Description
3.4 Principle of operation
SITRANS FUS080 transmitter
18 Operating Instructions, 07/2012, A5E03059912-02
This measuring principle offers the advantage that it is independent of variations in the actual
sound velocity of the liquid, i.e. independent of the temperature.
The proportional flow factor K is determined by wet calibration or calculated by "Auto" in
case of manual programming of mechanical/geometrical pipe data (SONOKIT only). The
transducer angle (θ), distance between sensors (L) and pipe dimension (D
i
and D
u
) are
shown in the figure below.
1A
1B
Figure 3-3 Measuring principle
The ultrasonic signal is sent directly between the transducers. The advantage gained
sending signals from point to point is an extremely good signal strength.
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