Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
21
D. Orion 520Aplus pH Calibration and Measurement
Autocalibration
Autocalibration is the feature of the Orion 520Aplus 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 and require
operator intervention. 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. Press yes to the READY CAL AS prompt to
enter 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 that the buffer values are manually entered using the
numeric keypad. At the “READY CAL AS” prompt enter the value for the
buffer and press yes to enter.
Three Point pH Calibration
Up to a three (3) point calibration can be performed on the Orion 520Aplus
Meter. Both autocalibration and manual calibrations 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 would be used with a 3.78
buffer.
To Next Page
Loading...
Need help?
General
