Flexim PIOX S502ID, Operating Instruction

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6 Mounting
6.2 Transducers
PIOX S502ID
2020-01-24, UMPIOX_S502IDV1-2EN
22
6.2.1.2 Pipe preparation
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 rust or loose paint.
• Use coupling foil or apply a bead of coupling compound along the center line of the contact surface of the transducers.
• Observe that there must be no air pockets between the transducer contact surface and the pipe wall.
6.2.1.3 Selection of the measurement arrangement
If the measuring point is situated near an elbow, the following measurement arrangements are recommended for the
selection of the sound beam plane.
Caution!
Contact with grinding dust
This may result in injuries (e.g., breathing difficulties, skin reactions, eye irritations).
→ Wear the required personal protective equipment.
→ Observe the applicable rules.
Important!
The pipe has to be sufficiently stable to withstand the pressure exerted by the transducers and the tension straps.
Notice!
Observe the selection criteria of pipe and measuring point.
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
• transverse 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