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Sonic Tracker and SAS Setup
Sonic Tracker II Specifics
58
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
ST-3 Orientation
Figure 101: ST-3 Orientation
Sonic Tracker II Specifics
Whether setting up a standard Sonic Tracker I I system or a Smoothtrac SAS using the Sonic Tracker II , consider
the following for each Tracker:
The Tracker has a total working range of 14 inches to 55 inches—41 inches of adjustment—allowing the
Tracker to be set over a stringline on one pass, then match grade on the next pass without moving the
tracker.
Therefore, the job application determines the position of the Tracker. For example, when using a
stringline reference, keep the Tracker about two feet above the string, giving the operator about six
inches of lateral movement to keep the Tracker over the string. When tracking a curb, lower the
Tracker to keep it over the lip of the curb, preventing the Tracker from “seeing” the top, or face, of the
curb.
When setting up the Tracker over a grade reference, consider the size of the Sonic Cone, or the
“footprint”. For example, at about two feet from the Tracker, the footprint, or cone, will be about six
inches.
The Tracker compensates for temperature changes only within the bail range. Placing the Tracker too far
from the reference may cause inaccurate temperature compensation.
Temperature and atmospheric conditions affect the speed of sound. I n paving applications, the air
temperature can change rapidly and dramatically. A temperature bail attached to the tracker
compensates for these variations. I f the jobsite has high winds and/ or large temperature fluctuations,
lower the Tracker closer to the reference.
The following sections detail the positioning tracker in relation to the grade reference, as well as on the machine.
For optimal performance, make sure the ST-3 is parallel
to the surface/stringline within 5° in any direction.
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