Flexim FLUXUS F60 Series, Руководство по эксплуатации, Страница: 18 / 244

3 General principles
3.1 Measurement principle
FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
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3.1.4 Measurement of the flow velocity in the HybridTrek mode
The HybridTrek mode combines the TransitTime and the NoiseTrek mode. During a
measurement in the HybridTrek mode, the transmitter automatically toggles between the
TransitTime and the NoiseTrek mode depending on the gaseous or solid content.
The measurement setup is the same as the one in the TransitTime mode.
3.1.5 Measurement of the flow velocity in the NoiseTrek parallel beam
mode
Pipes with a small pipe diameter or fluids which strongly attenuate the ultrasonic signal
can cause a reduction of the transit time in the fluid with the result that the signal quality
is no longer sufficient. In this case the NoiseTrek parallel beam mode has to be used.
The NoiseTrek parallel beam mode works the same way the NoiseTrek mode does, the
only difference is that the sending and receiving process do not occur in the same trans-
ducer. This leads to a better signal quality. The transducers are mounted in parallel on
the pipe at a small angle, see Fig. 3.5.
This measurement arrangement cannot be used in the TransitTime mode.
Fig. 3.5: Measurement arrangement in the NoiseTrek parallel beam mode