9 Measurement
9.3 Start of the measurement FLUXUS G809
2020-06-25, UMFLUXUS_G809V2-2EN
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Consistency check
If a wide range for the sound speed has been entered in the program branch Parameter or the exact parameters of the
fluid are unknown, a consistency check is recommended.
The transducer distance can be displayed during the measurement by scrolling the key .
The optimum transducer distance is displayed in brackets (here: 50.0 mm) in the upper line, followed by the entered trans-
ducer distance (here: 54.0 mm). The latter value has to correspond to the adjusted transducer distance.
• Press ENTER to optimize the transducer distance.
The optimum transducer distance is calculated on the basis of the measured sound speed. It is therefore a better approx-
imation than the first recommended value which had been calculated on the basis of the sound speed range entered in the
program branch Parameter.
If the difference between the optimum and entered transducer distance is less than specified in Tab. 9.4, the measure-
ment is consistent and the measured values are valid. The measurement can be continued.
• If the difference is greater, adjust the transducer distance to the displayed optimum value.
• Afterwards, check the signal quality and the signal amplitude bar graph.
• Press ENTER.
Repeat the steps for all channels on which a measurement is made.
Tab. 9.4: Standard values for signal optimization
transducer frequency
(3rd character of the technical type)
max. difference between the optimum and the entered transducer distance [mm]
shear wave transducer Lamb wave transducer
F - -60…+120
G 20 -45…+90
H - -30…+60
K 15 -20…+40
M 10 -10…+20
P 8 -5…+10
Q 6 -3…+5
S 3 -
Notice!
If the transducer distance is changed during the measurement, the consistency check has to be repeated once again.
L=(50.0) 54.0 mm
54.5 m3/h
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