In-Situ TROLL 9500 Operators Manual - Manual (Page 143)

138 0095110 rev. 007 01/09 TROLL 9500 Operator’s Manual
6. Measurement interval—Auto Calculated Value: This is the
software-calculated time (seconds) for one complete exchange of
water in the calculated volume at the final pumping rate. In other
words, this is the time required to completely evacuate one volume
of the flow cell and tubing and draw in a new volume. Readings will
be taken at this interval unless you specify a different interval.
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To specify a different interval, clear the “Auto” check box as shown
above, and enter the desired measurement interval (seconds).
7. Stabilized drawdown: Final drawdown from the initial water level
entered previously (measured with tape after pumping starts). If
creating a template, estimate the final drawdown.
Click or tap Next to continue.
8. The final screen displays the available parameters. Choose the
parameters to monitor and the target stability range for each
parameter. You can enter absolute values in parameter units or
percentage values
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SECTION 20: LOW-FLOW MONITORING
TIP: If you want to enter percent values in the right column,
enter “1” as a default value in the absolute (middle) column.
The percentage range is calculated by the formula:
max - min of last 3 readings
last reading
r 100%
9. If you wish to add comments, click the Notes button. They will be
included in the output report.
10. Ensure the pump is on (unless you are creating a template), then
click or tap Start to begin the stabilization readings.
The sidebar on page 139 describes the stabilization readings
screen that is shown next.
11. When the readings appear stable, you are ready to save the data
and exit the software. Click or tap Accept.
If creating a template, let the stabilization phase run for at least
one reading, then click Accept.
SAVING THE LOW -FLOW DATA OR TEMPLATE
Click Save when a suggested output file name is displayed. You may
change this name if you like. After it is saved, the file will be displayed
in the Data Folder branch of the Navigation tree and will open in
the Information pane, like other test files extracted in Win-Situ 4 or
Pocket-Situ 4.
The file may be displayed in report format or as a graph in both Win-
Situ 4 and Pocket-Situ 4. (If you can’t see much on the PDA screen,
try scrolling to the right.) The top of the file presents well, site, and
project information. At the end of the file are the measurement data.
Additional functions are available through Win-Situ 4.
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graphical report output is available if you export to Excel.
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