166 UMFLUXUS_G6V4-2EN, 2011-03-29
FLUXUS G60x 22 Troubleshooting
A higher proportion of droplets or solids in the medium scatter and absorb the ul-
trasonic signal and therefore attenuate the measuring signal
A measurement is impossible if the value is 10 %. If the proportion is high, but < 10 %,
a measurement is only possible under certain conditions.
22.5 Large Deviations of the Measured Values
The entered sound speed of the medium is wrong
A wrong sound speed can result in the ultrasonic signal that is reflected directly on the
pipe wall being mistaken for the measuring signal that has passed through the medium.
The flow calculated on the basis of the wrong signal by the transmitter is very small or
fluctuates around zero.
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 derived from the flow velocity will also be marked as in-
valid. 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 (default: 2.5 cm/s) has to be set to a low value in order to be able
to measure at low flow velocities.
The entered pipe roughness is not appropriate
The flow velocity of the medium is outside the measuring range of the transmitter
The measuring point is not appropriate
Select another measuring point to check whether the results are better. Because pipes
are never rotationally symmetric, the flow profile is affected. Change the transducer posi-
tion according to the pipe deformation.
The operating volumetric flow rate meets the expectations, but the standard volu-
metric flow rate deviates strongly
The parameters for the measurement of the standard volumetric flow rate have not been
entered correctly (see section 17.4).
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