7-3
September 2003
TM0048
LaserNET
Program User's Guide
7-1.3
Using the Smoke History Window
Several features are available for viewing the smoke history once it has been downloaded. The history
graph is divided into equal segments with the date and time shown beneath each division on the horizontal
axis and obscuration percentages given for the vertical axis.
7-1.3.1
ZOOMING
To zoom in on specific sections of the graph:
1. Place the cursor over one end of the range to be enlarged. The Cursor Position box will show the date,
time and smoke level for the point beneath the cursor.
2. While holding down the left mouse button, move the cursor to the other end of the range, using the
Cursor Position box as a guide if necessary. A rectangle will outline the range to be enlarged.
3. Select the Scroll Left and Scroll Right buttons (Figure 7-4 and 7-5) to view the history to the left or right
of the displayed data.
Figure 7-4. Scroll Left Button
Figure 7-5. Scroll Right Button
4. To zoom out to the full graph, click on the right mouse button.
7-1.3.2
ALARM LEVELS
To superimpose the programmed alarm levels over the smoke history curve:
1. Select the Display Alarm Levels button, or select
Options>Alarm Levels
from the menu. The pro-
grammed alarm levels are shown.
Figure 7-6. Display Alarm Levels Button
2. The alarm levels are superimposed over the graph in dotted red lines. For a Direct Connection or IIM,
there will be three such lines labelled Alarm 1, Pre-Alarm 2 and Pre-Alarm 1.
Figure 7-7. Smoke History Window Showing Smoke Data and Alarm Levels
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