Table 21: Flow error description and recommended actions
Error Code
Problem
Cause
Recommended Action
E1: SNR
The Signal to Noise ratio is low
The acoustic signal from the
process is very weak. This
could be due to bubbles,
other fluid conditions, an
empty pipe, broken cables,
transducers, couplant or
buffers
Check if the Active Tw
measurement on upstream
and downstream transducers is
valid. If Active Tw measurement
is valid then this error is an
indication of the problem with
the process conditions.
If Active Tw measurement is
not valid then check the value
entered in SNR Min Error Limits
option (Refer Programming
Chapter). Also, refer to “Fluid
and Pipe Problems” and
“Transducer Problems” sections
to correct for any issues
E2: Soundspeed
The measured sound speed
exceeds programmed limits
The error may be caused
by incorrect programming,
poor flow conditions or poor
transducer orientation. It
may also occur if signal
quality is poor
Compare the measured sound
speed to programmed nominal
values for the process fluid
and correct any programming
errors. Refer to “Fluid and Pipe
Problems” and “Transducer
Problems” sections to correct
for any issues. In case you
are unable to clear the errors,
gather the required diagnostics
before contacting Panametrics
E3: Velocity Range
The measured velocity
exceeds programmed limits
This error may be caused
by incorrect programming,
poor flow conditions and/or
excessive turbulence
Make sure the actual flow rate
is within the programmed Error
limits (Refer Programming
Chapter). Refer to “Fluid and
Pipe Problems” and “Transducer
Problems” sections to correct
any issues
E4: Signal Quality
The signal quality is lower
than the programmed limits
This means the signal shape,
upstream to downstream
reciprocity, or signal
correlation value has fallen
below the correlation peak
limit. The cause is usually the
same as E6 or E5
Make sure the Signal Quality is
greater than the programmed
Error limits (Refer Programming
Chapter). Refer to “Fluid and
Pipe Problems” and “Transducer
Problems” sections to correct
any issues. Gather required
diagnostics data before
contacting Panametrics
55
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