Xylem SonTek FlowTracker2, User Manual

Page: 39 / 308

SonTek – a Xylem brand
FlowTracker2 User’s Manual (January 2019)
38
ii). Press the Left Soft Key to return to Configuration for the software to accept the
change.
Use Pressure Sensor (Pressure Sensor) 3.2.6
The Use Pressure Sensor function allows the operator to enable the internal pressure
sensor for depth measurements in both Discharge and General data collection modes.
Pressure sensor functions and associated software features are only available for
FlowTracker2 ADV probes equipped with an internal pressure sensor.
Probe Offset From WR Bottom (Pressure Sensor) 3.2.7
The Probe Offset From WR Bottom functions allows the operator to enter an offset
between the bottom of the ADV Probe and the wading rod base plate.
The ability to align the bottom of ADV Probe
with the wading rod base plate will not be
feasible for most wading rod designs. The
Probe Offset From WR Bottom accounts for the
difference between the bottom of ADV Probe
and the wading rod base plate in the depth
measurements.
Figure 3:4 – Probe Offset
From WR Bottom
It’s recommended that the offset selected
should exceed the average size of obstacles on
the channel bed. If a two point method is
performed during a measurement it is
recommended that the offset should be equal to
the average of all the 0.8 measurements to
reduce adjustment time.
The user can make use of the top setting rod vernier scale to reference the offset.
Example, if the graduation mark ‘
1 ’ on the suspension rod is opposite the graduation “ 0 ”
on the Vernier scale, it represents a 0.068 m (0.22 ft) offset.
Air Pressure Cal. Period (min) (Pressure Sensor) 3.2.8
The FlowTracker2 ADV internal pressure sensor can be calibrated against atmospheric
pressure during any stage of the measurement. The
Air Pressure Cal. Period (min)
function allows the operator to set a time limit between atmospheric pressure
calibrations.
Properties associated with the Air Pressure Cal. Period are defined in
Table 3:6
,
Table 3-6 - Air Pressure Cal. Period - Properties
Parameter Min Max Default Units Required
Air Pressure Cal. 5 60 10 minutes Yes
Probe Offset