User's Manual AXF Magnetic Flowmeter Integral ... - Yokogawa

5.8 Troubleshooting
5.8.1 No Indication
5. MAINTENANCE
Although magnetic flowmeters rarely require maintenance, failures may occur when the
instrument is not operated correctly. This section describes troubleshooting procedures
where the cause of the breakdown is identified through receiver indication.
START
Is an error being displayed? Check the converter display.
Is an error being
displayed?
NO
YES
Refer to the “Alarm Functions” in
the AXFA11, AXFA14, and AXF
Integral Flowmeter [Software
Edition] user manuals.
Is anything else
being displayed?
NO
YES
Is the fuse blown?
NO
YES
Does the
display return when the fuse
is replaced?
YES
NO
Does the
arrow on the tube match the
flow direction?
YES
Check whether the flowtube
is filled with fluid.
NO
End
Perform either of the following:
a. Reinstall the flowtube in
order to make the arrow and
flow direction match.
b. Reverse the setting for the
flow direction.
Is the flowtube
full of fluid?
NO
YES
Check the resistance between
the flowtube’s A, B, and C
terminals using a multimeter.* 1
Is the
resistance 100 M or more
in each case?
NO
Change the piping or the
mounting condition so that
the tube fills with the fluid.
*1: Refer to Section 5.7 for how to check
the resistance of the remote type
flowtube. The integral flowmeter's
resistance cannot be checked.
YES
Remove the tube and
inspect the inside of the pipe.
Is foreign
matter adhering to
the walls?
NO
YES
Remove the foreign matter.
Contact a service center.
F0521.EPS
5-12
IM 01E20D01-01E