Xylem SonTek FlowTracker2, User Manual

Page: 102 / 308

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
101
Beam Check Operation 6.3.3
Beam Check can be performed in either a small tank, bucket of water or measurement
section in canal or river such that the probe is submerged and there is a boundary
(surface, side, or bottom) within view.
a) Hold the FlowTracker2 that the boundary is located approximately 20-30 cm (8-12
in) from the probe.
b) User may need to add a small amount of fine dirt or other seeding material and
stir the bucket well for good test conditions. Regular tap water usually does not
have enough scatterers (seeding) for a valid test.
Diagnosing Measurements with Beam Check 6.3.4
Beam Check function can be used to detect measurement conditions and or hardware
related issues that can affect the measurement accuracy and precision.
Low Scattering Strength 6.3.4.1
Lack of scattering material in the water normally encountered during measurements at
springs or under ice will result in a small or non-existing sampling volume peak (see
Figure 6:4 ). In cases where there is not sufficient backscatter, place a small amount of
seeding material in the water to act as scattering material (see Seeding ).
Figure 6:4 - Low Scattering Strength
Strong Scattering Strength 6.3.4.2
Most river systems and or irrigation canals have sufficient scattering material in the water
and will result in a well-defined sampling volume peak (see
Figure 6:5 ).