Thermo Scientific Orion Star
™
and Star Plus Meter User Guide
EN-20
pH Calibration
1 . Prepare the electrode according to the electrode user guide .
2 . In the setup mode, select the buffer set (
or
) that will be used
for the automatic buffer recognition feature .
3 . In the measurement mode, press
until the arrow icon points to the top line,
press
until the
pH
icon is shown and press
to begin the calibration .
4 . Rinse the electrode, and ATC probe if being used, with distilled water and place
into the buffer .
5 . Wait for the
pH
icon to stop flashing .
a . Automatic buffer recognition – When the
pH
icon stops flashing the meter
will display the temperature-corrected pH value for the buffer .
b . Manual calibration – When the
pH
icon stops flashing the meter will display
the actual pH value read by the electrode . Press
until the first digit
to be changed is flashing, press
/
to change the value of the
flashing digit and continue to change the digits until the meter displays the
temperature-corrected pH value of the buffer . Once the pH buffer value is
set, press
until the decimal point is in the correct location .
6 . Press
to proceed to the next calibration point and repeat steps 4 and 5
or press
to save and end the calibration .
7 . The actual electrode slope, in percent, will be displayed in the main field
and
will be displayed in the lower field .
a . For a one point calibration, press
and
/
to edit the slope
and press
to return to the measurement mode .
b . For a two or more point calibration, the meter will automatically proceed
to the measurement mode after the slope is displayed .
pH Technique
Summary of Contents for Orion Star
Page 367: ......
