19 Wall Thickness Measurement (Optional) FLUXUS G60x
UMFLUXUS_G6V4-2EN, 2011-03-29 139
19.3.2 Measurement of the Sound Speed
19.3.3 Further Information on the Measurement
Note! The sound speed of the material depends on the temperature.
Therefore, the sound speed of a reference object should be mea-
sured at the place where the flow will be measured later to obtain the
sound speed at the correct temperature.
This display will be indicated if the sound speed has been
selected as physical quantity for the measuring channel
connected to the wall thickness probe.
As long as there is no valid measured value, the unit of
measurement and a question mark will be displayed in the
lower line.
Apply a thin film of the coupling compound to the pipe wall.
Press the wall thickness probe against the pipe wall in this
position.
As soon as a valid measured value is obtained, it will be
displayed in the lower line. A tick will be displayed in the
upper line on the right.
The measured value remains on the display when the wall
thickness probe is removed from the pipe.
Note! For pipe materials whose longitudinal sound speed can be used for
the measurement of the volumetric flow rate see annex C.1.
Press key to obtain information on the measuring sig-
nal.
This message will be displayed if the measuring signal is
sufficient. The LED of the channel will light green.
This message will be displayed if the measuring signal is
not sufficient (# = number). The LED of the measuring
channel will light red.
Press key again. The bar graph of the signal quality
(Q=) will be displayed.
If the signal is not sufficient for a measurement, UNDEF will
be displayed. The LED of the measuring channel will light
red. Shift the wall thickness probe slightly on the pipe until
the LED of the measuring channel lights green.
c-LONGITUDINAL
5370 m/s
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