Xylem WQL-pH pH DATALOGGERS User Manual
Page 65
WQL-pH
Maintenance, cleaning, storage
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10/2009
Data preservation
After the battery was removed all stored measured values are retained. Only
the date and time are reset to the default condition (01.01.2008, 00:00) when
the power supply is interrupted.
We recommend to connect the logger to the PC for the time of the battery
replacing process so the logger is supplied with power via the USB
connection while there is no battery inserted. Thus the date and time will be
retained. Otherwise, the date and time will be set the next time the logger is
connected to the PC with the WQL-Log PC program. Depending on the
setting in the WQL-Log program, this is either done automatically when the
connection is established (synchronization with the system time of the PC),
or manually.
State of the logger after the power supply was interrupted (battery empty or
removed, see also section 7.4 S
Case 1: Logging
job active at the
time of
interruption
z
The logging job is terminated.
z
The time is reset to the default condition.
z
All data logged up to this point of time are retained and are automatically
saved on the PC the next time the logger is connected to the PC.
z
The terminated logging job can be continued with a corresponding new
logging job. To do so, the time must be set anew if the automatic time
synchronization is switched off.
Case 2: No logging
job at the time of
interruption
z
The time is reset to the default condition.
z
Prior to setting up the next logging job, you have to set the time if the
automatic time synchronization is switched off.
Case 3: Battery
removed for
storage
z
The time is reset to the default condition.
z
Prior to setting up the next logging job, you have to set the time if the
automatic time synchronization is switched off.