Thermo Orion 410Aplus, Instruction Manual

Page: 28 / 131

pH Calibration Procedure
1. Press 2nd then channel until the correct input channel is selected.
2. Press mode until the pH mode indicator is displayed.
3. Press calibrate . CALIBRATE is displayed. The time and date of the
last calibration are displayed.
4. After a few seconds ENTER NO. BUFFERS is displayed. Enter the
number of buffers; 1 , 2 , or 3 , then press yes .
5. When the BUFFER 1 prompt appears, rinse electrode(s) and place
into first buffer. Wait for a stable display.
6. When the electrode signal has stabilized, the READY CAL AS
prompt will appear. Press yes if the value is correct for your buffer. If
performing a manual calibration, use the numeric keys to change the
value, then press
yes .
7. If more than one buffer was selected, repeat steps 5 and 6 for
each buffer.
8a. If one buffer was selected, the current electrode slope in memory is
displayed at the SLOPE prompt. Press yes , or use numeric keys to
enter correct value, then press yes . If actual slope is unknown, enter
100.0 or perform a two buffer calibration.
8b. If two or more buffers were selected, the average electrode slope is
displayed at the SLOPE prompt.
9. The meter automatically proceeds to MEASURE mode.
10. Rinse electrode(s) and place into sample. Record the pH value when
READY is indicated or when the electrode signal is stable.
Temperature is displayed in the prompt line.
Orion Benchtop pH/ISE Meter Instruction Manual
Calibration and Measurement of pH
24