SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
46
a) The sound speed value used in Doppler velocity calculations is based on internal
calculations by default. The sound speed field will be populated with the value
“Calculated” to indicate it is based internal calculations.
b) Sound Speed measured by external devices can be entered in the sound speed
field. The sound speed value from the external sensor will then be used in
Doppler velocity calculations.
Where a measurement location exceeds the PSS-78 range, Salinity cannot be used for
calculation of Sound Speed. Sound Velocimeters must be used to measure the actual
sound speed of the water directly at the measurement location.
The sound speed field cannot be used to store reference sound speed readings as this
will be used in the Doppler velocity calculations. It is recommended that reference
sound speed readings be documented in the comments fields.
c) Sound speed is used in Doppler velocity calculations. See Principle of Operations
for details about the effect of sound speed on velocity data.
d) Enter external Sound Speed reading,
i). If the default value “Calculated” is displayed, start typing using keypad, otherwise,
ii). Use the backspace key to clear current entry,
iii). Type in the new value using the keypad.
Mounting Correction 3.4.2.5
The Mounting Correction parameter specifies how to account for the device used to
hold the FlowTracker2 in the water. The type of mount may have a small impact on
velocity measurements.
a) The mounting correction allows the FlowTracker2 to account for the effect of flow
disturbances caused by the mount.
b) The default mounting correction applied in FlowTracker2 is 0%.
c) The application of a mounting correction to account for the effects of flow
disturbance on velocity measurements was researched by several independent
agencies. At present, no consensus has been reached between different
agencies in the requirement of the mounting correction. See Mounting Correction
for details about the effect of flow disturbance on velocity measurements.
d) To change the Mounting Correction,
i). Use the backspace key to clear current entry,
ii). Type in the new value using the keypad.
Quality Control Settings 3.4.3
The Quality Control Settings function contains parameters required for the Quality
Control process.
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