Flexim PIOX S502ID, Operating Instruction

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3 General principles
PIOX S502ID 3.1 Measurement principle
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UMPIOX_S502IDV1-2EN, 2020-01-24
3 General principles
3.1 Measurement principle
The measuring system PIOX S502ID serves to detect defined fluids in a pipe. The measured sound speed and
temperature of the fluid are evaluated. The sound speed at a certain temperature and concentration is a substance-
specific quantity. The deviation of this substance-specific quantity from the entered parameters of the expected fluid is
transmitted via the status outputs.
3.2 Measurement arrangements
3.2.1 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.
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. 3.1: Diagonal arrangement with 1 beam and
3 sound paths
Fig. 3.2: Reflection arrangement with 1 beam and
4 sound paths