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PanaFlow HT User’s Manual
77
Chapter 4. Error Codes and Troubleshooting
E15
ActiveTw
E15 indicates an error with the active Tw
measurement. This may be caused by a transducer
error, a parameter programming error, or extreme
process temperatures. The error means that the
measurement of how long it is taking the ultrasonic
signal to pass through the bundled waveguide is
outside reasonable limits.
E6
CycleSkip
E6 indicates that a cycle skip has occurred in the
signal processing measurement. This is usually due to
poor signal integrity, possibly because of bubbles in
the pipeline, sound absorption by very viscous fluids,
or cavitation.
E5
Amplitude
E5 indicates an amplitude error in the signal
processing measurement. The signal amplitude is
either excessively high or low. This is also due to poor
signal integrity, much like an E6 error.
E4
SignalQuality
E4 indicates a Signal Quality error. This means the
signal shape, upstream to downstream reciprocity, or
signal correlation value is poor. The cause is usually
the same as E6 or E5.
E3
VelocityRange
E3 is a velocity range error, meaning that the
calculated velocity is outside the velocity limits
defined for this application. The velocity we are
measuring is not reasonable for the fluid and pipe size
programmed in the data set. This could be a
programming error, a poor signal, or an actual flow
condition that is unexpectedly high in the positive or
negative direction.
E2
SoundSpeed
E2 is a sound speed error. One benefit of ultrasonic
flow measurement is that the process can determine
the sound speed of the fluid. If this sound speed is
beyond the limits set for the programmed application,
an E2 error is set. This can alert the operator that the
wrong fluid is in the pipe, or that the program
parameters are out of date. It may also occur if signal
quality is poor.
E1
SNR
E1 indicates a low signal to noise ratio (SNR). This
means the flowmeter is not getting very much acoustic
signal from the process. This could be due to bubbles
or other fluid conditions, an empty pipe, or other
possible causes that are listed in the Diagnostics
section.
Table 5: Flow Error String (cont.)
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