Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
26
pH Calibration Procedure
1. Connect electrode(s) to meter. Choose buffers that will bracket the
expected sample pH.
2. Press mode until the pH mode indicator is displayed.
3. Rinse electrode(s) and place into buffer.
4. Press 2nd then cal to begin calibration. CALIBRATE is displayed
above the main field. The date and time of the last calibration will
be displayed.
5. When the electrode is stable, the READY prompt will be displayed
and the temperature corrected value for the buffer is displayed. Press
yes. If performing a manual calibration, press or to change the
value, then press yes. The buffer value is stored and meter display
freezes for three seconds. The meter automatically switches to buffer
two, indicated by the “P2” on the display in the lower field.
6. Repeat steps 3 and 5 for each buffer.
7. After the buffer value for the last buffer has been entered, the
electrode slope will be displayed automatically. If doing a manual
calibration or less than a 5 point autocalibration, press measure. SLP
appears in the lower field while the actual electrode slope, in percent,
appears in the main field. The meter automatically advances to the
measure mode. MEASURE is displayed above the main field.
8. Rinse electrode(s) and place into sample. Record pH directly from the
main meter display when the READY prompt displays. Temperature
is displayed in the lower field.
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