20 Wall thickness measurement (optional)
FLUXUS F60*
2017-10-16, UMFLUXUSF60xV5-0EN
198
20 Wall thickness measurement (optional)
If the transmitter has the optional wall thickness measurement, the wall thickness and the
longitudinal sound speed of the pipe can be measured. In this case, a wall thickness
probe that can be connected directly to the socket of a measuring channel will be includ-
ed in shipment. The wall thickness probe will be detected automatically when connected
to the transmitter. The measured wall thickness can be transmitted directly into the cur-
rent parameter record.
A modified transit time method is used to determine the wall thickness or the sound
speed of the pipe.
• The wall thickness probe emits an ultrasonic pulse which propagates in the pipe.
• The pulse is reflected by the boundary layer of the pipe and received by the wall thickness
probe.
• The time difference between emitting and receiving the signal is a measure of the pipe
wall thickness (if the sound speed of the material is known) or of the longitudinal sound
speed of the pipe (if the wall thickness is known).
Touching hot or cold surfaces
This may result in injuries (e.g., thermal damages).
→ Observe the ambient conditions at the measuring point during installa-
tion. Wear the required personal protective equipment. Observe the
applicable rules.
Fig. 20.1: Measurement principle
1 – wall thickness probe
2 – cable
3 – pipe
With some few exceptions, the transversal sound speed of a material is approx.
30...60 % of the longitudinal sound speed.
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