Flexim FLUXUS F401, Руководство по эксплуатации

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10 Troubleshooting
10.2 Measuring point selection
FLUXUS F401
2020-06-12, UMFLUXUS_F401V2-1EN
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10.2 Measuring point selection
• Make sure that the recommended min. distance to any disturbance source is observed.
• Avoid measuring points with deposit formation in the pipe.
• Avoid measuring points in the vicinity of deformations and defects on the pipe as well
as welds.
• Make sure the pipe surface at the selected measuring point is even.
• 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 transducers.
• When measuring on a horizontal pipe, the transducers have to be mounted laterally on
the pipe.
• The measuring point on a vertically mounted pipe has always to be filled. The fluid
should flow upward.
• No gas bubbles should form (even bubble-free fluids can form gas bubbles when the
fluid expands, e.g., upstream of pumps and downstream of great cross-section enlarge -
ments).
10.3 Maximum acoustic contact
see section 6.2
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 > 1 000 mm²/s is only conditionally possible.