Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
17
B. Orion 410Aplus pH Calibration and Measurement
Autocalibration
Autocalibration is a feature of the Orion 410Aplus Meter that automatically
recognizes the standard buffers, 4.01, 7.00 and 10.01, within a range of
± 0.5 pH units. Simply select the buffer sequence that best fits your
application. Results greater than ± 0.5 pH units from the theoretical 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 into memory.
Manual Calibration
To calibrate with buffers other than 4.01, 7.00, or 10.01, use the manual
calibration technique. The chosen buffers must be greater than one (1) pH
unit but less than four (4) pH units from the next closest buffer. Manual
calibration is selected through SETUP mode. The calibration sequence is
the same as autocalibration except that the buffer values are scrolled in and
then entered.
NOTE: For manual calibration use yes to accept or no
to change each digit until the correct value, then press
yes to accept.
Three Point pH Calibration
Up to a three (3) point calibration can be performed on the Orion 410Aplus
Meter. Simply select the buffer sequence that best fits your application.
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