16
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 FACP. The TrueAlarm heat sensor operates in a
similar fashion, but it sends temperature data to the control panel instead of smoke density data.
Also, CO heat/smoke sensors operate just like the TrueAlarm heat/smoke sensors. The FACP
uses this data to determine whether a trouble has occurred.
The TrueAlarm and CO sensors have three 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.
Expired Trouble. An “Expired Trouble” condition is reported anytime a CO sensor has
reached the end of its useful lifetime.
In addition to the three automatic trouble conditions, the FACP software includes three pre-
programmed digital pseudo points: P132, P463 and P464. The pseudo point P132 (Sensor Almost
Dirty Log Enable) can be turned ON through the FACP 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. The pseudo points P463 and P464 are used to log all the CO sensors
that will expire in 6 and 12 months respectively.
Once a minute the FACP 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 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.
Expired. This trouble means that the CORC (CO Replacement Cartridge) needs to be
replaced.
Almost Expired. This trouble means that the CORC is almost at the end of its lifetime
and would need to be replaced within 6 or 12 months, depending on the system configuration.
_______________________________________________________________________________
65BTrouble Indications
for TrueAlarm
Sensors
66BWhat to Do when
TrueAlarm Troubles
Occur
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