Yokogawa EJX438B - Manual (Page 69)

<8. Maintenance>
8-8
IM 01C27H01-01EN
8.5.2 Troubleshooting Flowcharts
Check display of the error code.
Check self-diagnostics by the device configuration tool.
Does the self-diagnostic
indicate problem location?
Contact Yokogawa service personnel.
F0806.ai
The following sorts of symptoms indicate that transmitter
may not be operating properly.
Example : • There is no output signal.
• Output signal does not change even though
process variable is known to be varying.
• Output value is inconsistent with value
inferred for process variable.
Fix pressure leaks, paying particular
attention to connections for
pressure-detector section.
Is there any pressure leak?
YES
NO
YES
NO
Refer to Alarm Message Summary in
Subsection 8.5.3.
Is the Field Wireless Network
setting correct?
NO
YES Reconnect to the Field Wireless
Network.
Connect the device configuration tool and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0807.ai
Are high
and low pressure side
diaphragm seals correctly
connected to the
process?
Refer to Alarm Message Summary
in Subsection 8.5.3
YES
NO
Use the transmitter within the
measurement range shown on the
data plate.
Correct the connections.
NO
YES
YES
Adjust the zero point.
NO
NO
YES
Is the liquid level as specified?
Is zero point
adjusted correctly?
Output travels beyond 0% or 100%.