Chapter 6
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6-1
Tracker and SAS
Placement
Whether setting up a standard Sonic Tracker II system or a
Smoothtrac SAS, 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. In paving applications, the air temperature can change
rapidly and dramatically. A temperature bail attached to the
tracker compensates for these variations. If the jobsite has high
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