FLUXUS WD100, WD200 9 Basic Measurement
48 UMFLUXUS_F5WDV1-1EN, 2016-04-08
9.6.3 Value of the Sound Speed
The sound speed of the fluid can be displayed during the measurement by pressing key .
If an approximate range for the sound speed has been entered in the program branch Parameter and the transducer dis-
tance has been optimized afterwards as described in section 9.6.2, it is recommended to write down the sound speed for
the next measurement. By doing this, it will not be necessary to repeat the fine adjustment.
Also write down the fluid temperature because the sound speed depends on the temperature. The value can be entered in
the program branch Parameter.
9.7 Start of the Measurement
The outputs and the serial interface continuously receive the measured values of the corresponding channel. The results
are displayed according to the currently selected output options. The default unit of measurement of the volumetric flow
rate is m³/h. For the selection of the values to be displayed and for the setting of the output options see chapter 10. For fur-
ther measuring functions see chapter 11.
9.8 Detection of the Flow Direction
The flow direction in the pipe can be detected with the help of the displayed volumetric flow rate in conjunction with the ar-
row on the transducers:
• The fluid flows in the direction of the arrow if the displayed volumetric flow rate is positive (e.g., 54.5 m³/h).
• The fluid flows against the direction of the arrow if the displayed volumetric flow rate is negative (e.g., -54.5 m³/h).
9.9 Interruption of the Measurement
The measurement is interrupted by pressing key BRK if it is not protected by a program code (see section 11.8).
Note! If the transducer distance is changed during the measurement, the consistency check has to be re-
peated.
The measured values are displayed in the lower line. Press ENTER to return to the fine ad-
justment of the transducer distance (see section 9.6.1).
Note! Be careful not to stop a current measurement by inadvertently pressing key BRK!
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