TotalFlow uFLO, User Manual

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4-3
Maintenance
Backing up Configuration Files
Before you begin any maintenance on your
µ
FLO, you should collect the data and back up all
configuration files to your laptop's hard drive or a floppy disk. This safeguards your data and allows you
to re-start the unit without the hassle of re-configuring the
µ
FLO should any problem arise.
Although there are “Save” buttons in the Entry Mode screens which allows the user to backup “Entry”
mode data items, a complete system backup is only accomplished by using the “Save and Restore
Utility”. When using this utility to backup files, the user should also download the files to the S: drive in
case of a “Cold” start.
•
While in PCCU, use the Save and Restore Utility found under File Utilities in the Operate drop
down menu.
Changing
µ
FLO Clock
When any measurement applications are instantiated on the
µ
FLO, changing the clock could affect the
time when log period entries are made. To protect integrity of accounting audit trails, the
µ
FLO handles
these types of clock changes as follows:
Clock Change
Not Crossing an
Hour Boundary:
When next log period entry is made, clock is not altered.
Example: If present time is 4:15 p.m. and clock is changed to 4:05 p.m. of the
same day, the daily flow record is the same. Entry reflects averages accumulated
over a 70 minute time period (15 minutes plus 55 minutes).
Forward Clock
Change
Crossing an
Hourly
Boundary: Forces an log period entry for part of hour that has accumulated since last hourly
entry.
µ
FLO then advances to newly defined data flow record boundary and begins
maintaining balance of days' data in newly defined boundary.
Example: If present time is 4:55 p.m. and clock is changed to 5:05 p.m. of the
same day, the entry reflects only a 55 minute average accumulation. Then a new
flow record is written and this period is also based on a 55 minute accumulation.
Backward Clock
Change
Crossing an
Hourly
Boundary:
Hourly entry is made for part of the hour that has accumulated since the last hourly
entry. This is same as for a Forward Clock Change Crossing an Hourly Boundary.
µ
FLO advances to a new day’s data flow record and maintains balance of day’s
data in new record.
Example: If present time is 5:05 p.m. and clock is changed to 4:55 p.m. of the
same day, the log period record entry reflects only a 5 minute average
accumulation. Then a new flow record is written and this log period is based on a
60 minute accumulation.
A backward clock change uses two (2) records to maintain data integrity. This
assures that previously recorded data is not overwritten.
If it is necessary to make small backward time changes, less than one (1) hour,
user should wait until current hour has progressed far enough to make change that
does not cross an hour boundary.