YOKOGAWA FC400G

< 9. Troubleshooting >
9-2
IM 12F5A1-01E
Err.1:(Di󰀨usionCurrentValueExceeded)
“Err.1”appearsifthedi󰀨usioncurrentduringmeasurementexceedstherangeof-9.00to26.00µA.
Conrmiftheappliedvoltageparametervaluesetinservicecode07iscorrect.Also,conrm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.
Conrm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conrmed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.
Conrm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conrmed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.
Conrm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.
Conrmresponserecoveryaftertheindicatorelectrodehasbeenpolishedusingalumina.Also,
conrm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.