3-6
Trouble Conditions
Trouble Indications
for TrueAlarm
Sensors
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 fash-
ion, but it sends temperature data to the control panel instead of smoke density data. The FACP
uses this data to determine whether a trouble has occurred.
The TrueAlarm sensor has two automatic trouble indications. Either condition requires service by a
qualified service technician.
•
Dirty
. A "Smoke Detector Dirty" condition is reported any time the average value on an
individual sensor reaches a set threshold value. The sensor continues to operate at the
programmed alarm threshold.
•
Excessively Dirty
. A "Smoke Detector Excessively Dirty" trouble condition is reported any
time the average value of an individual sensor reaches a level such that full-range alarm detec-
tion is compromised. When a sensor is “excessively dirty,” the sensor will be susceptible to
false alarms.
In addition to the two automatic trouble conditions, the FACP software includes a pre-programmed
digital pseudo point (P132, Sensor Almost Dirty Log Enable) that can be selected through the ES
PC Programmer application. When selected, a system log entry is genereated when a sesnor is
“Almost Dirty.” This feature is used to facilitate maintenance by providing a log of sensors that are
approaching the “Dirty” state.
What to Do when
TrueAlarm Troubles
Occur
System Operators should do the following when these troubles occur.
•
Almost Dirty Trouble
. The system is programmed so that almost dirty sensors report as
dirty. Contact your facilities management personnel to report the trouble and schedule mainte-
nance (cleaning) for the sensors.
•
Dirty
. This trouble means 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.
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