Yokogawa EJA118 User Manual
Page 53
IM 1C22H1-01E
8-6
8. MAINTENANCE
Connect BRAIN TERMINAL and check self-diagnostics.
Does the self-
diagnostic indicate problem
location?
Contact Yokogawa service personnel.
F0806.EPS
Is power supply
polarity correct?
Are high
and low pressure side
diaphragm seals correctly
connected to the
process?
Refer to error message summary in
Subsection 7.5.2 to take actions.
YES
NO
NO
YES
Check/correct polarity at each terminal
from power supply to the terminal box.
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%.
Connect BRAIN TERMINAL and check self-diagnostics.
Contact Yokogawa service personnel.
F0807.EPS
Are power
supply voltage and load
resistance correct?
Is external noise
contained in the outout?
Refer to error message summary in
Subsection 7.5.2 to take actions.
Bind capillaries together as far as
possible or provide lagging.
Provide lagging and/or heat insulation,
or allow adequate ventilation.
Refer to Section 8.2 when selecting
instruments for calibration.
Refer to Section 5.6 to obtain the rated
voltage and load resistance.
Avoid noise by providing complete
grounding, or using shielded wires.
Adjust the output.
Does
the ambient
temperature significantly
differ between the high and low
pressure side
capillaries?
Is output adjusted correctly?
Large output error.
Does the self-
diagnostic indicate the problem
location?
Is transmitter
installed where there is
marked variation in
temperature?
Are excess
capillaries secured?
YES
NO
YES
NO
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
Secure them so that they are not
moved by wind or vibration.
Were appropriate
instruments used for
calibration?
YES
NO