10 Troubleshooting
FLUXUS F502TE 10.4 Application-specific problems
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UMFLUXUS_F502TEV1-5EN, 2020-05-29
10.4 Application-specific problems
A fluid with a wrong sound speed was selected.
If the selected sound speed in the fluid does not match the actual one, the transducer distance can probably not be determined
correctly.
The fluid sound speed is used to calculate the transducer distance and is therefore very important for the transducer positioning.
The sound speeds stored in the transmitter only serve as an orientation.
The entered pipe roughness is not appropriate.
Check the entered value. The pipe state should be considered.
Measurements on pipes made of porous materials (e.g., concrete or cast iron) are only conditionally possible.
Contact FLEXIM.
The pipe lining may cause problems during the measurement if it is not firmly attached to the inner pipe wall or
consists of acoustically absorbing material.
Try to measure on a section of the pipe free from lining.
Highly viscous fluids strongly attenuate the ultrasonic signal.
The measurement of fluids with a viscosity of > 1000 mm²/s is only conditionally possible.
Gas bubbles or solids present in high concentration in the fluid scatter and absorb the ultrasonic signal and thus
attenuate the measuring signal.
A measurement is impossible if the value is ≥ 10 %. If the proportion is high, but < 10 %, a measurement is only conditionally
possible.
10.5 Significant deviations of the measured values
A fluid with a wrong sound speed was selected.
If a fluid was selected whose sound speed does not match the actual one, a pipe wall signal can be mistaken for the measuring
signal. The flow calculated by the transmitter on the basis of the wrong signal is very small or fluctuates around zero.
There is gas in the pipe.
If there is gas in the pipe, the measured flow will be too high because both the liquid and the gas volume are measured.
The defined upper limit of the flow velocity is too low.
All measured flow velocities that are greater than the upper limit will be ignored and marked as invalid. All quantities deviated
from the flow velocity will also be indicated as invalid. If several correct measured values are ignored, the totalizer values will
be too low.
The entered cut-off flow is too high.
All flow velocities below the cut-off flow are set to zero. All derived quantities are also set to zero. The cut-off flow has to be
set to a low value to be able to measure at low flow velocities (default: 2.5 cm/s).
The entered pipe roughness is not appropriate.
The flow velocity of the fluid is outside the measuring range of the transmitter.
The measuring point is not appropriate.
Check whether a different measuring point provides better results. Because pipes are never rotationally symmetric, the
flow profile is affected.
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