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3.8 Error Codes
4. CAL 3 Immerse the electrode(s) in the third buffer solution and allow the instrument to stabilise.
When no change in the least significant display digit is detected over a five second period the
endpoint symbol will be displayed. Press the CAL or STO key.
If a successful I point calibration has been performed the secondary display will momentarily show
CAL OK. The slope value from the calibration will be displayed. The instrument will then update the
display.
Rinse the electrode(s) in deionised water.
If the instrument fails a calibration the error message EO will be shown and ERROR SLOPE
OUTSIDE LIMITS will scroll along the secondary display.
351 050/REV B/09-06
ERROR EO OUTSIDE LIMITS
This error message will be displayed when the mV value for a buffer is more or less than 30mV
from the ideal Nernstian value.
ERROR SLOPE OUTSIDE LIMITS
This error message is displayed when the slope value is outside the range of 75 - 125%.
UNABLE TO RECOGNISE BUFFER
This error message will be displayed when the buffer value is more than 0.5 pH units from the set
value.
