YOKOGAWA FC400G, User Manual, Page: 69 / 91

< 7. Calibration >
7-8
IM 12F5A1-01E
(7) Press the
YES
key to end the calibration and switch the FC400G to the MEAS mode.
Press the
YES
key to switch the FC400G to the <MEASURE> or <HOLD> mode (“HOLD.
ON” in the message display). When “HOLD.ON” is displayed, press the
NO
key to select the
<MEASURE> mode.
7.4 Remedies When Errors Occur in Zero or Span
Calibration
7.4.1 If Errors occur during Calibration
If error occurs during zero or span calibration, the FC400G free available chlorine analyzer displays
FAIL on the LCD and generates an error message as follows:
(1) During Zero Calibration
“END.E6” : Zero point error (Err.6)
“END.E7” : Response error during the calibration (Err.7)
(2) During Span Calibration
“END.E5” : Slope error (Err.5)
“END.E7” : Response error during the calibration (Err.7)
Note : If multiple errors occur, the error with the highest priority appears.
Priority is Err.5 > Err.6 > Err.7.
7.4.2 Remedies When an Error Occurs
(1) Press the
NO
key to perform calibration again and confirm that the error does not occur again.
(2) If the error occurs again, refer to Sec. 9.1 and remove the cause of the error, and then perform
calibration.
Note: When an error occurs, the concentration value based on the calibration data is displayed. Also, the error message and “FALL”
remain displayed in the <MEASURE> mode. These indications will not disappear unless the cause is removed.
NOTE
Slope error (Err.5) generated when span calibration is performed using manual analysis
except the amperometric titration (AT) method
Initial electrode sensitivity (set at the time of shipment) is established based on the AT method. When
span calibration is performed based on a manual analysis method (such as OT or DPD method)
other than the AT method, a slope error [END.E5 (Err.5)] may occur due to the difference between
the detecting sensitivity of the AT method and that of another method. In that case, initialize electrode
sensitivity and perform span calibration.
If no error occurs during manual analysis other than the AT method, there is no practical problem even
when the initial sensitivity set at the time of shipment is not changed.
Note: To initialize the electrode sensitivity, set service code 08 to “1” for “initialize electrode sensitivity” before performing calibration
[refer to Sec. 5.4.2(f)].