OHAUS AB23PH - Perform 2-Point Calibration; Perform 3-Point Calibration

AB23PH Bench pH Meter EN-11
4.1.2.2 1-point calibration
When the meter is in pH measurement mode, place the pH electrode in a calibration
buffer, stir 5 seconds, and wait for 30 seconds, then:
1 Press the Cal button. and appear on the top of the screen, and both are
blinking during calibration.
Note:
a) Calibration starts with the Auto End Point Mode.
b) Pressing the Auto-Stop button during the calibration can end the process.
2 The meter reaches endpoint automatically according to the preselected auto-
endpoint mode. The screen will display the calibration point pH value (e.g. 7.00)
with the temperature. The calibrated buffer value in the buffer group will be marked
in .
The 1-point calibration is finished. There are now 3 options (OHAUS recommends
conducting at least a 2 point calibration).
1. Press the Cal button to perform the 2-point calibration.
2. Press the Store button to store the 1-point calibration and exit, the offset and the
slope are shown on the display for 3 seconds then return to the measurement
screen.
3. Press the Exit button to reject the calibration, return to the measurement screen.
4.1.3 Perform 2-point calibration
After finishing the 1-point calibration as described above:
1 Rinse the pH electrode with pure water and wipe off with tissue.
2 Place the electrode in the next calibration buffer, stir and wait for 30 seconds.
3 Press the Cal button. and appear on the top of the screen, and both are
blinking during calibration.
Note:
a) Calibration starts with the Auto End Point Mode.
b) Pressing the Auto-Stop button during the calibration can end the process.
4 The meter reaches endpoint automatically according to the preselected auto-
endpoint mode. The screen will display the calibration point pH value (e.g. 7.00)
with the temperature. The second calibrated buffer value in the buffer group will be
marked in .
You have the same options after the 2-point calibration as the 1-point calibration. Please
check 1-point calibration section for details.
4.1.4 Perform 3-point calibration
Repeat the steps for performing a 2-point calibration to perform a 3-point calibration
using a third buffer.