4 Basics – flow measurement
PIOX S72* 4.2 Measurement arrangements
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UMPIOX_S72xV1-9EN, 2022-05-15
4.2 Measurement arrangements
4.2.1 Terms
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 carried out in diagonal arrangement
• even if the measurement is carried out in reflection arrangement
Beam
The path covered by the ultrasonic signal between the transducers, i.e., the transducer emitting the ultrasonic signal and
the transducer receiving it. One beam consists of 1 or several sound paths.
Fig. 4.3: Transit time difference Δt
1 – signal in the flow direction
2 – signal against the flow direction
diagonal arrangement reflection arrangement
The transducers are mounted on opposite sides of the pipe. The transducers are mounted on the same side of the pipe.
Fig. 4.4: Diagonal arrangement with
2 beams and 3 sound paths
Fig. 4.5: Reflection arrangement with
1 beam and 4 sound paths
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