LABEC M-TIT-5 - Manual (Page 45)

c. When pH value stable, press ‘Enter’ Button, the meter displays percentage slope. Now one-point
calibration has finished. Displayed as follows:
Diag. 60 One-point calibration finished slope in starting status
View Titrate Mode Set Calibrate
Press ‘Enter’, meter will ask user if you want to make two-point calibration, displayed as follows:
press ‘Enter’ to make two-point calibration, press ‘Exit’ to stop calibration and meter returns to
starting status. User could stop calibration at anytime by press ‘Exit’ button.
Diag.61 Display of whether making two-point calibration
11.2 Two-Point Calibration
Two-point calibration ensures pH measurement precise, which means the electrode system is
calibrated with two standard solutions to obtain actual percentage slope and Eo value of pH
combination electrode. The operation procedure is as follows:
a. When one-point calibration finished, the meter will ask you if you want to make two-point
calibration, press ‘Enter’ to enter into two-point calibration working status. Take out the electrode,
clean it with distilled water then, put it in pH standard buffer solution C. Meter displays current
pH value and temperature value.
Calibration/one-point calibration
Ca
e librate electrode slop
Titration Panel READY + K 10/21
Enter Exit
Calibration finished!
Electrode slope: 100.0%
Titrate
Enter Clean
Feed
View Titrate Mode Set Calibrate
Calibration/one-point calibration
Calibrate electrode slope
Titration Panel READY + K 10/21
Enter Exit
Two-point calibration?
Titrate
Enter Exit Clean
Feed
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