30 Operations Manual
4D smoke/heat detectors. A 3D detector contains a combination of
photoelectric and heat sensors. A 4D detector contains a
combination of ionization, photoelectric, and heat sensors.
• The Alarm Threshold is expressed in terms of percent smoke
obscuration per foot.
SIGA-IS (Ion Detector)
Sensitivity Value
(% obscuration/ft)
Sensitivity Level
0.7 1 (Most Sensitive)
1.0 2 (More Sensitive)
1.2 3 (Normal)
1.4 4 (Less Sensitive)
1.6 5 (Least Sensitive)
SIGA-PS (Photo Detector), SIGA-PHS (3D Detector), SIGA-IPHS
(4D Detector)
Sensitivity Value
(% obscuration/ft)
Sensitivity Level
1.0 1 (Most Sensitive)
2.0 2 (More Sensitive)
2.5 3 (Normal)
3.0 4 (Less Sensitive)
3.5 5 (Least Sensitive)
• The Maintenance Indicator is a numerical value between 1 and 100.
A maintenance indicator of 80 or above indicates that the detector
requires cleaning.
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