Table 2-2: Maintenance (continued)
Daniel MeterLink utility Diagnostics Action(s)
Meter Monitor (Detailed) view • Flow Profile • Flow profile velocity for
meters with four Chordal
paths - Chords A and D
shown on the Bar graph
should be of equal lengths
and at 5 ft/s should be 0.89
and Chords B and C should
be 1.0 indicating a good
flow profile.
• If the velocity range is
greater than a 10%
differential between
chords, a degradation in the
symmetry is indicated by a
change in the flow velocity
for the chord and the
measured SOS. A chord
that causes the spread for
the Speed of Sound to vary
more than 0.35% of the
Average Speed of Sound,
the bar for that chord turns
yellow.
• Clicking one of the arrows
at the top left of the graph
will change the chart to SOS
Differences from the
average meter speed of
sound. This provides a quick
indication on how much
spread in speed of sound is
between the chords.
Negative values are shown
in blue.
• Compare Gains and Signal
to Noise (SNR) ratios
decibel values with the
values in the Maintenance
log Inspection report from
the meter flow calibration.
• Check chord average signal
amplitudes with the meter
baseline values in the
Maintenance log Inspection
report.
• The meter may not be in
measurement mode or
there are too few operating
chords.
Troubleshooting Maintenance and Troubleshooting manual
June 2019 P/N 3-9000-769
38 Gas Ultrasonic Flow Meters
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