Configuration and Programming
P/N 06-237041-001 3-19 February 2011
FOOTNOTES (Figure 3-19):
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. The
photoelectric detector is UL Listed and FM Approved for alarm reporting anywhere within the
obscuration range of 0.5 to 3.5 percent per foot when used for an open-area application. 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. The
thermal detector is UL Listed and FM Approved for alarm reporting anywhere in the range of 135° F
to 155°F when used with a 50-foot spacing, or anywhere in the range of 135°F to 145°F when used
with a 70-foot spacing. 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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