Troubleshooting; Flow - YOKOGAWA DY025 User Manual

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.
• If a built-in indicator is attached,
check the display of the error code.
• Connect a hand-held terminal and
check self-diagnostic.
Was a faulty area
found with selfdiagnosis?
No
Are the parameters
configured correctly at
operating conditions?
Yes
Is straight lengths of
pipeline stable?
Yes
Does gaskets protrudes?
No
● 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 coating on the shedder bar and flowmeter inner tube.
Yes
Refer to the error code list
and check for recovery
measures.
No Configure the parameters
correctly
Ensure the straight lengths
No
of pipeline referring to
"2:INSTALLATION".
Replace the gaskets
Yes
referring "2:INSTALLATION".
Is there a snapping
sound from the flowmeter ?
No
Is digitalYEWFLO
properly grounded?
Yes
Does the value in
"K34:VORTEX FREQ."
undergo a lot of
changes?
No
Normal
Yes
Check standards.
Note 1: This is the temperature and pressure at digitalYEWFLO
mounted place.
Note 2: Contact with our service in case this is not carried out into
the right statement.
How to cope with this problem
1) Referring item 7.5 "Vortex Shedder Removal", take out
the Vortex Shedder bar and clean it.
2) If there is the coating on inner tube of the flowmeter,
remove the flowmeter body from adjacent pipes and
clean it.
8-1
8. TROUBLESHOOTING
Check the cavitation
Yes
referring to "9.5:Sizing".
No
Ground YEWFLO.
This case is due to coating
Yes
of stuff vortex shedder bar.
Check the piping inner
surfaces.
F080101.EPS
IM 01F06A00-01E