In-Situ Win-Situ 4 / Pocket-Situ 4 Operators Manual - Manual (Page 37)

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0031510 rev. 003 11/04
LEVEL REFERENCE
This is a user-specified starting point for level display modes. Here are
some examples:
• Surface: Calculate the water level above mean sea level (MSL) and
enter as the Level Reference. Data will be displayed as elevations
above MSL.
• TOC: Measure the distance to the water surface from the top of the
well casing (DTW) and enter as the Level Reference. Data will be
displayed as DTW values.
• A Level Reference of 0 is equivalent to “zeroing” the probe. Data will
be displayed as changes from the starting water level.
A current reading of the sensor depth is displayed in this screen; you can
reposition the probe and update the reading with the Update Reading
button.
Reference Time
The device takes a “snapshot” of the sensor’s raw pressure reading, then
your Level Reference is substituted. You can specify that the snapshot be
taken now or when the test starts. The data file will show the Reference
(raw pressure) Reading and when it was taken.
• Now: the pressure is measured when you click Finish, and the value is
stored until the test starts. All measurements taken during the test will
be relative to the water level at the time you finished the wizard.
• Start of Test: the Reference measurement will be taken at time t=0. All
measurements taken during the test will be relative to the water level at
the moment the test starts.
TIP: To display
“manual” readings
that take your
Level Reference into
account, select Reference
Time: Now.
SECTION 5: PRESSURE SETUP