Flexim FLUXUS F401, Operating Instruction

Page: 34 / 160

6 Installation
6.2 Transducers
FLUXUS F401
2020-06-12, UMFLUXUS_F401V2-1EN
34
6.2.1.3 Selection of the measurement arrangement
If the measuring point is situated near an elbow, the following measurement arrange -
ments are recommended for the selection of the sound beam plane.
Diagonal arrangement with 1 beam Reflection arrangement with 1 beam
• wider flow velocity and sound speed
range compared to the reflection ar -
rangement
• use in the presence of deposits on the in -
ner pipe wall or with strongly attenuating
gases or liquids (only 1 sound path)
• smaller flow velocity and sound speed
range compared to the diagonal arrange -
ment
• transverse flow effects are compensated
because the beam crosses the pipe in 2
directions
• higher accuracy of measurement be -
cause the accuracy increases with the
number of sound paths
Vertical pipes Horizontal pipes
• The sound beam plan is selected in an
angle of 90° to the elbow plane. The
elbow is upstream of the measuring
point.
• The sound beam plane is selected in an
angle of 90° ± 45° to the elbow plane.
The elbow is upstream of the measuring
point.
elbow plane
flow
direction
flow direction
elbow
plane