IM 01C25F01-01E
8-7
8. MAINTENANCE
Connect a communicator and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0807.EPS
Is power supply
polarity correct?
Are valves opened or
closed correctly?
Refer to error message summary in
each communication manual 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 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 a communicator and check self-diagnostics.
Contact Yokogawa service personnel.
F0808.EPS
Are valves opened or
closed correctly?
Is impulse piping
connected correctly?
Refer to error message summary in
each communication manual to take
actions.
Refer to Section 6.6 for rated voltage
and load resistance.
Provide lagging and/or cooling, or allow
adequate ventilation.
Refer to Section 8.2 when selecting
instruments for calibration.
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?
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
