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9.3 Reading out speed of sound
The slightly different speeds of sound are also readable (coordinate L-9 to Q-9).
The values of the individual paths should differ only by a little (< 0.5 m/s). An accu-
rate comparison with the nominal speed of sound of the media is limited within the
operating conditions.
Temperature stratification within a pipeline
If no flow is possible when start up, temperature stratification may occur
within the pipeline so that speed of sound of paths with different measuring
levels may deviate significantly from one another.
Convenient function checks with ERZ 2000 (-NG)
If an ERZ 2000 (-NG) is available, the content of valid measuring values (in
%) and the measured speed of sound can also be checked in the column
FH (ultrasonic diagnosis) for each path.
In case the speed of sound is not plausible, troubleshooting with RMGView
possible. If one individual path has failed, then there is probably an error in the
wiring or with the transducers of this path.
Further information can be found at:
Chapter 12, „Alarm and warning messages" on page 176
9 Start Up
USM
Manual USM GT400 · EN10 · May 2021
133
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