Troubleshooting/Faqs; Eliminating Process Errors - Siemens SITRANS FUS060 Operating Instructions Manual

Troubleshooting/FAQs

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
Display shows no flow, and/or a
flashing "F" is displayed continu‐
ously/occasionally
SITRANS FUS060 with PROFIBUS PA
Operating Instructions, 09/2021, A5E02225054-AD
Diagnostics Cause
Pipe not filled with liquid Make sure that the pipe is filled or at
• Error "Measure‐
ment path error" is
pending
Cable broken/detached
• 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‐
Permanent disturbance
tive paths is not sta‐
inside the pipe
ble
• Error counters (me‐
nus 6.5.4.X) are not
equal to 0.
Remedy
least the sound path is covered with
liquid.
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.
If possible, make sure that the trans‐
ducer window inside the pipe is not
damaged or that no permanent dis‐
turbance is present.
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