Sonic Tracker and SAS Setup
P-32+ and P-32 Operator’s Manual P/ N: 1001547-01
Figure 95: ST-3 Orientation
Surface Mode is used to detect the ground or curb. While in Surface Mode, the grade indicators display up/ down
arrows and On-grade (centered) LEDs.
Figure 96: ST-3 Surface Mode LEDs
For optimal performance, make sure the ST-3 is parallel
to the surface/stringline within 5° in any direction.
Typically, the direction of travel is not critical while in Surface Mode, unless you are paving around a
ST-3 ST-3 ST-3
Lower On-Grade Raise