Emerson Rosemount 3812 Maintenance And Troubleshooting Manual page 9

Maintenance and Troubleshooting Manual
00809-0100-3812
Figure 1-2: Trend log collection
This is important since many diagnostics change slowly over time. Trending the
maintenance logs helps identify these changes and makes problems much more obvious
than merely viewing a single inspection report. The Trending feature is integral to
MeterLink which allows all important parameters to be trended. MeterLink supports
trending files in a Microsoft
logs. Some parameters like gain, signal level, and noise level may show a shift over time
which can be useful in detecting changes in the meter and the installation.
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. gauge or absolute), and must have the same time base (1/
second, 1/minute, 1/hour, 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 log collection
Archive logs that may be collected and the options include:
• Daily log - generated every 24 hours on the Contract Hour
• Hourly log - generated every hour at the top of the hour
• Event log - collects the alarm and event log records
Rosemount 3812 Liquid Ultrasonic Flow Meter
® ®
Excel workbook from multiple 3812 meter maintenance
Routine Maintenance
April 2022
9