LaserNET Program User's Guide
September 2003
TM0048
6-7
6-5.2
Smoke Alarms
The thresholds for the alarm levels, the time delays associated with these alarm levels and the day/night
option are configured in this paragraph.
1. Select
Options>Configure>Smoke Alarms
. The Smoke Alarms window (Figure 6-8) shows the cur-
rent settings.
Figure 6-8. Smoke Alarms Window for a Direct Connection and IIM
6-5.2.1
DAY SMOKE THRESHOLDS
Day Smoke Thresholds are entered in the Alarm 2, Alarm 1, Pre-Alarm 2 and Pre-Alarm 1 boxes (Direct
Connection and IIM). The following rules apply to setting these thresholds:
The thresholds can be set from 10% to 100% of full scale, in increments of 5%.
Two thresholds can be set to the same level.
For Direct Connection or IIM, Alarm 2 cannot be set below Alarm 1, and Pre-Alarm 2 cannot be set
below Pre-Alarm 1.
The window will display the factory default, or other programmed settings when opened. To change the
settings:
1. Select the Day Threshold field in the Alarm 2 or Pre-Alarm 2 or Pre-Alarm 1 box. Enter the new value.
2. Repeat this step for all alarm(s).
3. Select
<OK>
to save the configuration.
6-5.2.2
NIGHT SMOKE THRESHOLDS
Night smoke thresholds only need to be set if the day/night option is selected. If this option is not used, the
values in these boxes will be ignored. Skip to the paragraph on Alarm Time Delay Options (Paragraph
6-5.2.3).
If the day/night option is used, values for the night smoke thresholds are entered following the same proce-
dure as in Paragraph 6-5.2.1, except selecting the appropriate Night Threshold fields.
6-5.2.3
ALARM TIME-DELAY OPTION
This option prevents transient conditions from causing unwanted alarms. When programmed, each alarm
level will activate when the smoke level reaches its threshold and the programmed delay is satisfied. The
following conditions apply:
The smoke-level bar graph on the display and control graphic will accurately reflect the real-time smoke
level throughout the delay period.
The alarm indicators on the display and control graphic will not light until the delay is satisfied.
If the smoke level drops below the threshold during the delay period, the delay time will be reset.
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