Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
23
E. Orion 525Aplus pH Calibration and Measurement
Autocalibration
Autocalibration is the feature of the Orion 525Aplus 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 the prompt NO AUTOBUFFER. At this point,
a manual calibration can be performed or the calibration can be ended and
repeated with fresh buffers. 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 to
the READY CAL AS prompt enters the value in memory.
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 manually entered using the numeric
keypad. At the READY ENTER VALUE prompt enter the value for the
buffer and press yes.
Multipoint pH Calibration
Up to a three (3) point calibration can be performed on the Orion 525Aplus
Meter. Both autocalibration and manual calibration may be used within
the same calibration curve. For example autocalibration may be used with
the 7.00 and 10.01 buffers while manual calibration may be used with a
3.78 buffer.
NOTE: If you want to exit this menu, at any time,
press 1st measure.
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