seeing which sensors are approaching a dirty state.
Once a minute the 4100 performs a test of each TrueAlarm sensor. The 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 is displayed for the sensor.
System Operators should do the following when these troubles occur.
• Almost Dirty Trouble. In this case, a Simplex Technical Representative has programmed
the system to allow almost dirty sensors to report as dirty. Contact your facilities
management personnel to report the trouble and schedule maintenance (cleaning) for the
sensors.
• Dirty. This trouble means the sensor is holding its sensitivity, that maintenance should be
scheduled for the sensor. Contact your facilities management personnel to report the trouble
and schedule maintenance (cleaning) for the sensors.
• Excessively Dirty. This trouble means the sensor is no longer compensating for dirt and
dust. False alarms are possible in this condition and sensors should be cleaned as soon as
possible. Contact your facilities management personnel to report the trouble and immediately
schedule maintenance (cleaning) for the sensors.
• Self-Test Abnormal. All TrueAlarm sensors are automatically tested once a minute. If a
sensor fails to report properly to the 4100 FACP, a Self-Test Abnormal trouble occurs. This
indicates that the sensor is not working properly and needs to be replaced. Contact your
facilities’ management personnel to report the trouble.
Overview, Continued
Trouble Indications
for TrueAlarm
Sensors
What to Do when
TrueAlarm Troubles
Occur
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