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Sonic Tracker and SAS Setup
Sonic Tracker Placement
47
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
Placement When Using a Mechanical Ski
If using a mechanical ski with an elevated string or wire, make sure the string/ wire reference is a minimum of
4 inches above the ski (Figure 81). When paving with a mechanical ski through super elevations, the ski tends
to pull away from the paver and may even tip to one side. Elevating the string at least 4 inches ensures that
the ski stays out of the working window.
Also, remember to place the Tracker in the center of the ski to maximize the averaging length. I f using a 30 foot
ski, place the sensor 15 feet from the end of the ski. For every 1 foot positioning error from the center of the
ski, you lose 2 feet of effectivity of the ski. For example, if the sensor is moved foreword or backward 2½ feet
(12½ feet from the end) you are using a 25 foot ski.
Figure 81: Tracker & Mechanical Ski Placement
Placement When Using Elevated Stringline
Some jobs may require the mat be laid to a specified elevation. I n an application like this, an elevated stringline
or wire may be set up. The Sonic Tracker has a built in working window that prevents the screed from diving if
the tracker loses the stringline reference. Position the tracker over the stringline and set the distance between
18 and 24 inches (Figure 82).
Figure 82: Tracker Position – Mat laid at Specific Elevation
Min.
4"
String or Wire
Min. of 4" Above Ski
C
L
15'
30'
Min.
4"
Sonic Tracker II
String or Wire
Min. of 4" Above Ski
C
L
15'
30'
ST-3 Sonic Tracker II
Sonic Tracke r II
T
18"
to
24"
Sonic Tracke r II
Sonic Tracke r II
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