Appendix
BC-200 Manual – P/N DOC-01-013 107
9
9
.
.
5
5
.
.
4
4
D
D
R
R
I
I
F
F
T
T
C
C
O
O
M
M
P
P
E
E
N
N
S
S
A
A
T
T
I
I
O
O
N
N
Drift compensation uses algorithms that identify and compensate for long term changes in the Analog readings
from each smoke detector. (Typically, dirt and dust accumulation inside the smoke chamber causes long-term
changes in detector readings.) Drift compensation does the following:
• Allows a detector to retain its original ability to detect actual smoke, and resist false alarms, even as dirt
and dust accumulates.
• Reduces maintenance requirements by allowing the control panel to automatically perform the periodic
sensitivity measurements.
The software also provides smoothing filters to remove transient noise signals, usually caused by electrical
interference. Different smoothing algorithms are used, depending on the sensitivity selection of each detector.
The software determines when the drift compensation for a detector reaches an unacceptable level that can
compromise detector performance. When a detector reaches an unacceptable level, the control panel indicates a
maintenance warning. The table below summarizes the three levels of Intelligent Sensing maintenance warnings:
Detector Fault
Message
Indicates Detector Compensation Percentage
Range
Ion Photo Laser Acclimate
Smart 4
IntelliQuad
N/A Compensation is within recommended range. 6 - 91 6 - 91 3 - 82 0 - 79
LOW
THRESHOLD
A hardware problem in the detector. 0 - 5 0 - 5 0 - 2 N/A
MAINTENANCE
REQ
Dust accumulation that is near but below the
allowed limit. The Maintenance Required is an
alert level that indicates the need for maintenance
before the performance of the detector is
compromised.
92 - 99 92 - 99 83 - 99 80-99
MAINT.URGENT Dust accumulation above the allowed limit. 100 100 100 100
A drift compensation value above the recommended range indicates that the detector should be cleaned for
optimum performance. The drift compensation value for a multi criteria detector is not available in CLIP mode.
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