SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
103
The Beam Check supplied in Figure 6:8 indicates that boundary was detected at 30cm
away from the transducer.
Figure 6:8 - Boundary Detected - 20cm
Boundary that is located within 27cm from the FlowTracker2 transducer can affect the
accuracy and precision of velocity measurement. It is recommended when working
close to boundaries to determine the location of the boundary in relation to the
transducer and sampling volume. This can be achieved by performing a manual Beam
Check or Automated Beam Check.
Boundary in Sampling Volume 6.3.4.4
Boundary in Sampling Volume occurs when the boundary is located at the same position
from the transducer than the sampling volume. There are number of unique features
shown in Figure 6:9 that can be used to identify if boundary is located within the
sampling volume.
a) The SNR of the peak located at the sampling volume is two to three times higher
than previous measurements performed.
b) Three peaks are displayed in the Beam Check, spaced at equal distances.
c) The SNR of each peak reduces as distance increase form the transducer.
Figure 6:9 - Boundary within Sampling Volume
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