5 Selection of the measuring point FLUXUS F808, F809
UMFLUXUS_F808_8091V1-2-1EN, 2019-08-23 25
5.4 Selection of the sound beam plane near an elbow
Vertical pipes Horizontal pipes
• The sound beam plane (see section 3.3.1) has an angle
of 90° to the elbow plane. The elbow is upstream of the
measuring point.
• The sound beam plane (see section 3.3.1) has an angle
of 90° ± 45° to the elbow plane. The elbow is upstream of
the measuring point.
Measurements in both directions Measurements in reflection arrangement with 2 beams
and 2 planes
• The sound beam plane (see section 3.3) is selected ac-
cording to the nearest elbow (horizontal or vertical, de-
pending on the pipe orientation – see above).
• The 2 sound beam planes (see section 3.3) have an an-
gle of 45° to the elbow plane. The elbow is upstream of
the measuring point.
• With horizontal pipes, the transducers are mounted on
the upper half of the pipe.
elbow plane
flow direction
elbow plane
flow direction
flow direction
flow direction
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