Flexim FLUXUS F401, Руководство по эксплуатации

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10 Troubleshooting
FLUXUS F401 10.1 Problems with the measurement
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UMFLUXUS_F401V2-1EN, 2020-06-12
10.1 Problems with the measurement
A measurement is not possible because no signal is received. A question mark is
displayed after the physical quantity.
• Check whether the entered parameters are correct, especially the outer pipe diameter,
the pipe wall thickness and the sound speed of the fluid. Typical errors: The circumfer -
ence or the radius was entered instead of the diameter. The inner pipe diameter was
entered instead of the outer pipe diameter.
• Check the number of sound paths.
• Make sure that the recommended transducer distance was adjusted when mounting
the transducers.
• Make sure that an appropriate measuring point is selected and the number of sound
paths was entered correctly.
• Try to establish a better acoustic contact between the pipe and the transducers.
• Enter a lower value for the number of sound paths. The signal attenuation might be too
high due to a high fluid viscosity or deposits on the inner pipe wall.
The measuring signal is received but no measured values can be obtained
• A exclamation point (
!
) in the lower line on the right indicates that the defined upper lim -
it of the flow velocity is exceeded and, therefore, the measured values are marked as
invalid. The limit has to be adapted to the measuring conditions or the check has to be
deactivated.
• If no exclamation point is displayed, a measurement at the selected measuring point is
impossible.
Signal loss during the measurement
• If there is no measuring signal after the pipe had been run empty and refilled, contact
FLEXIM.
• Wait a moment until the acoustic contact is reestablished. The measurement can be in -
terrupted due to a temporarily higher proportion of gas bubbles and solids in the fluid.
The measured values substantially differ from the expected values
• Wrong measured values are often caused by wrong parameters. Make sure that the en -
tered parameters are correct for the measuring point.