11 Basic Measurement FLUXUS G60x
UMFLUXUS_G6V4-2EN, 2011-03-29 81
11.6.2 Consistency Check
If a wide range for the sound speed has been entered in the program branch Parameter
or the exact parameters of the medium are not known, a consistency check is recom-
mended.
The transducer distance can be displayed during measurement by scrolling with key .
The optimum transducer distance is calculated on the basis of the measured sound
speed. It is therefore a better approximation 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 the entered transducer distance is less than
specified in Tab. 11.1, the measurement 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 val-
ue. Afterwards, check the signal quality and the signal amplitude bar graph (see section
11.6.1). Press ENTER.
Repeat the steps for all channels on which a measurement is being made.
The optimum transducer distance (here: 50.0 mm) is dis-
played in the upper line in parentheses, followed by the en-
tered transducer distance (here: 54.0 mm). The latter val-
ue must correspond to the adjusted transducer distance.
Press ENTER to optimize the transducer distance.
Tab. 11.1: Standard values for signal optimization
transducer frequency
(third character of the
technical type)
Difference between the optimum and the entered transducer dis-
tance [mm]
shear wave transducer lamb wave transducer
G 20 -50...+100
H - -35...+60
K 15 -25...+40
M 10 -10...+20
P 8 -6...+10
Q 6 -3...+5
S3 -
Enter the new adjusted transducer distance. Press EN-
TER.
Scroll with key again until the transducer distance is
displayed and check the difference between the optimum
and the entered transducer distance. Repeat the steps if
necessary.
Note! If the transducer distance is changed during the measurement, the
consistency check will have to be repeated.
L=(50.0) 54.0 mm
54.5 m3/h
Transd. Distance?
50.0 mm
L=(51.1) 50.0 mm
54.5 m3/h
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