Configuration and Programming
February 2012 3-22 P/N 06-237058-001
FOOTNOTES (Figure 3-21):
9 Set Detector Sensitivity. Change a Photoelectric Detector’s Pre-Alarm and Alarm
Thresholds.
Purpose: To change the pre-alarm and alarm thresholds of one or more photoelectric detectors.
Alarm thresholds can be set in 0.1 percent-per-foot increments. A pre-alarm threshold can also be
set anywhere within the obscuration range of 0.2 to 3.4 percent per foot, but must be less than the
detector's alarm threshold. Two additional alarm-reporting ranges are defined for special
applications. The in-duct range refers to detector placement in an air duct. The DH-2000 range refers
to detector placement in a DH-2000 Duct Housing with associated sampling tubes to monitor the air
in either a supply- or return-air duct. The alarm ranges for these special applications are as follows:
Photoelectric detectors can be automatically programmed to change alarm thresholds by time
of day if they are configured for day/night operation. The night alarm thresholds must be less
than the corresponding day thresholds.
10 Set Detector Sensitivity. Change a Thermal Detector’s Pre-Alarm and Alarm Thresholds.
Purpose: To change the pre-alarm and alarm thresholds of one or more thermal detectors. Alarm
thresholds can be set in 1F° increments. A pre-alarm threshold can also be set anywhere within the
temperature range of 80°F to 135°F, but must be less than the detector's alarm threshold.
The alarm ranges for the thermal detectors are summarized below:
Application Pre-Alm Range (%/ft.) Alm Range (%/ft.)
In-duct 0.2 - 1.9 0.5 - 2.0
DH-2000 0.2 - 1.9 0.5 - 2.0
Spacing (ft.) Pre-Alarm Range (°F) Alarm Range (°F)
50 80 - 135 135 - 155
70 80 - 135 135 - 145
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