Thermo Orion 410Aplus, Instruction Manual

Page: 22 / 131

Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
18
pH Calibration Procedure
1. Connect electrode(s) to meter. Choose buffers that will bracket the
expected sample pH.
2. Rinse electrode(s) and place into buffer.
3. Press mode until CALIBRATE is displayed.
4. The last buffer sequence used will be displayed. Press yes to use this
sequence or no to scroll through choices.
5. Buffer indicator along bottom of the display will indicate the buffer
chosen. P1 will be displayed in lower display field and buffer reading
will be displayed in the main field. When READY is displayed,
indicating electrode stability, press
yes to accept the displayed value.
If performing a manual calibration, press no to change each digit until
the correct pH value is displayed then press yes to accept.
6. The temperature corrected value for that buffer is automatically
entered into the memory of the meter. P2 will be displayed in the
lower display field indicating the meter is ready for the second buffer.
The buffer indicator along the bottom of the display will indicate the
second buffer of the calibration sequence selected.
7. Repeat steps 2 and 5 for each buffer.
8. After the buffer value for the last buffer has been entered, 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. Press
yes , the meter will automatically advance to the
measure mode. MEASURE is displayed above the main field.
9. Rinse electrode(s) and place into sample. Record pH directly from the
main meter display when READY is displayed. Temperature is
displayed in the lower field.