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Reference, Installation, and Operations Manual Section 7: Maintenance and troubleshooting
3-9000-743 Rev S June 2013
Maintenance logs and reports 281
7.6 Maintenance logs and reports
To monitor the health of the Daniel 3400 Series Gas Ultrasonic Flow Meter, and ensure it is
operating within acceptable specifications, routine diagnostics should be performed. The
results of these diagnostic checks should be trended to indicate changes from the original
installation of the meter, or over time. Looking at a single inspection report, that is either
collected monthly or quarterly, can give you an indication of the meter's health.
This is important since many diagnostics change slowly over time. Trending helps identify these
changes and makes problems much more obvious than merely viewing a single inspection
report. The Trending feature is integral to Daniel CUI (Deluxe Edition) or Daniel MeterLink which
allows all important parameters to be trended.
Also, it is recommended that a diagnostic log file be collected after an upset in the system,
where a slug of contaminants may have been introduced into the system.
In establishing a baseline to be used for the trending of the meter diagnostics, it is very helpful if
a set of log files are collected immediately after the meter has been installed in the field.
Preferably, collect the log files at several velocities within the operating range of the meter. This
helps establish that the flow profile is relatively constant throughout the meters operating
range (except velocities below 3 ft/sec where the profile may vary).
Table 7-4 Maintenance log collection
Collection rate Maximum Duration (based on 3600 records)
Best Speed n/a
5 sec. 300 min (5 hours)
10 sec 600 min (10 Hours)
30 sec. 1800 min (30 hours or 1.25 days)
1 min 3600 min (60 Hours or 2.5 days)
5 min 18000 min (300 Hours or 12.5 days)