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11 Appendices
11.1 Additional Intelligent Detector Information
Additional functions are available for Axis
AX
intelligent detectors from the “Additional Info” field of the Loop View/Edit
display. It is possible to view the internal drift (0-100%), perform a rapid compensation or access any of the internal
EEPROM memory locations. Press the
✔
button and a pop-up window is shown presenting a list of options.
For example:
[Loop 1 Devices] <More>
Press the
buttons to highlight the required menu option and then press the
✔
button to confirm.
11.1.1 View Drift
When View Drift is selected, the display shows the intelligent smoke detectors, on the specific loop, that the panel is
reading (addresses that are blank (without
mark) are addresses allocated to pull stations, input and output
devices). For example, select the View Drift option and the display shows:
[Loop 1 Devices] <More>
Address Additional Info
>001.0
Reading..
002.0
003.0
Reading..
004.0
Reading..
When the reading is complete, the display shows the drift (0-100%) per intelligent smoke detector on the SLC loop.
For example:
[Loop 1 Devices] <More>
Address Additional Info
>001.0
Drift = 0%
002.0
003.0
Drift = 4%
004.0
Drift = 0%
11.1.1.1 Intelligent Detector Drift Compensation
The Axis
AX
intelligent detectors include compensation for sensor drift as part of the internal signal-processing
algorithm. The algorithm will compensate for changes in sensor output caused, for example, by dust in the
chamber, and will therefore hold the sensitivity at a constant level even with severe chamber contamination. This
increased stability is achieved without affecting the detector’s sensitivity to fire.
The compensation level is stored in the detector’s memory as a single value between 0 and 31. The Axis
AX
fire
alarm control panel takes this information and converts it to a more user-friendly value in Drift % (0-100).
Note: The sensitivity of an Axis
AX
intelligent detector does not change unless a detector, which has already
indicated a specific trouble signal “Device Dirty” for detector address at the Axis
AX
fire alarm control panel,
can no longer maintain the programmed/installation location sensitivity. This is why a sensitivity report
from an Axis
AX
fire alarm control panel is not beneficial, instead the Axis
AX
fire alarm control panel provides
a % drift report (dirty detector report) via the Advanced’ Service Tool. The Service Tool allows viewing,
printing, storage, etc. of clean/dirty values (from 0 to 100) for all Axis
AX
fire alarm control panel detectors.
VIEW DRIFT
RAPID COMPENSATION
VIEW EEPROM
