NFS-640 Operations Manual P/N 51334:B 10/03/2003
65
Appendix B: Intelligent Detector Functions
Note:
For instructions on selecting Intelligent Detector Functions, refer to the
NFS-640 Programming Manual
.
Descriptions for Intelligent Detector Functions
Table 18 Intelligent Detector Functions
Function
Description
Analog Display
The control panel reads and displays analog information from the
318 analog detectors (159 per SLC). The display shows the sensed
air at the detector as a percentage of the alarm threshold for each
detector.
Sensitivity Adjust
Nine selections for manually setting intelligent detector alarm
levels within the UL range.
If using Ionization detectors in duct
applications, set Sensitivity Adjust to Level 1.
Note:
Refer to the
NFS-640 Programming Manual
for detector
sensitivity information.
Day/Night Sensitivity
Operation
You can program the system to automatically force smoke detectors
to minimum sensitivity during the day. Refer to “Time, Date, and
Holiday Functions” on page 59.
Maintenance Alert
When compensation reaches the limit of the amount of drift
compensation that can be safely applied, the control panel reports a
trouble condition, according to National Fire Alarm Code
standards. This condition also activates if the detector remains at
very high or very low measured air levels for an extended time.
Automatic Test
Operation
The control panel performs an automatic test of each detector every
256 minutes. Failure to meet the test limits causes an Auto Test Fail
trouble.
Type Code
Supervision
The control panel monitors hardware device Type Codes for each
installed device at regular intervals (an interval can take up to 40
minutes for a full capacity system). If a mismatch of type compared
to the program occurs, the control panel generates a point trouble
labeled Invalid Type.
LED Control
Operation
A global program selection to prevent detector LEDs from blinking
as a result of polling during normal operation. A typical application
is a sleeping area where a blinking light can distract people. As a
standard function, independent of this programming selection, the
control panel allows all LEDs to turn on in alarm.
Alarm Verification
Timer and Verification
Counter Operation
The control panel performs alarm verification on programmed
intelligent smoke detectors. The Alarm Verification Timer is a
global program selection of 0–60 seconds (ULC installations can
not exceed 30 seconds). Each detector includes a Verification
Counter, which displays the number of times that a detector entered
verification but did not time-out to alarm. The Verification Counter
increments to 99 and holds.
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