Table of Contents
Advertisement
Appendix
9
9
.
.
5
5
.
.
4
4
D
D
R
I
F
T
R
I
F
T
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
Indicates
Message
N/A
Compensation is within recommended range.
LOW
A hardware problem in the detector.
THRESHOLD
MAINTENANCE
Dust accumulation that is near but below the
REQ
allowed limit. The Maintenance Required is an
alert level that indicates the need for maintenance
before the performance of the detector is
compromised.
MAINT.URGENT
Dust accumulation above the allowed limit.
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.
BC-200 Manual – P/N DOC-01-013
C
C
O
M
P
E
N
S
A
T
I
O
N
O
M
P
E
N
S
A
T
I
O
N
Detector Compensation Percentage
Range
Ion
Photo
Laser
6 - 91
6 - 91
3 - 82
0 - 5
0 - 5
0 - 2
92 - 99
92 - 99
83 - 99
100
100
100
Acclimate
Smart 4
IntelliQuad
0 - 79
N/A
80-99
100
107
Hide quick links:
Advertisement
Table of Contents
