PHscan40
I
4
2 Points Calibration
Ensure 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 distilled 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 electrode slope (e.g., 99%)
and
. Second point calibration is completed.
3 Points Calibration
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 distilled water and place into the pH
4.01 buffer solution, stir the electrode gently. Press the
Enter
key to begin the calibration.
When the reading has stabilized, the
display will automatically show the electrode slope and pH 10.01
/CAL 3.
3.3 Rinse the electrode with distilled water and place into the pH
10.01 buffer solution, stir the electrode gently. Press the
Enter
key to begin the calibration. When the reading has stabilized,
the display will automatically shows the electrode slope and
. 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 make sure the buffer solutions
are fresh and uncontaminated.
•
To exit the calibration without saving calibrated values, press
the
Meas
key.
Measurement
1. Rinse the electrode with distilled water. Place the electrode into
the sample solution and stir gently. Note, the pH-sensitive glass
membrane and liquid junction must be completely immersed into
the solution.
2. If the
option is enabled in the setup menu, the tester will
automatically lock the measurement endpoint and show HOLD
icon. Press the
Meas
key to resume measuring.
If the option is disabled, the tester will continuously measure and
update the readings.
3. Wait for the measurement to stabilize and record the reading.
4. When all of the samples have been measured, rinse the electrode
according to the instructions in the
Electrode Maintenance
.
During the measurement process, if the display shows ---- indicating
the measurement exceeds the range.
