PHscan40
2 Points Calibration
Make sure that you have selected 2 points calibration in the setup menu.
2.1 Repeat steps 1.1 through 1.3 above. When the first calibration point is completed, the display will show "----/CAL 2", the tester prompts
you to continue with second point calibration.
2.2 Rinse the electrode with deionized water and place into the pH
4.01 or 10.01 buffer solution. Stir the electrode gently.
2.3 Press the
Enter
key, the tester automatically recognizes the buffer solution and begins calibration. When the reading has stabilized, the
display automatically shows the pH slope (e.g., 99%) and "End". Second point calibration is completed.
3 Points Calibration
Make sure that you have selected 3 points calibration in the setup menu.
3.1 Repeat steps 1.1 through 1.3 above. When the first calibration point is completed, the display will show "pH
4.01/CAL 2", the tester prompts
you to continue with second point calibration.
3.2 Rinse the electrode with deionized water and place into the pH
4.01 buffer solution. Stir the electrode gently.
3.3 Press the
Enter
key to begin the calibration. When the reading has stabilized, the display will show the pH slope and "pH
10.01/CAL 3".
3.4 Rinse the electrode with deionized water and place into the pH
10.01 buffer solution. Stir the electrode gently. When the reading has
stabilized, the display automatically shows the pH slope and "End". Calibration is completed.
•
During the calibration, if the display shows
indicating that the measured mV value for the current calibration point deviates by more
than 60
mV (approximately ± 1
pH) from the theoretical value of the pH buffer. The calibration will not be accepted. Please check the
electrode and ensure the buffer solutions are fresh and uncontaminated.
•
To exit the calibration without saving calibrated values, press the
Meas
key.
Measurement
Rinse the electrode with deionized water. Place the electrode into the sample solution and stir gently. Note that the end of the electrode must be
completely immersed into the solution. Wait for the measurement to stabilize and record the reading.
•
During the measurement, never wipe the pH-sensitive glass membrane as this will cause static interference, blot dry with a lint-free tissue
to remove waterdrops on electrode.
•
If the display shows "----" indicating the measurement exceeds the range, remove the electrode from the sample immediately.
•
If the
option is enabled in the setup menu, the tester will automatically lock a measurement endpoint and show
icon.
Press the
Meas
key to resume measuring.
