6 Mounting
FLUXUS G801
6.2 Transducers
29
UMFLUXUS_G801V1-0EN, 2020-06-26
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.
• Install the damping mats.
• Use coupling foil (only if no damping mats are installed) or apply a bead of acoustic 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, damping mat and pipe wall.
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 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
