FLUXUS G80x 3 General Principles
14 UMFLUXUS_G8V4-6-1EN, 2018-10-10
3.3 Measurement Arrangements
3.3.1 Terms
Diagonal arrangement
The transducers are mounted on the opposite sides of the pipe (see Fig. 3.5).
Reflection arrangement
The transducers are mounted on the same side of the pipe (see Fig. 3.6).
Sound path
The distance covered by the ultrasonic signal after crossing the pipe once. The number of the sound paths is:
• odd if the measurement is conducted in the diagonal arrangement (see Fig. 3.5)
• even if the measurement is conducted in the reflection arrangement (see Fig. 3.6).
Beam
The path covered by the ultrasonic signal between the transducers: the transducer emitting the ultrasonic signal and the
transducer receiving it. A beam consists of 1 or several sound paths (see Fig. 3.7 or Fig. 3.8).
Fig. 3.4: Signals and transit time difference ∆t
Fig. 3.5: Diagonal arrangement Fig. 3.6: Reflection arrangement
Fig. 3.7: 1 beam, 4 sound paths, reflection arrangement Fig. 3.8: 2 beams, 3 sound paths, diagonal arrangement
∆t
signal in the
flow direction
signal against
the flow direction
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