IM 1F6A0-01E
8-1
8. TROUBLESHOOTING
8. TROUBLESHOOTING
CAUTION
Please avoid replacing the amplifier unit from the case, and the vortex shedder bar. When these procedures are
needed, please contact the nearest Yokogawa office.
8.1 Flow
●
Large flowmeter errors and flowrate reading fluctuates.
●
After the output showed correctly, the indication
goes down to zero at certain time.
When this problem occurred, the cause is suspected of
deterioration of sensor sensitivity and turbulent of fluid flow
due to sticky stuff on the shedder bar and flowmeter inner
tube.
How to cope with this problem
1) Referring item 8.2 “Vortex Shedder Assembly Removal”,
take out the Vortex Shedder bar and clean it.
2) If there is the sticky stuff on inner tube of the flowmeter,
remove the flowmeter body from adjacent pipes and
clean it.
Are the parameters
configured correctly at
operating conditions?
Is straight lengths of
pipeline stable?
Configure the parameters
correctly
No
Yes
Yes
Was a faulty area
found with selfdiagnosis?
No
Ensure the straight lengths of pipeline
referring to "3:INSTALLATION".
No
Does gaskets protrudes?
Yes
Replace the gaskets
referring "3:INSTALLATION".
Yes
Refer to the error code list and check
for recovery measures.
• If a built-in indicator is attached,
check the display of the error code.
• Connect a hand-held terminal and
check self-diagnostic.
Does it snappy abnormally
in the flowmeter area?
Check the cavitation referring to
"2.5:Sizing".
Yes
Is YEWFLO properly grounded?
No
Ground YEWFLO.
No
Does the value in
"K34:VORTEX FREQ."
undergo a lot of changes?
Yes
This case is due to sticklly
stuff vortex shedder bar.
Check the piping inner surfaces.
Normal
No
Check standards.
Yes
Yes
F080101.EPS
Note 1:
Note 2:
This is the temperature and pressure at digital YEWFLO
mounted place.
Contact with our service in case this is not carried out into
the right statement.
No
