20 Wall thickness measurement (optional)
20.3 Parameter input FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
200
20.3 Parameter input
20.3.1 Parameter input for the wall thickness measurement
The sound speed of the pipe material has to be entered to measure the wall thickness.
• Select Wall Thickness in Output Options\Physic. Quant. for the measuring
channel to which the wall thickness probe is connected.
• Select the pipe material in Parameter\Pipe Material.
• If the material is not in the list, select Other Material.
• Press ENTER.
A value for the longitudinal sound speed of the selected material is recommended. If
Other Material has been selected, 0.0 m/s will be displayed.
• Enter the sound speed, if necessary.
• Press ENTER.
Output Options\Physic. Quant.\Wall Thickness
Parameter\Pipe Material
The measurement can only be started if the entered sound speed is > 0.
Compared to the flow measurement, the sound speed has a great, approximately
linear influence on the measuring result. The input of a 10 % higher sound speed is
the result of a wall thickness which is approx. 10 % too high.
The actual sound speed of a material often differs substantially from the values pub-
lished in the literature as it depends on the composition, the manufacturing process
and the temperature. The sound speed values given in the annex C.1 only serve as
an orientation.
The longitudinal sound speed of a material can be precisely measured using a refer-
ence object of known thickness, see section 20.4.2.
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