Orion Benchtop pH/ISE Meter Instruction Manual
Automatic Blank Correction
121
When blank correction is implemented, the slope value for the electrode
may be outside the range of values normally considered acceptable during
an ordinary calibration. For best results calibration standards should be
close in range to the expected sample concentrations and should bracket
the expected sample concentration.
When conditions 1, 2, and 3 above are not met, the calibration data is
handled by the multipoint calibration method described earlier.
NOTE: When a calibration standard is defined as zero
and the meter cannot calculate a blank, the operator
assistance code E-32 will be displayed. See
Troubleshooting section.
In calibrations with more than three points, a combination of methods are
utilized. Automatic blank correction is used if the lowest three points satisfy
the criteria and multipoint calibration is used for the other points. The
slope displayed after calibration is an average of the slope calculated in
the automatic blank correction algorithm and the slope(s) for each
additional segment.
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