Programming instructions
QS4 Technical Reference Manual 4.17
Table 4-5: %Obscuration levels for SIGA–IPHS, SIGA–PS, and SIGA–PHS
Alarm Obscuration Levels
Sensitivity Settings
Most More Normal Less Least
%Obscuration
1.00% 2.00% 2.50% 3.00% 3.50%
Prealarm Settings Prealarm Obscuration Levels
95% 0.95% 1.90% 2.38% 2.85% 3.33%
90% 0.90% 1.80% 2.25% 2.70% 3.15%
85% 0.85% 1.70% 2.13% 2.55% 2.98%
80% 0.80% 1.60% 2.00% 2.40% 2.80%
75% 0.75% 1.50% 1.88% 2.25% 2.63%
70% 0.70% 1.40% 1.75% 2.10% 2.45%
65% 0.65% 1.30% 1.63% 1.95% 2.28%
60% 0.60% 1.20% 1.50% 1.80% 2.10%
55% 0.55% 1.10% 1.38% 1.65% 1.93%
50% 0.50% 1.00% 1.25% 1.50% 1.75%
45% 0.45% 0.90% 1.13% 1.35% 1.58%
40% 0.40% 0.80% 1.00% 1.20% 1.40%
35% 0.35% 0.70% 0.88% 1.05% 1.23%
30% 0.30% 0.60% 0.75% 0.90% 1.05%
25% 0.25% 0.50% 0.13% 0.31% 0.88%
20% 0.20% 0.40% 0.50% 0.60% 0.70%
15% 0.15% 0.30% 0.38% 0.45% 0.53%
10% 0.10 0.20% 0.25% 0.30% 0.35%
5% 0.05 0.10% 0.13% 0.15% 0.18%
Note: Shaded prealarm settings not available for SIGA–IPHS
Table 4-6: %Obscuration levels for SIGA–IS
Alarm Obscuration Levels
Sensitivity Settings
Most More Normal Less Least
%Obscuration
0.7% 1.00% 1.20% 1.40% 1.6%
Prealarm Settings Prealarm Obscuration Levels
95% 0.67% 0.95% 1.14% 1.33% 1.52%
90% 0.63% 0.90% 1.08% 1.26% 1.44%
85% 0.60% 0.85% 1.02% 1.19% 1.36%
80% 0.56% 0.80% 0.96% 1.12% 1.28%
75% 0.53% 0.75% 0.90% 1.05% 1.20%
70% 0.49% 0.70% 0.84% 0.98% 1.12%
65% 0.46% 0.65% 0.78% 0.91% 1.04%
60% 0.42% 0.60% 0.72% 0.84% 0.96%
55% 0.39% 0.55% 0.66% 0.77% 0.88%
50% 0.35% 0.50% 0.60% 0.70% 0.80%
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