Panametrics PanaFlow XMT1000, User Manual, Page: 29 / 80

3.1.3 Flow error string
Flow errors are errors detected by the Flow PCB in the course of making a flow measurement. These errors can be caused by
disturbances in the fluid, such as excessive particles in the flow stream or extreme temperature gradients. The errors could
also be caused by an empty pipe or other such issue with the fluid itself. Flow errors are typically not caused by a malfunction
of the flow measurement device, but by an issue with the fluid itself.
Note: For troubleshooting tips, see “diagnostics.”
Table 4: Flow error string
Error code Error message Description
E1: SNR The signal to noise ratio is low.
The acoustic signal from the process is very low. This
could be due to bubbles, other fluid conditions, an empty
pipe, broken cables, transducers, couplant or buffers.
E2: Soundspeed
The measured soundspeed
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.
E3: Velocity range
The measured velocity
exceeds programmed limits.
This error may be caused by incorrect programming, poor flow
conditions and/or excessive turbulence.
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 .
E5: Amplitude
The signal amplitude exceeds
the programmed limits.
This error may occur due to high signal attenuation or
amplification due to changes in fluid properties, or
transducer/buffer/couplant issues.
E6: Cycle skip
A cycle skip is detected while
processing the signal for
measurement.
This is usually due to poor signal integrity, possibly because
of bubbles in the pipeline, sound absorption by very viscous
fluids, or cavitation.
E15: Active tw
The active tw measurement
is invalid.
A transducer or cable is damaged, or a transducer needs to be
re-coupled. This may also be due to incorrect programming, or
extreme process temperatures.
E22: Single channel
accuracy
One of the measurement
channels is in error.
One measurement channel is in error; accuracy of the
measurement may be compromised because the meter
might be using a sister chord substitution.
E23:
Multi channel
accuracy
Two or more measurement
channels are in error.
Two or more measurement channels are in error; accuracy
of the measurement may be compromised because the
meter is using a sister chord substitution.
E28: Software fault There is a software malfunction
This is a software malfunction. Try power cycling the
meter. If the error persists after power cycle, contact
Panametrics factory.
E29:
Velocity
warning
The measured velocity exceeds
programmed warning limits.
This error may be caused by incorrect programming, poor
flow conditions and/or excessive turbulence.
E31: Not calibrated
The flow meter has not been
calibrated.
The flow meter has not been calibrated and hence is not
making measurements.
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