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3.4.3.2
Std Error Threshold
The Standard Error Threshold parameter is a maximum threshold placed on the
Standard Error of velocity measurements.
a) Standard error of velocity (
velocity data.
b) The default Standard Error Threshold applied in FlowTracker2 is 0.01m/s.
c) To change the Standard Error Threshold,
i). Use the backspace key to clear current entry,
ii). Type in the new value using the keypad.
d) To
DISABLE
i). Use the backspace key to clear current entry until "Disabled" is displayed.
3.4.3.3
Spike Threshold
The Spike Threshold parameter is the maximum threshold placed on the percentage of
spikes within a measurement.
a) Spikes in velocity data occur with any acoustic Doppler velocity sensor such as
the FlowTracker. Spikes may have a variety of causes – large particles, air
bubbles, or acoustic anomalies.
b) The default Spike Threshold applied in FlowTracker2 is 10%.
c) To change the Spikes Threshold,
i). Use the backspace key to clear current entry,
ii). Type in the new value using the keypad.
d) To
DISABLE
i). Use the backspace key to clear current entry until "Disabled" is displayed.
3.4.3.4
Velocity Angle for Warning
The Velocity Angle for Warning parameter is the maximum threshold placed on the
velocity angle towards the probe.
a) An angle of 0° means flow direction is perpendicular to the tag line (as desired for
an ideal measurement location).
b) The default Velocity Angle for Warning applied in FlowTracker2 is 20 degrees.
c) To change the Velocity Angle for Warning,
i). Use the backspace key to clear current entry,
ii). Type in the new value using the keypad.
d) To
DISABLE
i). Use the backspace key to clear current entry until "Disabled" is displayed.
FlowTracker2 User's Manual (January 2019)
σV
) is a direct measure of the accuracy of the mean
the Standard Error Threshold,
the Spikes Threshold,
the Velocity Angle for Warning,
48
SonTek – a Xylem brand
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