Trouble Indications; Trouble Indications For Truealarm Sensors - Simplex 4098 Applications Manual

Trouble Indications

Trouble Indications
The TrueAlarm smoke sensor is a measuring device that sends data regarding smoke density to the
for TrueAlarm
4010, 4020, 4100, 4100+, 4100U, 4100ES, 4008, and 2120 fire alarm control panels (FACPs).
Sensors
The TrueAlarm heat sensor operates in a similar fashion, but sends temperature data 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:
A "Smoke Sensor Dirty" trouble condition is reported any time the average value on an individual
sensor reaches a set threshold value. At this time, the FACP is still compensating for environmental
factors and is holding the set sensitivity level.
A "Smoke Sensor is Excessively Dirty" trouble condition is reported anytime the average value of
an individual sensor reaches a slightly higher set threshold level. At this point, the FACP can no
longer compensate for environmental factors, and the sensitivity level may begin to drift.
Although an "excessively dirty" trouble is reported, the sensor continues to operate and reports an
alarm condition when one is detected.
In addition to the two automatic trouble conditions, the FACPs have digital pseudo points that
must be turned ON to allow a TrueAlarm sensor that is close to being a dirty sensor to report as if
it is "almost dirty." This is useful when maintenance is being scheduled for dirty sensors, as it
provides a means of seeing if other sensors are approaching a dirty state.
The table below shows your responsibilities when certain trouble indications occur.
Trouble Indication
Almost Dirty
Dirty
Excessively Dirty
Self-Test Abnormal
Expired

Dirty

Excessively Dirty
Table 5-4. TrueAlarm Troubles and Descriptions
Using the front panel keys, it is possible for a technical representative to turn
ON a digital pseudo point in the FACP that allows an "almost dirty" sensor to
report a trouble. Although the "almost dirty" sensor is holding its sensitivity
level, you can schedule maintenance for the sensor before the dirty sensor
trouble occurs.
A "dirty" indication means that the sensor is holding its sensitivity level, but that
you should schedule maintenance for the sensor. Clean the sensor as required
and, when necessary, call your local branch office for service.
The "excessively dirty" indication means that the sensor is no longer
compensating for dirt and dust. Because nuisance alarms are possible with this
condition, sensors must be cleaned or replaced immediately. When necessary,
call your local branch office for service.
All FACP system sensors are automatically tested once every minute. When a
sensor fails to report properly to the FACP, a "Self-Test Abnormal" condition
occurs. Since the sensor is not working properly, it must be replaced. Replace
it, or call your local branch office for service.
The FACP panel generates an Expired trouble to notify the user that a
replacement sensor is required. To clear the trouble, a new CRS with a valid
date must be installed, and a hardware reset of the FACP panel must be
performed.
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