FLUXUS G80x 5 Selection of the Measuring Point
26 UMFLUXUS_G8V4-6-1EN, 2018-10-10
5.6 Selection of the Sound Beam Plane near an Elbow 
With vertical pipe orientation With horizontal pipe
• 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. 
With measurements in both directions With measurements in the reflection arrangement with 
2 beams and 2 planes
• The sound beam plane (see section 3.3.1) is selected 
according to the nearest elbow (horizontal or vertical, de-
pending on the pipe orientation - see above). 
• The 2 sound beam planes (see section 3.3.1) have an 
angle 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