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< 12. Troubleshooting >
12-3
IM 11M12D01-01E
12.1.4 Remedies When an Error Occurs
1) Error 1: Cell Voltage Failure
Error 1 occurs when the cell (sensor) voltage input to the converter falls below -50 mV (corresponding
to about 200% O
2
). The following are considered to be the causes for the cell voltage falling below -50
mV:
(1) Poor contact in terminal connections between the converter and detector
(2) Breakage in wiring cable between the converter and the detector
(3) Damage or deterioration of the sensor assembly
(4) Continuity failure between the sensor assembly electrode and the contact
(5) Wiring failure inside the detector
(6) Abnormality in electrical circuits in the converter
<Locating the failure and countermeasures>
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
Is there any
breakage or poor contact
in the wiring to the converter
terminals?
Is there any
breakage or poor contact
in the wiring to the detector
terminals?
Is the sensor
extremely dirty, corroded
or broken?
Is there
any disconnection or poor
continuity in the wiring between
the detector and
converter?
Is an error indicated
on the display?
End. Carry out calibration.
Replace the damaged
portions.
Examine the wiring connection to converter terminals
"CELL+" and "CELL-" Also, check the wiring
connection in the repeater terminal box if it is used.
Examine the wiring connection status to
detector terminals 1 and 2.
Also, check that terminals and cable
conductors are not corroded.
Replace the damaged
portions.
Remove the sensor assembly from the detector
and check for the presence of corrosion that may
cause a poor contact between the electrode and
the contact; also, check for dirt. A sensor assembly
in which no abnormality is found may be used again.
However, be sure to use a new metal O-ring and
contact even in such a case.
Replace the sensor
assembly.
See Subsection 11.3.3.
Remove the wiring conductors from detector
terminals 1 and 2 and short out the removed
conductors. Measure the resistance of these
wiring conductors on the converter side.
The resistance value is normal if it indicates
10 Ω or less.
Replace the wiring cable.
Turn on the power to the converter and temporarily
place the analyzer in the operating status.
Replace the sensor
assembly and temporarily
place the analyzer in the
operating status.
See Subsection 11.3.3.
The analyzer operates
normally.
F12-5E.ai
Turn off power to the channel with error
by hot swap function or to the averaging converter.
A failure in the detector or
the converter is suspected.
Contact Yokogawa.
Figure 12.5
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