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86 UMG70XV3-4EN 12.01.2009
10 Basic Measurement
10.5 Define Number of Sound Paths
The number of transits of the ultrasonic waves through the medium depends on the
placement of the transducers on the pipe.
If the number of transits is odd (diagonal mode), the transducers will be mounted on op-
posite sides of the pipe.
If the number of transits is even (reflection mode), the transducers will be mounted on the
same side of the pipe.
An increased number of transits means increased accuracy of the measurement. Howev-
er, the increased transit distance results in a higher attenuation of the signal.
The reflections on the opposite pipe wall and deposits on the inner pipe wall cause addi-
tional amplitude losses of the sound signal.
If the signal is attenuated strongly by the medium, the pipe, deposits, etc., the number of
sound paths has to be set to 1 if necessary.
Fig. 10.1: Sound path and transducer distance (A)
Note!
Exact positioning of the transducers is easier for an even number (re-
flection mode) of transit paths than for an odd number (diagonal
mode).
A value for the number of sound paths corresponding to
the connected transducers and the entered parameters
will be recommended. Change the value if necessary.
Press ENTER.
A
!
A
A < 0
reflection mode, number of sound paths = 2 diagonal mode, number of sound paths = 3
diagonal mode, number of sound paths = 1, negative transducer distance
A: Sound Path
2 NUM