136 UMFLUXUS_G6V4-2EN, 2011-03-29
FLUXUS G60x 19 Wall Thickness Measurement (Optional)
19 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 thick-
ness 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 (if the wall thickness is known).
Fig. 19.1: Measurement principle
19.1 Activation of the Wall Thickness Measurement
Connect the wall thickness probe to the measuring channel A or B. The wall thickness
measuring mode is activated automatically.
The main menu of the wall thickness measurement is displayed. The menu structure is
similar to the structure of the flow measurement. The program branches are adapted to
the wall thickness measurement.
Note! With some few exceptions, the transversal sound speed of a materi-
al is approx. 30...60 % of the longitudinal sound speed.
A message is displayed that the wall thickness probe has
been detected.
P r ü f k o p f
P r ü f k o p f k a b e l
M a t e r i a l p r o b e
wall thickness
probe
pipe
cable
*WALL THICKNESS*
*DETECTED ON A:*
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