Xylem SonTek FlowTracker2, User Manual

Page: 136 / 308

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
135
g) Battery.
h) To select a variable,
i). Use the up or down arrow key to view a
variable.
i) To accept the velocity measurement,
i). Press the Right Soft Key.
j) To REDO velocity measurement,
i). Press the Left Soft Key.
The conventions and graphic display features used for displaying Velocity and SNR raw
data are defined under
Raw Data Display .
Properties associated with the variable output from the numerical calculations
performed on raw data collected is defined in Table 8:8 ,
Table 8-8 - Review Point Measurement
Variable Description Units Decimal
Samples Total number of samples received. number n/a
Spikes Number of spikes removed from mean velocity. number n/a
Vel
Mean X velocity component of all samples.
Velocity is despiked and mounting correction
applied (if applicable).
m/s or ft/s 4
σV
Standard error of X velocity component. m/s or ft/s 4
SNR
Mean signal to noise ratio. Average of beam 1
and 2 SNR during point measurement.
dB 3
Angle
Flow angle relative to X direction. Angle
between the mean X velocity component and
mean Y velocity component.
Degree 2
Tilt
Mean wading rod angle during point velocity
measurement.
Degree 2
Temp Mean temperature during point measurement. °C or °F 2
Bnd Boundary QC value. n/a n/a
Review Station Measurement 8.3.3.4
Review Station measurement screen consist of tabular report and velocity distribution
plot supplied at the completion of all point velocity measurements at a station. The
variables supplied in the report are dependent on the features activated on the handheld,
velocity method selected and the discharge calculation method. The velocity distribution
plot gives graphical presentation of the point velocity measurements against theoretical
1/6
th
power law.