Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
25
F. Orion 710Aplus pH Calibration and Measurement
Autocalibration
Autocalibration is the feature of the Orion 710Aplus Meter that
automatically recognizes five buffers, 1.68, 4.01, 7.00, 10.01, and 12.46,
within a range of ± 0.5 pH units. Results greater than ± 0.5 pH units from
the correct value will trigger an operator assistance code. During
calibration, the user waits for a stable pH reading. Once the electrode is
stable, the meter automatically recognizes and displays the temperature
corrected value for that buffer. Pressing yes enters the value in memory.
NOTE: Do not scroll when using autocalibration. If you
want to exit this menu at any time, press measure.
Manual Calibration
To calibrate with buffers other than 1.68, 4.01, 7.00, 10.01, or 12.46, use
the manual calibration technique. The calibration sequence is the same as
autocalibration except buffer values are scrolled in and then entered.
NOTE: For manual calibration, you must use the scroll
or keys. Even if the value displayed is the correct
value for your buffer you must press a scroll key to
start the editing process. Press yes to accept each
digit. Otherwise, the meter assumes autocalibration is
being performed.
Multipoint pH Calibration
Up to a five (5) point calibration can be performed on the Orion 710Aplus
Meter. Both autocalibration and manual calibration may be used within the
same calibration curve. For example, autocalibration may be used with the
1.68, 7.00, and 10.01 buffers while manual calibration may be used with
3.78 and 9.18 buffers.
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