In-Situ Level TROLL 400/500/700/700H Operators Manual - Manual (Page 54)

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New Reference—This option is designed to be used with an active software
connection when the device is installed in the water.
A new level reference must be entered while the
device's pressure sensor is submerged in its final
position in the water.
This is because the current probe
reading is set equal to the Level Reference to create the offset
that takes effect at the start of the data log. The log header will
show the probe reading at the time you entered the Level
Reference.
During log setup, the software presents two additional options for entering the Level
Reference:
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Set first logged reading—Use this option when the instrument will be deployed
on wire rather than cable because you will not be able to communicate with the
instrument when it is submerged.
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Remind me to set reference later—Use this option to defer the entry of the
Level Reference during log setup and set a reminder to enter it when the device is
submerged in its final position.
Starting a Log
Every log is programmed for either a manual or a scheduled start. A log with a manual
start time is displayed in the Logging screen with Ready in the Status column. A log
with a scheduled start time is displayed with Pending in the Status column.
Starting a Pending Log
A Pending log automatically starts at the scheduled time without any user intervention.
A scheduled log with Pending status can be manually started at
any time before its scheduled start.
Starting a Manual Log
With the instrument connected to the software, select the Logging tab.
Select the Ready log you want to start.
Click the Start Log button . The log starts and the symbol changes. The Status
column displays Running.
Suspending (Pausing) a Log
A running log may be temporarily paused. For example, you might want to reposition an
instrument, calibrate a sensor, or clean a sensor and later resume the log. A log can be
suspended and resumed three times.