7 Mounting
PIOX S72* 7.2 Transducers
33
UMPIOX_S72xV1-9EN, 2022-05-15
Rust, paint or deposits on the pipe absorb the sound signal. A good acoustic contact between the pipe and the
transducers is obtained as follows:
• Clean the pipe at the selected measuring point.
– If present, the paint layer has to be smoothed by grinding. The paint does not need to be removed completely.
– Remove any rust or loose paint.
7.2.1.3 Selection of the measurement arrangement
The determination of the fluid sound speed which is necessary for the analysis, is independent of the flow profile. The
following measuring arrangements can be selected:
Diagonal arrangement with 1 beam Reflection arrangement with 1 beam
• wider flow velocity and sound speed
range compared to the reflection
arrangement
• use in the presence of deposits on the
inner pipe wall or with strongly
attenuating gases or liquids (only 1
sound path)
• smaller flow velocity and sound speed
range compared to the diagonal
arrangement
• cross-flow effects are compensated
because the beam crosses the pipe in 2
directions
• higher accuracy of measurement
because the accuracy increases with the
number of sound paths
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