SCP System • System description
CP_SEM_60-00-00.002 23
Fig. 10: Functional diagram of flow probe (2)
A particular feature is the lack of sensitivity to measurement errors that might be caused by different
positions of the tube within the probe. The change of direction (and the subsequent change in transit
time) of the ultrasound signal is dependent on the movement vector (vector components in the
direction of flow) of the liquid:
◗ In the case of a tube that is aligned straight in the probe, the movement vector (the shift in the
ultrasound signal according to the flow rate) is the same on both transits.
◗ If the tube runs at an angle through the probe, two different movement vectors arise, the sum of
which corresponds to the original vectors. This thus ensures a correct measurement, irrespective
of the exact position of the tube.
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