Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
20
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. The date and time of the last
calibration will be displayed.
5. When READY is displayed next to the reading, indicating electrode
stability, the reading will flash. Press yes. For manual calibration
use or to select the correct value, then press yes to accept each
digit. After accepting each digit, press yes store buffer value. The
meter display freezes for three seconds. The meter automatically
switches to buffer two, indicated by the P2 on the display.
6. Repeat steps 3 through 5 for each buffer.
7. After entering the final buffer value, press measure. The electrode
slope will be displayed. SLP appears in the lower field while the
actual electrode slope, in percent, appears in the main field. After the
third buffer point, the meter automatically displays the calibration
slope and 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. Temperature is displayed in the lower field
when the READY prompt displays.
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