Emerson Rosemount 3814 Maintenance And Troubleshooting Manual page 27

Maintenance and Troubleshooting Manual
00809-0100-3814
Table 2-2: Maintenance
MeterLink utility
Meter Monitor (Detailed)
view
Rosemount 3814 Liquid Ultrasonic Flow Meter
(continued)
Diagnostics
Flow Profile
Troubleshooting
January 2023
Action(s)
• Flow profile ratios can be
viewed by clicking on the
arrows in the upper left
of the chart.
• The flow profile ratios
for chords A and D and
chords B and C should be
equal lengths.
• The flow velocity ratio
between chords A & D or
chords B & C should not
differ by more than 10%,
changes will be reflected
by the symmetry and
flow profile values.
• If the difference persists,
the flow conditioner
(if installed) should be
checked for blockages
and if required the
upstream piping should
be cleaned.
• Per path Speed of Sound
(SOS) differences should
not be more than .35%,
these can be viewed by
clicking on the arrows
in the upper left of the
chart. Negative values
are shown in blue.
• The SOS difference can
be caused by buildup
on the transducer,
incorrect geometrical
and delay time values
and stratification at
lower velocities.
• Gains and Signal to
Noise Ratios (SNR) are
displayed in decibels and
should be compared to
the initial values in the
maintenance logs taken
during the calibration or
initial start-up.
• The average chord
signal amplitudes should
be compared to the
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