Yokogawa EJX430B - Manual (Page 74)

<9. Maintenance>
9-9
IM 01C27B01-01EN
Abnormalities appear in measurement.
: Areas where self-diagnostic offers support
Is process variable
itself abnormal?
Inspect the
process system.
Isolate problem in
measurement system.
Does problem exist in
receiving instrument?
Check/correct
environmental conditions.
Inspect receiver.
Check transmitter.
Check/correct operating
conditions.
Measurement system problem
F0907.ai
YES
NO
NO
YES
Environmental conditions
Operating conditions
Transmitter itself
Figure 9.7 Basic Flow and Self-Diagnostics
9.5.2 Troubleshooting Flowcharts
Check display of the error code.
Check self-diagnostics by the device configuration tools.
Does the self-diagnostic
indicate problem location?
Contact Yokogawa service personnel.
F0908.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 impulse
piping,pressure-detector section, etc.
Fully close equalizing valve, and fully
open high pressure and low pressure
valves.
Are valves opened or
closed correctly?
Is there any pressure leak?
YES
NO
YES
NO
NO
YES
Refer to Alarm Message Summary in
Subsection 9.5.3.
Is the Field Wireless Network
setting correct?
NO
YES Reconnect to the Field Wireless
Network.