Yokogawa EJX430B - Manual (Page 75)

<9. Maintenance>
9-10
IM 01C27B01-01EN
Connect the device configuration tool and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0909.ai
Are valves opened or
closed correctly?
Refer to Alarm Message Summary in
Subsection 9.5.3.
YES
NO
Refer to individual model user manuals
and connect piping as appropriate for
the measurement purpose.
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.
NO
YES
YES
NO
YES
Adjust the zero point.
NO
NO
YES
Is there any pressure leak?
Is impulse piping
to high pressure and low
pressure side correct?
Is zero point
adjusted correctly?
Output travels beyond 0% or 100%.
Connect the device configuration tool and check self-diagnostics.
Contact Yokogawa service personnel.
F0910.ai
Are valves opened or
closed correctly?
Is impulse piping
connected correctly?
Refer to Alarm Message Summary in
Subsection 9.5.3.
Provide lagging and/or cooling, or allow
adequate ventilation.
Refer to Section 9.2 "Calibration
Instruments Selection".
Fully close equalizing valve, and fully
open high pressure and low pressure
valves.
Refer to individual model user manuals
and connect piping as appropriate for
the measurement purpose.
Adjust the output.
Is transmitter
installed where there is
marked variation in
temperature?
Is output adjusted correctly?
Large output error.
Does the self-
diagnostic indicate problem
location?
Were appropriate
instruments used for
calibration?
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES