15
Thermo Scientific Orion Star A214 Benchtop and Star A324 Portable pH/ISE Meter Reference Guide
Chapter 4 pH, RmV and ORP Calibration
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pH Calibration
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sample pH and are one to four pH units apart. Prepare the pH electrode according to the instructions in the electrode
use guide. Connect the pH electrode and any other electrodes to be used (stirrer probe, ATC probe, reference
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Note: In most calibration screens, press
f1 (esc)
to return to the measurement mode without saving the calibration.
1. In the measurement mode, press
f1 (cal)
.
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into the pH buffer.
3. When the electrode and buffer are ready, press
f3 (start)
. If using a Star A214 benchtop meter and stirrer probe, the
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f3 (start)
is pressed and
stop stirring once the reading stabilizes.
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a. Press
f2 (accept)
to accept the displayed value.
b. Press
f3 (edit)
to access the numeric entry screen and edit the value.
i. Press
,
,
or
to highlight a number, decimal point or negative sign; press
f3 (enter)
to select the highlighted item and repeat until the value at the measured temperature is
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ii. Press
f2 (done)
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iii. Press
f2 (accept)
to accept the entered value.
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f2 (next)
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press
f3 (cal done)
to save and end
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a. If a one point calibration is performed, press
f2 (accept)
to accept the displayed slope value or press
f3 (edit)
to access the numeric entry screen, enter the slope value and press
f2 (accept)
.
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f1 (meas)
to proceed to the measurement mode or press
f2 (print)
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data to a printer or computer.
