Technical data

Microsoft Excel
®
Raw data report
Figure 5-10:
5.5 Collecting trend maintenance logs
The Trend Maintenance Logs dialog box allows you to merge two or more Maintenance
logs together into a single Trend file in order to build a historical database of the
performance of ultrasonic meters.
Maintenance logs can also be merged with existing Trend files to form a new Trend file of
the combined data. The Trend feature can be useful to see how the meter performance
changes with changing flow conditions over time. It can also be useful to detect
performance issues when the meter performance is deteriorating slowly over time but the
flow conditions have not changed in a manner to account for it.
Note
Maintenance logs or Trend files to be trended must all have matching column headings. This means
the logs must be in the same units (i.e. U.S. Customary or Metric), must have the same pressure type
(i.e. gage or absolute), and must have the same time base (1/sec, 1/min, 1/hr, 1/day). If not, an error
message will be displayed stating the column headings do not match and the file will not be added to
the Workbook to trend list.
Archive logs and reports
Operations 91