20 Wall thickness measurement (optional)
20.4 Measurement
FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
202
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.
To minimize errors when measuring the wall thickness, measure the longitudinal sound
speed of the material on a reference object of the same material with known dimensions.
• The reference object should be even and smooth.
• The thickness of the reference object should be comparable to the max. thickness of
the pipe.
20.4.2
Measurement of the sound speed
This display will be indicated if the sound speed is 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 of the display.
• 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.
Notice!
The sound speed of the material depends on the temperature. Therefore, the sound
speed of a reference object should be measured at the place where the flow will be
measured later to obtain the sound speed at the correct temperature.
Notice!
For pipe materials whose longitudinal sound speed can be used for the measure-
ment of the volumetric flow rate see annex C.1.
c-LONGITUDINAL
m/s?
c-LONGITUDINAL
5370
m/s