Troubleshooting/FAQs
9
9.1
Eliminating process errors
Only two general groups of errors are shown in the display: "Process error" and "Device error".
Device errors describe hardware errors, see Table 7-1 Error messages (Page 53).
Two main groups of process errors are:
• Measuring path error
The medium in the measuring line is not permeable to sound; this applies both when the pipe
is filled with gas or is empty. The measured value on the display is set to zero. Cable is broken
or detached.
The measured values have a very high dispersion so that errors in the measuring signal
evaluation is indicated. It can be caused by disturbances in the flow pipe due to cavitation,
twist or inhomogeneity such as bubbles or foreign bodies.
• Flow measurement unreliable
The displayed measured values are not reliable and an "F" flashes in the right hand corner of
the display.
Table 9-1
Error symptoms
Symptoms
Diagnostics
Cause
Remedy
Display shows no flow, and/or a
flashing "F" is displayed continu‐
ously/occasionally
• Error "Measure‐
ment path error" is
pending
• Gain (menus
6.5.1.X) for the ac‐
tive paths > 250
• TOF (menus
6.5.5.X and
6.5.6.X) for the ac‐
tive paths is not sta‐
ble
• Error counters (me‐
nus 6.5.4.X) are not
equal to 0.
Pipe not filled with liquid Make sure that the pipe is filled or at
least the sound path is covered with
liquid.
Cable broken/detached
Make sure that the transducer cable
is connected in the terminal housing
of the transmitter.
Make sure that the screen and center
pin is connected inside the transduc‐
er top.
Permanent disturbance
inside the pipe
If possible, make sure that the trans‐
ducer window inside the pipe is not
damaged or that no permanent dis‐
turbance is present.
SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD
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