Cleaning; Photoelectric Smoke Detector Or Sensor Cleaning; Trouble Indications; Trouble Indications For Truealarm Sensors - Simplex 4098 Manual

6.3.11

Cleaning

Introduction
If the sensitivity of the device does not match what is marked on the device's label, clean the device using a source of oil-free, filtered,
compressed air such as Dust-Off, or Tech Duster, and so on.
CAUTION: Notify the appropriate building personnel prior to removing any detectors or sensors from service.
6.3.11.1

Photoelectric smoke detector or sensor cleaning

Blow the compressed air through the open vents around the device so that air enters and cleans the black chamber cover and insect
screen assembly, Part No. 677-224, located under the white protective cover.
If the sensitivity of the device does not match what is marked on the device's label after cleaning, replace the device.
6.3.12

Trouble indications

6.3.12.1

Trouble indications for TrueAlarm sensors

The TrueAlarm smoke sensor is a measuring device that sends data regarding smoke density to the 2120, 4008, 4010, 4020, 4100, 4100+,
4100U, 4100ES, 4010ES, and 4007ES FACPs. The TrueAlarm heat sensor operation is similar, 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:
• Dirty
• Excessively Dirty
A "Smoke Sensor Dirty" trouble condition is reported when 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 when the average value of an individual sensor reaches a slightly higher
set threshold level. At this point, the FACP no longer compensates for environmental factors, and the sensitivity level drifts. 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 so that a TrueAlarm
sensor that is close to being a dirty sensor reports as if it is "almost dirty". This is useful when scheduling maintenance for dirty sensors, it
provides a means of checking if other sensors are approaching a dirty state.
The following table shows appropriate action to take when certain trouble indications occur:
Trouble Indication
Almost Dirty
Dirty
Excessively Dirty
Self-Test Abnormal
Expired
The panel automatically indicates when a sensor is outside the sensitivity calibration. If the sensor has an analog value
below what is listed in the table, the sensor is within its sensitivity setting.
Type
Photo
To view the analog value of a sensor, refer to the operating instructions of the FACP.
page 41
Table 15: TrueAlarm troubles and descriptions
Description
Using the front panel keys, it is possible for a technical representative to turn ON a digital pseudo
point in the FACP so that an "almost dirty" sensor to reports 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, 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, clean or replace the sensors
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. Because 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, install a new CORC with a valid date must, and perform a hardware
reset of the FACP.
Table 16: Analog value of the sensor
Almost Dirty
115
4098 Detectors, Sensors, and Bases Application Manual
Dirty Excessively Dirty
120 135
574-709 Rev. AP