Configuration and Programming
February 2012 3-20 P/N 06-237058-001
FOOTNOTES (Figure 3-20:
7 Fixed Settings. Change an Ionization Detector’s Pre-Alarm and Alarm Thresholds.
Purpose: To change the pre-alarm and alarm thresholds of one or more ionization 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 0.5 to 1.4 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:
Ionization 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.
Note: To install in Canada, and comply with ULC-S529-02 requirements:
1. The obscuration range of Smoke Detector Model CPD-7052 is 0.6% per foot or less.
2. The obscuration range of Smoke Detector Model PSD-7152 is 3.5% per foot or less.
Application Pre-Alarm/Alarm Range (%/foot)
Induct 0.5 - 1.0
DH-2000 0.5 - 1.0
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