Flexim FLUXUS H721 - Page 32

6 Mounting
6.2 Transducers FLUXUS H721
2022-05-15, UMFLUXUS_H721V1-5EN
32
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 any rust or loose paint.
6.2.1.3 Selection of the measurement arrangement
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 fasteners.
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
• 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