Chapter 4 Ph, Rmv And Orp Calibration; Ph Calibration - Thermo Scientific Orion Star A211 Reference Manual

Chapter 4 pH, RmV and ORP Calibration

pH Calibration

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 electrode) to the
Note: In most calibration screens, press f1 (esc) to return to the measurement mode without saving the calibration.
into the pH buffer.
3. When the electrode and buffer are ready, press f3 (start)
stirring once the reading stabilizes.
a. Press f2 (accept) to accept the displayed value.
b. Press f3 (edit) to access the numeric entry screen and edit the value.
f2 (next)
f1 (meas) to proceed to the measurement mode or press f2 (print)
to a printer or computer.
Thermo Scientific Orion Star A211 Benchtop and Star A221 and Star A321 Portable pH Meter Reference Guide
f1 (cal).
i. Press , , or
f3 (enter) to select the highlighted item and repeat until the value at the measured temperature is
ii. Press f2 (done)
iii. Press f2 (accept) to accept the entered value.
f3 (edit) to access the numeric entry screen, enter the slope value and press f2 (accept).
to highlight a number, decimal point or negative sign; press
f2 (accept) to accept the displayed slope value or press
f3 (start) is pressed and stop
press f3 (cal done) to save and end
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