Programming Status Change Options
96 AFP-200 PN 15511:H2 10/14/2002
3.5.5 How to Set Detector Selections (2=SENS/COMP)
Purpose
The Sens/Comp option lets you select detector sensitivity and drift compensation for
photoelectric and ionization detectors.
You can select drift compensation for any intelligent detector on the SLC. Drift
compensation provides accurate and stable readings of smoke, counteracting long-term
drift caused by dust contamination and other long-term environmental factors. Drift
compensation quickly detects true fires, rejects false signals—while allowing a detector
to remain within performance specifications throughout its life span. Table 30 lists the
three drift compensation measurements performed for each ionization or photoelectric
detector.
Table 30 Drift Compensation Measurement
The control panel converts the present reading to percent per foot obscuration or
percent of alarm, based on its position between the known clean air and test values. The
accuracy of this measurement method is sufficient to meet the NFPA 72 requirements
as a calibrated smoke test instrument.
What are Detector Sensitivity Selections?
You can set the sensitivity level for an ionization or a photoelectric detector. Table 31
contains a list of UL-approved detector sensitivity settings for intelligent detectors.
Table 31 Ionization and Photoelectric Detector Sensitivity Selections
How to Select Detector Sensitivity and Drift Compensation
To change detector sensitivity, drift compensation both, follow these steps:
1. From the Status Change screen (Figure 84 on page 93), press the 2 key to display
the Detector Sensitivity/Comp screen (Figure 88).
Figure 88 Detector Sensitivity/Comp Screen
Feature Description
long-term measurement of
location’s clear air
An average reading which adjusts to gradual buildup of dust
contamination, unaffected by true smoke, even from
smoldering fires.
alarm test level
measurement
A periodic detector test that commands each detector to
simulate an alarm level reading from the sensing chamber.
current chamber reading Under normal conditions, this reading is close to the stored air
clear value. If smoke occurs, the reading moves toward the
alarm test level.
Type of Detector Sensitivity Selection
Ionization (FSI series) H (high) M (medium), or L (low)
Note: If using older (DH500 series) ionization
detectors for duct applications, set the detector
sensitivity to “H”.
Photoelectric (FSP series) 2.0, 1.5, of 1.0 percent obscuration per foot
Status Change
Password
DET.@SENS/COMP
ENTER@POINTS:@AA,E
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