9 Measurement
9.5 Field calibration FLUXUS H721
2022-05-15, UMFLUXUS_H721V1-5EN
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9.5 Field calibration
The field calibration function allows a comparison between the actual and the set value of the HPI physical quantity for
each measuring channel.
The field calibration can be carried out for each HPI physical quantity for analysis selectable in the transmitter. Potential
tolerances of pipe geometry and transducer installation have to be compensated by applying a sound speed offset. When
sampling, the temperature and the sound speed are stored for each series of measured values. Up to 64 pairs of
measured values per series of measured values are possible.
After laboratory evaluation of the samples, the set values are entered in the transmitter.
The transmitter calculates the correction of the average sound speed and stores it for all HPI applications.
Start of the measurement
• Select the program branch Measurement.
• Press ENTER until the measured values are displayed.
Storing of calibration values
The sound speed and temperature measured during the sampling have to be stored.
• Press .
The sampling number and the time of sampling are displayed.
Several calibration values can be stored per series of measured values. The calibration values will be stored in the
transmitter until an auto calibration is carried out or the samples are deleted.
If a new measurement is started and new calibration values are stored, the calibration values of the previous series of
measured values are overwritten.
Tab. 9.8: Max. permissible deviation between the recommended and entered transducer distance
transducer frequency (3rd
character of the technical type)
max. difference between the recommended and 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
P8 -5…+10
Q 6 -3…+5
S3 -
Fig. 9.2: Display of measured values
Fig. 9.3: Display of sampling number and time
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