C.2.2: Maintenance Warnings - Three Levels - Honeywell Notifier NFS2-640/E Programming Manual

Intelligent Sensing Applications
A graphic representation of a detector analog reading using drift compensation and smoothing:
Analog
Reading
C.2.2 Maintenance Warnings – Three Levels
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
maintenance warnings:
Maintenance Level
Low Chamber value
Maintenance Alert
Maintenance Urgent
A graphic representation of the maintenance levels:
96
without compensation
Time
Figure C.1 Graphic Representation of Drift Compensation
Table C.1 Definitions of Maintenance Levels
Indicates
A hardware problem in the detector.
Dust accumulation that is near but below the allowed limit. The
Maintenance Alert level indicates the need for maintenance before
the performance of the detector is compromised.
Dust accumulation above the allowed limit.
Maintenance
Urgent
Maintenance
Alert
Low Chamber
Reading
Figure C.2 Diagram of Maintenance Levels
Alarm Level
with compensation and
smoothing
DIRTY
Acceptable
Range
Low
Value
NFS2-640/E Programming Manual — P/N 52742:L2 7/17/14
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