22 Troubleshooting FLUXUS G60x
UMFLUXUS_G6V4-2EN, 2011-03-29 165
The measured values substantially differ from the expected values
• Wrong measured values are often caused by wrong parameters. Make sure that the
entered parameters are correct for the measuring point.
• If the parameters are correct, see section 22.5 for the description of typical situations in
which wrong measured values are obtained.
22.2 Selection of the Measuring Point
• Make sure that the recommended min. distance to any disturbance source is observed
(see chapter 5, Tab. 5.2).
• Avoid measuring points with deposit formation in the pipe.
• Avoid measuring points in the vicinity of deformations and defects on the pipe and in
the vicinity of welds.
• Measure the temperature at the measuring point and make sure that the transducers
are suitable for this temperature.
• Make sure that the outer pipe diameter is within the measuring range of the transduc-
ers.
• When measuring on a horizontal pipe, the transducers must be mounted on the side of
the pipes.
•
22.3 Maximum Acoustic Contact
Observe the instructions in chapter 8.
22.4 Application Specific Problems
The entered sound speed of the medium is wrong
The entered 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 orientation.
The entered pipe roughness is not appropriate
Check the entered value. The state of the pipe should be taken into account.
Measurements on porous pipe materials (e.g. concrete or cast iron) are only possi-
ble under certain conditions
Contact FLEXIM.
The pipe lining may cause problems during the measurement if it is not firmly at-
tached to the inner pipe wall or consists of an acoustically absorbing material
Try measuring on a liner free section of the pipe.
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