YOKOGAWA FC400G, User Manual, Page: 81 / 91

< 9. Troubleshooting >
9-2
IM 12F5A1-01E
Err. 1: (Diffusion Current Value Exceeded)
“Err. 1” appears if the diffusion current during measurement exceeds the range of -9.00 to 26.00 µA.
Confirm if the applied voltage parameter value set in service code 07 is correct. Also, confirm that
there is no grime or moisture adhesion resulting in insulation deterioration on the electrode cable
connection.
Err. 2: (Sample Temperature Error)
“Err. 2” appears if sample temperature exceeds the range of 0.0 to 50.0°C.
Control sample temperature to be in the range of 0.0 to 50.0°C.
If the error indication fails to extinguish even when the sample temperature is in the range of 0.0 to
50.0 °C, RTD is possibly defective (open circuited). In this case, replace the counter electrode.
Err. 4: (Applied Voltage Error)
“Err. 4” appears if the applied voltage output exceeds the range of -1.5 to 1.5 V.
Confirm if the applied voltage parameter value set in service code 07 is correct.
Err. 5: (Slope Error)
“Err. 5” appears if the initial sensitivity value ( value set to initialize electrode sensitivity in service
code 08) exceeds the range of 50 to 120% when the slope is confirmed during calculation in span
calibration.
The calibration standard solution used for span calibration may have aged, entering the incorrect
concentration value, or the indicator electrode may have deteriorated.
Confirm the presence of any of these.
If the error still fails to extinguish even when re-calibration is made using a new calibration
standard
solution or after the indicator electrode has been polished using alumina, the indicator electrode must
be replaced.
Err. 6: (Zero Point Error)
“Err. 6” appears if the zero point exceeds ± 1.00 µA when the zero point is confirmed during calculation
in zero calibration.
Chlorine may enter the chlorine-free water used for the calibration (when the chlorine-free-water-
based measuring method applies), or the indicator electrode or counter electrode may be defective.
Confirm if any of these is the cause.
Err. 7: (Response Error during Zero and / or Span Calibration)
“Err. 7” appears if concentration does not stabilize within “*CT. min” (stabilization setup time) set in
service code 04 during zero and / or span calibration.
Confirm response recovery after the indicator electrode has been polished using alumina. Also,
confirm that the set values of stability determination parameters “*ΔT. SEC”, “ *ΔPPM ”, and “*CT.min”
set in service code 04 are correct. If the parameters are correct, but still no response recovery, the
indicator electrode may have deteriorated.
Replace the indicator electrode.
Err. 8: (Temperature Compensation Range Exceeded)
“Err. 8” appears if sample temperature exceeds the temperature compensation range of 0.0 to 40.0 °C.
Control sample temperature to be in the range of 0.0 to 40.0°C.
Note: Exceeded temperature compensation range check is available only when temperature compensation range fail ON is selected in
service code 02.