IM 01C22K01-01E
9-8
9. MAINTENANCE
Connect BRAIN TERMINAL and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0909.EPS
Is power supply
polarity correct?
Are valves opened or
closed correctly?
Refer to error message summary in
Subsection 8.5.2 to take actions.
YES
NO
NO
YES
Refer to Section 6.3 to check/correct
polarity at each terminal from power
supply to the terminal box.
Refer to Subsection 5.1.1 and install
the transmitter as appropriate for the
flow direction of fluid.
Fix pressure leaks, paying particular
attention to connections for impulse
piping, pressure-detector section, etc.
Fully open the valves on the upstream
and downstream sides.
NO
YES
YES
NO
YES
Adjust the zero point.
NO
NO
YES
Is there any pressure leak?
Is the transmitter
installed as appropriate for
the flow direction?
Is zero point
adjusted correctly?
Output travels beyond 0% or 100%.
Connect BRAIN TERMINAL and check self-diagnostics.
Contact Yokogawa service personnel.
F0910.EPS
Are valves opened or
closed correctly?
Is the manifold
mounted appropriately for
the flow direction?
Refer to error message summary in
Subsection 8.5.2 to take actions.
Refer to Subsection 9.4.4 and mount
the manifold appropriately for the flow
direction of fluid.
Provide lagging and/or cooling, or allow
adequate ventilation.
Refer to Section 9.2 when selecting
instruments for calibration.
Fully open the valves on the upstream
and downstream sides.
Refer to section 6.6 for rated voltage
and load resistance.
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?
Are power supply
voltage and load resistance
correct?
Were appropriate
instruments used for
calibration?
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Refer to Subsection 9.4.4 to clean the
manifold assembly.
YES
NO
Is orifice clogged with
dust, etc?
