In-Situ Win-Situ 2000 Operators Manual - Manual (Page 24)

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SECTION 5: PRESSURE PARAMETER SETUP
Level Reference
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 immediately 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.